[PATCH] udevProcessCSS: fix segfault
Don't process subchannel devices where `def->driver` is not set. This
fixes the following segfault:
Thread 21 "nodedev-init" received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0x3ffb08fc910 (LWP 64303)]
(gdb) bt
#0 0x000003fffd1272b4 in __strcmp_vx () at /lib64/libc.so.6
#1 0x000003ffc260c3a8 in udevProcessCSS (device=0x3ff9018d130, def=0x3ff90194a90)
#2 0x000003ffc260cb78 in udevGetDeviceDetails (device=0x3ff9018d130, def=0x3ff90194a90)
#3 0x000003ffc260d126 in udevAddOneDevice (device=0x3ff9018d130)
#4 0x000003ffc260d414 in udevProcessDeviceListEntry (udev=0x3ffa810d800,
list_entry=0x3ff90001990)
#5 0x000003ffc260d638 in udevEnumerateDevices (udev=0x3ffa810d800)
#6 0x000003ffc260e08e in nodeStateInitializeEnumerate (opaque=0x3ffa810d800)
#7 0x000003fffdaa14b6 in virThreadHelper (data=0x3ffa810df00)
#8 0x000003fffc309ed6 in start_thread ()
#9 0x000003fffd185e66 in thread_start ()
(gdb) p *def
$2 = {
name = 0x0,
sysfs_path = 0x3ff90198e80 "/sys/devices/css0/0.0.ff40",
parent = 0x0,
parent_sysfs_path = 0x0,
parent_wwnn = 0x0,
parent_wwpn = 0x0,
parent_fabric_wwn = 0x0,
driver = 0x0,
devnode = 0x0,
devlinks = 0x3ff90194670,
caps = 0x3ff90194380
}
Fixes: 05e6cdafa6e0 ("node_device: detect CSS devices")
Reviewed-by: Boris Fiuczynski <fiuczy(a)linux.ibm.com>
Signed-off-by: Marc Hartmayer <mhartmay(a)linux.ibm.com>
---
src/node_device/node_device_udev.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/node_device/node_device_udev.c b/src/node_device/node_device_udev.c
index 5f2841bb7d8e..12e3f30badd1 100644
--- a/src/node_device/node_device_udev.c
+++ b/src/node_device/node_device_udev.c
@@ -1130,8 +1130,9 @@ udevProcessCSS(struct udev_device *device,
virNodeDeviceDefPtr def)
{
/* only process IO subchannel and vfio-ccw devices to keep the list sane */
- if (STRNEQ(def->driver, "io_subchannel") &&
- STRNEQ(def->driver, "vfio_ccw"))
+ if (!def->driver ||
+ (STRNEQ(def->driver, "io_subchannel") &&
+ STRNEQ(def->driver, "vfio_ccw")))
return -1;
if (udevGetCCWAddress(def->sysfs_path, &def->caps->data) < 0)
--
2.25.4