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xf86drm: Fix error path in drmGetDevice2 

In drmGetDevice2 when no local device is found or when
drm_device_has_rdev filters out all devices, *device might be left
uninitialized causing drmGetDevice2 to not return error - since
it's only returned when *device == NULL.

Above leads to crash in the firefox in system with amdgpu.

With this change firefox displays:

libGL error: MESA-LOADER: failed to retrieve device information
libGL error: unable to load driver: amdgpu_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: amdgpu
libGL error: MESA-LOADER: failed to retrieve device information
libGL error: unable to load driver: amdgpu_dri.so
libGL error: driver pointer missing
libGL error: failed to load driver: amdgpu

and doesn't crash.

Bugzilla: https://bugs.freedesktop.org/107384
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Mariusz Ceier <mceier+mesa-dev@gmail.com>
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Mariusz Ceier 2018-07-29 10:20:14 +02:00 committed by Michel Dänzer
parent 9c979e0ec4
commit 4519db23ef
1 changed files with 2 additions and 0 deletions
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2
xf86drm.c
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@ -3935,6 +3935,8 @@ int drmGetDevice2(int fd, uint32_t flags, drmDevicePtr *device)
drmFoldDuplicatedDevices(local_devices, node_count);
*device = NULL;
for (i = 0; i < node_count; i++) {
if (!local_devices[i])
continue;