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drm/amd/display: check dc_link before dereferencing

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drivers/gpu/drm/amd/amdgpu/../display/amdgpu_dm/amdgpu_dm.c:6683 amdgpu_dm_connector_funcs_force()
warn: variable dereferenced before check 'dc_link' (see line 6663)

Fixes: 9671761792 ("drm/amd/display: fix null-pointer dereference on edid reading")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Melissa Wen 2024-02-27 16:08:25 -03:00 committed by Alex Deucher
parent 6601c15c8a
commit e9098cc9ae
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -6539,7 +6539,7 @@ static void amdgpu_dm_connector_funcs_force(struct drm_connector *connector)
struct edid *edid;
struct i2c_adapter *ddc;
if (dc_link->aux_mode)
if (dc_link && dc_link->aux_mode)
ddc = &aconnector->dm_dp_aux.aux.ddc;
else
ddc = &aconnector->i2c->base;