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drm/amd/display: Check null-initialized variables

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BugLink: https://bugs.launchpad.net/bugs/2089884

[ Upstream commit 367cd9ceba1933b63bc1d87d967baf6d9fd241d2 ]

[WHAT & HOW]
drr_timing and subvp_pipe are initialized to null and they are not
always assigned new values. It is necessary to check for null before
dereferencing.

This fixes 2 FORWARD_NULL issues reported by Coverity.

Reviewed-by: Nevenko Stupar <nevenko.stupar@amd.com>
Reviewed-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Jerry Zuo <jerry.zuo@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Roxana Nicolescu <roxana.nicolescu@canonical.com>
This commit is contained in:
Alex Hung
2024-06-27 17:34:18 -06:00
committed by Mehmet Basaran
parent 89c1413c1c
commit ab625e34ee
1 changed files with 4 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
drivers/gpu/drm/amd/display/dc/dml/dcn32/dcn32_fpu.c
+4 -3
View File
@@ -868,8 +868,9 @@ static bool subvp_drr_schedulable(struct dc *dc, struct dc_state *context)
* for VBLANK: (VACTIVE region of the SubVP pipe can fit the MALL prefetch, VBLANK frame time,
* and the max of (VBLANK blanking time, MALL region)).
*/
if (stretched_drr_us < (1 / (double)drr_timing->min_refresh_in_uhz) * 1000000 * 1000000 &&
subvp_active_us - prefetch_us - stretched_drr_us - max_vblank_mallregion > 0)
if (drr_timing &&
stretched_drr_us < (1 / (double)drr_timing->min_refresh_in_uhz) * 1000000 * 1000000 &&
subvp_active_us - prefetch_us - stretched_drr_us - max_vblank_mallregion > 0)
schedulable = true;
return schedulable;
@@ -934,7 +935,7 @@ static bool subvp_vblank_schedulable(struct dc *dc, struct dc_state *context)
if (!subvp_pipe && pipe_mall_type == SUBVP_MAIN)
subvp_pipe = pipe;
}
if (found) {
if (found && subvp_pipe) {
phantom_stream = dc_state_get_paired_subvp_stream(context, subvp_pipe->stream);
main_timing = &subvp_pipe->stream->timing;
phantom_timing = &phantom_stream->timing;