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drm/amd/display: set new_stream to NULL after release

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In dm_update_crtc_state(), the skip_modeset path releases new_stream
via dc_stream_release() but does not set the pointer to NULL.

If a later error (e.g., color management failure) triggers the fail
label, the error path calls dc_stream_release() again on the same
dangling pointer, causing a double release and potential use-after-free.

Fix this by setting new_stream to NULL after the initial release.

Fixes: 9b690ef3c7 ("drm/amd/display: Avoid full modeset when not required")
Signed-off-by: WenTao Liang <vulab@iscas.ac.cn>
Reviewed-by: George Zhang <george.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
WenTao Liang 2026-06-28 15:27:40 +08:00 committed by Alex Deucher
parent dcda837157
commit 99f3af1907
1 changed files with 1 additions and 0 deletions
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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@ -6046,6 +6046,7 @@ static int dm_update_crtc_state(struct amdgpu_display_manager *dm,
/* Release extra reference */
if (new_stream)
dc_stream_release(new_stream);
new_stream = NULL;
/*
* We want to do dc stream updates that do not require a