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From 7940a4b551e845a34409ad79a6250c5ea2f97df6 Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Fri, 11 Jul 2014 14:21:10 +0200
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Subject: [PATCH 30/43] usb: initialize libusb_device to avoid crash
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Message-id: <1405088470-24115-38-git-send-email-kraxel@redhat.com>
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Patchwork-id: 59842
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O-Subject: [RHEL-7.1 qemu-kvm PATCH 37/37] usb: initialize libusb_device to avoid crash
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Bugzilla: 1111450
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RH-Acked-by: Dr. David Alan Gilbert (git) <dgilbert@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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From: Jincheng Miao <jmiao@redhat.com>
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If libusb_get_device_list() fails, the uninitialized local variable
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libusb_device would be passed to libusb_free_device_list(), that
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will cause a crash, like:
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(gdb) bt
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#0 0x00007fbbb4bafc10 in pthread_mutex_lock () from /lib64/libpthread.so.0
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#1 0x00007fbbb233e653 in libusb_unref_device (dev=0x6275682d627375)
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at core.c:902
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#2 0x00007fbbb233e739 in libusb_free_device_list (list=0x7fbbb6e8436e,
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unref_devices=<optimized out>) at core.c:653
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#3 0x00007fbbb6cd80a4 in usb_host_auto_check (unused=unused@entry=0x0)
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at hw/usb/host-libusb.c:1446
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#4 0x00007fbbb6cd8525 in usb_host_initfn (udev=0x7fbbbd3c5670)
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at hw/usb/host-libusb.c:912
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#5 0x00007fbbb6cc123b in usb_device_init (dev=0x7fbbbd3c5670)
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at hw/usb/bus.c:106
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...
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So initialize libusb_device at the begin time.
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Signed-off-by: Jincheng Miao <jmiao@redhat.com>
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Reviewed-by: Gonglei <arei.gonglei@huawei.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit 3ce21445387c64032a21ae73c995195307a28a36)
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---
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hw/usb/host-libusb.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/host-libusb.c | 4 ++--
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1 file changed, 2 insertions(+), 2 deletions(-)
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diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
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index 8510902..ef3dd5f 100644
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--- a/hw/usb/host-libusb.c
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+++ b/hw/usb/host-libusb.c
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@@ -1384,7 +1384,7 @@ static void usb_host_auto_check(void *unused)
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{
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struct USBHostDevice *s;
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struct USBAutoFilter *f;
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- libusb_device **devs;
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+ libusb_device **devs = NULL;
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struct libusb_device_descriptor ddesc;
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int unconnected = 0;
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int i, n;
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@@ -1485,7 +1485,7 @@ static void usb_host_auto_check(void *unused)
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void usb_host_info(Monitor *mon, const QDict *qdict)
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{
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- libusb_device **devs;
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+ libusb_device **devs = NULL;
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struct libusb_device_descriptor ddesc;
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char port[16];
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int i, n;
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--
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1.8.3.1
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