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From 32957eca8129f926d205310ee7efbc1168e8ebdc Mon Sep 17 00:00:00 2001
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Message-Id: <32957eca8129f926d205310ee7efbc1168e8ebdc@dist-git>
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From: Marc Hartmayer <mhartmay@linux.ibm.com>
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Date: Thu, 8 Oct 2020 11:07:00 -0400
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Subject: [PATCH] udevProcessCSS: Check if def->driver is non-NULL
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Don't process subchannel devices where `def->driver` is not set. This
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fixes the following segfault:
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Thread 21 "nodedev-init" received signal SIGSEGV, Segmentation fault.
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[Switching to Thread 0x3ffb08fc910 (LWP 64303)]
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(gdb) bt
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#0 0x000003fffd1272b4 in __strcmp_vx () at /lib64/libc.so.6
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#1 0x000003ffc260c3a8 in udevProcessCSS (device=0x3ff9018d130, def=0x3ff90194a90)
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#2 0x000003ffc260cb78 in udevGetDeviceDetails (device=0x3ff9018d130, def=0x3ff90194a90)
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#3 0x000003ffc260d126 in udevAddOneDevice (device=0x3ff9018d130)
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#4 0x000003ffc260d414 in udevProcessDeviceListEntry (udev=0x3ffa810d800, list_entry=0x3ff90001990)
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#5 0x000003ffc260d638 in udevEnumerateDevices (udev=0x3ffa810d800)
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#6 0x000003ffc260e08e in nodeStateInitializeEnumerate (opaque=0x3ffa810d800)
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#7 0x000003fffdaa14b6 in virThreadHelper (data=0x3ffa810df00)
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#8 0x000003fffc309ed6 in start_thread ()
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#9 0x000003fffd185e66 in thread_start ()
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(gdb) p *def
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$2 = {
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name = 0x0,
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sysfs_path = 0x3ff90198e80 "/sys/devices/css0/0.0.ff40",
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parent = 0x0,
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parent_sysfs_path = 0x0,
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parent_wwnn = 0x0,
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parent_wwpn = 0x0,
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parent_fabric_wwn = 0x0,
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driver = 0x0,
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devnode = 0x0,
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devlinks = 0x3ff90194670,
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caps = 0x3ff90194380
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}
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Fixes: 05e6cdafa6e0 ("node_device: detect CSS devices")
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Reviewed-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
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Reviewed-by: Erik Skultety <eskultet@redhat.com>
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Signed-off-by: Marc Hartmayer <mhartmay@linux.ibm.com>
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(cherry picked from commit cb09344a2cccc0cc9bcefa3cb53d7af45ba92631)
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https://bugzilla.redhat.com/show_bug.cgi?id=1853289
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https://bugzilla.redhat.com/show_bug.cgi?id=1865932
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Message-Id: <20201008150700.52157-6-bfiuczyn@redhat.com>
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Reviewed-by: Erik Skultety <eskultet@redhat.com>
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---
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src/node_device/node_device_udev.c | 5 +++--
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1 file changed, 3 insertions(+), 2 deletions(-)
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diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
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index b6b28bc35a..88cf1edf50 100644
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--- a/src/node_device/node_device_udev.c
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+++ b/src/node_device/node_device_udev.c
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@@ -1130,8 +1130,9 @@ udevProcessCSS(struct udev_device *device,
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virNodeDeviceDefPtr def)
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{
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/* only process IO subchannel and vfio-ccw devices to keep the list sane */
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- if (STRNEQ(def->driver, "io_subchannel") &&
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- STRNEQ(def->driver, "vfio_ccw"))
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+ if (!def->driver ||
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+ (STRNEQ(def->driver, "io_subchannel") &&
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+ STRNEQ(def->driver, "vfio_ccw")))
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return -1;
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if (udevGetCCWAddress(def->sysfs_path, &def->caps->data) < 0)
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--
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2.28.0
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