Zhou Qingyang 588a70177d
drm/amd/display: Fix a NULL pointer dereference in amdgpu_dm_connector_add_common_modes() ...
In amdgpu_dm_connector_add_common_modes(), amdgpu_dm_create_common_mode()
is assigned to mode and is passed to drm_mode_probed_add() directly after
that. drm_mode_probed_add() passes &mode->head to list_add_tail(), and
there is a dereference of it in list_add_tail() without recoveries, which
could lead to NULL pointer dereference on failure of
amdgpu_dm_create_common_mode().
Fix this by adding a NULL check of mode.
This bug was found by a static analyzer.
Builds with 'make allyesconfig' show no new warnings,
and our static analyzer no longer warns about this code.
Fixes: e7b07ceef2zhou1615@umn.edu >
Signed-off-by: Alex Deucher <alexander.deucher@amd.com >
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Zhou Qingyang
588a70177d