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drm/amd/display: Avoid NULL dereference of timing generator

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[ Upstream commit b1904ed480cee3f9f4036ea0e36d139cb5fee2d6 ]

[Why & How]
Check whether assigned timing generator is NULL or not before
accessing its funcs to prevent NULL dereference.

Reviewed-by: Jun Lei <jun.lei@amd.com>
Acked-by: Hersen Wu <hersenxs.wu@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@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>
This commit is contained in:
Wayne Lin 2023-09-08 10:14:49 +08:00 committed by Greg Kroah-Hartman
parent 514565ff7f
commit eac3e4760a
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/display/dc/core/dc_stream.c
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@ -492,7 +492,7 @@ uint32_t dc_stream_get_vblank_counter(const struct dc_stream_state *stream)
for (i = 0; i < MAX_PIPES; i++) {
struct timing_generator *tg = res_ctx->pipe_ctx[i].stream_res.tg;
if (res_ctx->pipe_ctx[i].stream != stream)
if (res_ctx->pipe_ctx[i].stream != stream || !tg)
continue;
return tg->funcs->get_frame_count(tg);
@ -551,7 +551,7 @@ bool dc_stream_get_scanoutpos(const struct dc_stream_state *stream,
for (i = 0; i < MAX_PIPES; i++) {
struct timing_generator *tg = res_ctx->pipe_ctx[i].stream_res.tg;
if (res_ctx->pipe_ctx[i].stream != stream)
if (res_ctx->pipe_ctx[i].stream != stream || !tg)
continue;
tg->funcs->get_scanoutpos(tg,