From: Alex Hung alex.hung@amd.com

mainline inclusion from mainline-v6.12-rc1 commit 5559598742fb4538e4c51c48ef70563c49c2af23 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IAYRD1 CVE: CVE-2024-49923

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

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[WHAT & HOW] "dcn20_validate_apply_pipe_split_flags" dereferences merge, and thus it cannot be a null pointer. Let's pass a valid pointer to avoid null dereference.

This fixes 2 FORWARD_NULL issues reported by Coverity.

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 Conflicts: drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c drivers/gpu/drm/amd/display/dc/resource/dcn20/dcn20_resource.c drivers/gpu/drm/amd/display/dc/resource/dcn21/dcn21_resource.c [Path changed and there is no logical conflict.] Signed-off-by: Tirui Yin yintirui@huawei.com Reviewed-by: Chen Jun chenjun102@huawei.com --- drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c index 2990793e86a2..559602336f67 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c +++ b/drivers/gpu/drm/amd/display/dc/dcn20/dcn20_resource.c @@ -2845,6 +2845,7 @@ bool dcn20_fast_validate_bw( { bool out = false; int split[MAX_PIPES] = { 0 }; + bool merge[MAX_PIPES] = { false }; int pipe_cnt, i, pipe_idx, vlevel;

ASSERT(pipes); @@ -2867,7 +2868,7 @@ bool dcn20_fast_validate_bw( if (vlevel > context->bw_ctx.dml.soc.num_states) goto validate_fail;

- vlevel = dcn20_validate_apply_pipe_split_flags(dc, context, vlevel, split, NULL); + vlevel = dcn20_validate_apply_pipe_split_flags(dc, context, vlevel, split, merge);

/*initialize pipe_just_split_from to invalid idx*/ for (i = 0; i < MAX_PIPES; i++)