diff options
| author | Nicholas Kazlauskas <nicholas.kazlauskas@amd.com> | 2020-12-18 20:14:00 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-07 14:18:59 +0300 |
| commit | 5886337edaa8d0a1459054452661d46f2ab0a2e2 (patch) | |
| tree | cd07915af71674721f0564a9c1a0845bdac91138 /drivers/gpu | |
| parent | 77e54793da0f17b6acad19471dc6f1f938a5e7f1 (diff) | |
| download | linux-5886337edaa8d0a1459054452661d46f2ab0a2e2.tar.xz | |
drm/amd/display: Guard against NULL pointer deref when get_i2c_info fails
[ Upstream commit 44a09e3d95bd2b7b0c224100f78f335859c4e193 ]
[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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index fa0e6c8e2447..e3bedf4cc9c0 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -1124,6 +1124,11 @@ static bool construct( goto ddc_create_fail; } + if (!link->ddc->ddc_pin) { + DC_ERROR("Failed to get I2C info for connector!\n"); + goto ddc_create_fail; + } + link->ddc_hw_inst = dal_ddc_get_line( dal_ddc_service_get_ddc_pin(link->ddc)); |