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drm/amd/display: Add sanity checks for drm_edid_raw()

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When EDID is retrieved via drm_edid_raw(), it doesn't guarantee to
return proper EDID bytes the caller wants: it may be either NULL (that
leads to an Oops) or with too long bytes over the fixed size raw_edid
array (that may lead to memory corruption).  The latter was reported
actually when connected with a bad adapter.

Add sanity checks for drm_edid_raw() to address the above corner
cases, and return EDID_BAD_INPUT accordingly.

Fixes: 48edb2a4256e ("drm/amd/display: switch amdgpu_dm_connector to use struct drm_edid")
Link: https://bugzilla.suse.com/show_bug.cgi?id=1236415
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 648d3f4d209725d51900d6a3ed46b7b600140cdf)
Cc: stable@vger.kernel.org
This commit is contained in:
Takashi Iwai 2025-06-16 18:08:41 +02:00 committed by Alex Deucher
parent 66abb99699
commit 6847b3b6e8
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
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@ -1029,6 +1029,10 @@ enum dc_edid_status dm_helpers_read_local_edid(
return EDID_NO_RESPONSE;
edid = drm_edid_raw(drm_edid); // FIXME: Get rid of drm_edid_raw()
if (!edid ||
edid->extensions >= sizeof(sink->dc_edid.raw_edid) / EDID_LENGTH)
return EDID_BAD_INPUT;
sink->dc_edid.length = EDID_LENGTH * (edid->extensions + 1);
memmove(sink->dc_edid.raw_edid, (uint8_t *)edid, sink->dc_edid.length);