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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Uri Lublin <uril@redhat.com>
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Date: Mon, 2 Feb 2015 12:35:59 +0200
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Subject: [PATCH] char-device: spice_char_device_write_to_device: protect
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against recursion
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This fixes Spice's smart card support and is related to
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commit 697f3214fd16adcd524456003619f7f44ddd031b.
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Reported-by: Swapna Krishnan <skrishna@redhat.com>
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Recursion is now possible starting with spice_char_device_write_to_device
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going through spice_char_device_wakeup (after going through qemu),
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calling again to spice_char_device_write_to_device.
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The protecting code is the same as the one protecting the read path.
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This function call loop makes the program to abort with the following messages:
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usb-ccid: chardev: unexpected message of type 3000000
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qemu: qemu_mutex_lock: Resource deadlock avoided
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Backtrace:
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(gdb) bt
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* #0 0x00007ffff3fc78c7 in raise () from /lib64/libc.so.6
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* #1 0x00007ffff3fc952a in abort () from /lib64/libc.so.6
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* #2 0x0000555555969a95 in error_exit (err=35,
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* msg=0x5555559f8c90 <__func__.5119> "qemu_mutex_lock")
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* at util/qemu-thread-posix.c:48
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* #3 0x0000555555969b82 in qemu_mutex_lock (mutex=0x5555562c4d60)
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* at util/qemu-thread-posix.c:79
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* #4 0x0000555555714771 in qemu_chr_fe_write (s=0x5555562c4d60,
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* buf=0x7fffffffd2a0 "", len=12) at qemu-char.c:219
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* #5 0x000055555586be49 in ccid_card_vscard_send_msg (s=0x5555565c5f80,
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* type=VSC_Error, reader_id=0, payload=0x7fffffffd2e0 "", length=4)
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* at hw/usb/ccid-card-passthru.c:75
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* #6 0x000055555586bf00 in ccid_card_vscard_send_error (s=0x5555565c5f80,
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* reader_id=0, code=VSC_GENERAL_ERROR) at
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* hw/usb/ccid-card-passthru.c:91
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* #7 0x000055555586c559 in ccid_card_vscard_handle_message (
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* card=0x5555565c5f80, scr_msg_header=0x5555565c6008)
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* at hw/usb/ccid-card-passthru.c:254
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* #8 0x000055555586c72f in ccid_card_vscard_read (opaque=0x5555565c5f80,
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* buf=0x5555565034b0 "", size=12) at hw/usb/ccid-card-passthru.c:289
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* #9 0x00005555557149db in qemu_chr_be_write (s=0x5555562c4d60,
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* buf=0x5555565034b0 "", len=12) at qemu-char.c:305
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* #10 0x000055555571cde5 in vmc_write (sin=0x5555562c4e78,
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* buf=0x5555565034b0 "", len=12) at spice-qemu-char.c:41
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* #11 0x00007ffff4fa86aa in spice_char_device_write_to_device (
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* dev=0x55555657f210) at char_device.c:462
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* #12 0x00007ffff4fa9b48 in spice_char_device_wakeup (dev=0x55555657f210)
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* at char_device.c:862
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* #13 0x00007ffff4ff7658 in spice_server_char_device_wakeup
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* (sin=0x5555562c4e78) at reds.c:2955
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* #14 0x000055555571d1d2 in spice_chr_write (chr=0x5555562c4d60,
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* buf=0x7fffffffd560 "", len=12) at spice-qemu-char.c:189
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* #15 0x0000555555714789 in qemu_chr_fe_write (s=0x5555562c4d60,
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* buf=0x7fffffffd560 "", len=12) at qemu-char.c:220
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* #16 0x000055555586be49 in ccid_card_vscard_send_msg (s=0x5555565c5f80,
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* type=VSC_Error, reader_id=0, payload=0x7fffffffd5a0 "", length=4)
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* at hw/usb/ccid-card-passthru.c:75
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* #17 0x000055555586bf00 in ccid_card_vscard_send_error
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* (s=0x5555565c5f80,
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* reader_id=0, code=VSC_SUCCESS) at hw/usb/ccid-card-passthru.c:91
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* #18 0x000055555586c4fc in ccid_card_vscard_handle_message (
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* card=0x5555565c5f80, scr_msg_header=0x5555565c6008)
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* at hw/usb/ccid-card-passthru.c:242
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* #19 0x000055555586c72f in ccid_card_vscard_read (opaque=0x5555565c5f80,
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* buf=0x5555565034b0 "", size=12) at hw/usb/ccid-card-passthru.c:289
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* #20 0x00005555557149db in qemu_chr_be_write (s=0x5555562c4d60,
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* buf=0x5555565034b0 "", len=12) at qemu-char.c:305
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* #21 0x000055555571cde5 in vmc_write (sin=0x5555562c4e78,
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* buf=0x5555565034b0 "", len=12) at spice-qemu-char.c:41
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* #22 0x00007ffff4fa86aa in spice_char_device_write_to_device (
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* dev=0x55555657f210) at char_device.c:462
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* #23 0x00007ffff4fa8d37 in spice_char_device_write_buffer_add (
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* dev=0x55555657f210, write_buf=0x555556501f70) at char_device.c:597
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* #24 0x00007ffff501142d in smartcard_channel_write_to_reader (
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* write_buf=0x555556501f70) at smartcard.c:669
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* #25 0x00007ffff501034c in smartcard_char_device_notify_reader_add (
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* st=0x55555657ef00) at smartcard.c:335
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e2c81d |
* #26 0x00007ffff50112b3 in smartcard_add_reader (scc=0x555556493ee0,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* name=0x5555565023cc "E-Gate 0 0") at smartcard.c:642
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #27 0x00007ffff50118d2 in smartcard_channel_handle_message (
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* rcc=0x555556493ee0, type=101, size=22, msg=0x5555565023c0 "\003")
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* at smartcard.c:757
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #28 0x00007ffff4fbc168 in red_peer_handle_incoming
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* (stream=0x555556588250, handler=0x555556497ff0) at red_channel.c:308
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #29 0x00007ffff4fbc231 in red_channel_client_receive
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* (rcc=0x555556493ee0) at red_channel.c:326
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #30 0x00007ffff4fc0019 in red_channel_client_event (fd=59, event=1,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* data=0x555556493ee0) at red_channel.c:1574
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #31 0x00005555558b6076 in watch_read (opaque=0x5555565002f0)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* at ui/spice-core.c:101
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #32 0x00005555558e8d48 in qemu_iohandler_poll (pollfds=0x5555562b7630,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* ret=2) at iohandler.c:143
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #33 0x00005555558e89a4 in main_loop_wait (nonblocking=0) at
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* main-loop.c:495
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #34 0x00005555557219b0 in main_loop () at vl.c:1794
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* #35 0x0000555555729257 in main (argc=40, argv=0x7fffffffddc8,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
* envp=0x7fffffffdf10) at vl.c:4350
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
(cherry picked from commit 0c1f5b00e7907aefee13f86a234558f00cd6c7ef)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
---
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
server/char_device.c | 12 ++++++++++++
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
1 file changed, 12 insertions(+)
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e2c81d |
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e2c81d |
diff --git a/server/char_device.c b/server/char_device.c
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
index 285299c..e5d7c69 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
--- a/server/char_device.c
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+++ b/server/char_device.c
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
@@ -64,6 +64,7 @@ struct SpiceCharDeviceState {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
SpiceCharDeviceInstance *sin;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
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e2c81d |
int during_read_from_device;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ int during_write_to_device;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
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e2c81d |
SpiceCharDeviceCallbacks cbs;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
void *opaque;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
@@ -441,6 +442,11 @@ static int spice_char_device_write_to_device(SpiceCharDeviceState *dev)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
return 0;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
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e2c81d |
+ /* protect against recursion with spice_char_device_wakeup */
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e2c81d |
+ if (dev->during_write_to_device++ > 0) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ return 0;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ }
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e2c81d |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
spice_char_device_state_ref(dev);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
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e2c81d |
if (dev->write_to_dev_timer) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
@@ -465,6 +471,11 @@ static int spice_char_device_write_to_device(SpiceCharDeviceState *dev)
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e2c81d |
dev->cur_write_buf_pos;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
n = sif->write(dev->sin, dev->cur_write_buf_pos, write_len);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
if (n <= 0) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ if (dev->during_write_to_device > 1) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ dev->during_write_to_device = 1;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ continue; /* a wakeup might have been called during the write -
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ make sure it doesn't get lost */
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
+ }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
break;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
total += n;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
@@ -489,6 +500,7 @@ static int spice_char_device_write_to_device(SpiceCharDeviceState *dev)
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}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
dev->active = dev->active || total;
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e2c81d |
}
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e2c81d |
+ dev->during_write_to_device = 0;
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e2c81d |
spice_char_device_state_unref(dev);
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e2c81d |
return total;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e2c81d |
}
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