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drm/amd/display: Check null pointer before try to access it

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commit 1b686053c06ffb9f4524b288110cf2a831ff7a25 upstream.

[why & how]
Change the order of the pipe_ctx->plane_state check to ensure that
plane_state is not null before accessing it.

Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
[Xiangyu: BP to fix CVE: CVE-2024-49906, modified the source path]
Signed-off-by: Xiangyu Chen <xiangyu.chen@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Rodrigo Siqueira
2024-07-30 20:02:45 -06:00
committed by Greg Kroah-Hartman
parent ec1be3c527
commit ebef661621
1 changed files with 7 additions and 3 deletions
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10
drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c
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@@ -1741,13 +1741,17 @@ static void dcn20_program_pipe(
(pipe_ctx->plane_state && pipe_ctx->plane_state->update_flags.bits.hdr_mult))
hws->funcs.set_hdr_multiplier(pipe_ctx);
if (pipe_ctx->update_flags.bits.enable ||
(pipe_ctx->plane_state &&
if ((pipe_ctx->plane_state && pipe_ctx->plane_state->update_flags.bits.hdr_mult) ||
pipe_ctx->update_flags.bits.enable)
hws->funcs.set_hdr_multiplier(pipe_ctx);
if ((pipe_ctx->plane_state &&
pipe_ctx->plane_state->update_flags.bits.in_transfer_func_change) ||
(pipe_ctx->plane_state &&
pipe_ctx->plane_state->update_flags.bits.gamma_change) ||
(pipe_ctx->plane_state &&
pipe_ctx->plane_state->update_flags.bits.lut_3d))
pipe_ctx->plane_state->update_flags.bits.lut_3d) ||
pipe_ctx->update_flags.bits.enable)
hws->funcs.set_input_transfer_func(dc, pipe_ctx, pipe_ctx->plane_state);
/* dcn10_translate_regamma_to_hw_format takes 750us to finish