From: Srinivasan Shanmugam srinivasan.shanmugam@amd.com

stable inclusion from stable-v6.11.3 commit 65a6fee22d5cfa645cb05489892dc9cd3d142fc2 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRAY CVE: CVE-2024-49914

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 8e4ed3cf1642df0c4456443d865cff61a9598aa8 ]

This commit addresses a null pointer dereference issue in the `dcn20_program_pipe` function. The issue could occur when `pipe_ctx->plane_state` is null.

The fix adds a check to ensure `pipe_ctx->plane_state` is not null before accessing. This prevents a null pointer dereference.

Reported by smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/hwss/dcn20/dcn20_hwseq.c:1925 dcn20_program_pipe() error: we previously assumed 'pipe_ctx->plane_state' could be null (see line 1877)

Cc: Tom Chung chiahsuan.chung@amd.com Cc: Rodrigo Siqueira Rodrigo.Siqueira@amd.com Cc: Roman Li roman.li@amd.com Cc: Alex Hung alex.hung@amd.com Cc: Aurabindo Pillai aurabindo.pillai@amd.com Cc: Harry Wentland harry.wentland@amd.com Cc: Hamza Mahfooz hamza.mahfooz@amd.com Signed-off-by: Srinivasan Shanmugam srinivasan.shanmugam@amd.com Reviewed-by: Tom Chung chiahsuan.chung@amd.com Signed-off-by: Alex Deucher alexander.deucher@amd.com Signed-off-by: Sasha Levin sashal@kernel.org Conflicts: drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c drivers/gpu/drm/amd/display/dc/hwss/dcn20/dcn20_hwseq.c [The stable version 5.10 is missing patch 65a6fee22d5cfa645cb05489892dc9cd3d142fc2, which was pulled from 6.11. Manually removed unnecessary code, such as if (pipe_ctx->update_flags.bits.det_size), if (hws->funcs.populate_mcm_luts), if (pipe_ctx->update_flags.bits.enable), if ((pipe_ctx->plane_state && pipe_ctx->plane_state->visible)). The purpose of this patch is to check if pipe_ctx->plane_state is not null before using its properties. Other extraneous code from higher versions is unrelated to the current patch and has been removed.] Signed-off-by: Zicheng Qu quzicheng@huawei.com --- drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c index 0adbcfc5e222..8d6a5b45b688 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_hwseq.c @@ -1601,16 +1601,20 @@ static void dcn20_program_pipe( dc->res_pool->hubbub->funcs->force_wm_propagate_to_pipes(dc->res_pool->hubbub); }

- if (pipe_ctx->update_flags.raw || pipe_ctx->plane_state->update_flags.raw || pipe_ctx->stream->update_flags.raw) + if (pipe_ctx->update_flags.raw || + (pipe_ctx->plane_state && pipe_ctx->plane_state->update_flags.raw) || + pipe_ctx->stream->update_flags.raw) dcn20_update_dchubp_dpp(dc, pipe_ctx, context);

- if (pipe_ctx->update_flags.bits.enable - || pipe_ctx->plane_state->update_flags.bits.hdr_mult) + if (pipe_ctx->update_flags.bits.enable || + (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->update_flags.bits.in_transfer_func_change || - pipe_ctx->plane_state->update_flags.bits.gamma_change) + (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)) hws->funcs.set_input_transfer_func(dc, pipe_ctx, pipe_ctx->plane_state);

/* dcn10_translate_regamma_to_hw_format takes 750us to finish