drm/amd/display: Guard against NULL pointer deref when get_i2c_info fails

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[ Upstream commit 44a09e3d95 ]

[Why]
If the BIOS table is invalid or corrupt then get_i2c_info can fail
and we dereference a NULL pointer.

[How]
Check that ddc_pin is not NULL before using it and log an error if it
is because this is unexpected.

Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: Eric Yang <eric.yang2@amd.com>
Acked-by: Anson Jacob <anson.jacob@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

Nicholas Kazlauskas 2020-12-18 12:14:00 -05:00 • committed by Greg Kroah-Hartman

parent 3418abd7c6

commit a986f93454

1 changed files with 5 additions and 0 deletions

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drivers/gpu/drm/amd/display/dc/core/dc_link.c

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