drm/amd/display: Fix dangling pointer in plane reset function

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amdgpu_dm_plane_drm_plane_reset() frees the old state before allocating
a new one. If kzalloc() fails, the function returns without updating
the state pointer, leaving a dangling pointer to already freed memory.

Fix this by allocating the new state first. On allocation failure, the
old state remains untouched and the function safely returns.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 5d945cbcd4 ("drm/amd/display: Create a file dedicated to planes")
Signed-off-by: Evgenii Burenchev <evg28bur@yandex.ru>
Reviewed-by: Mario Limonciello (AMD) <superm1@kernel.org>
Link: https://patch.msgid.link/20260629090435.9729-3-evg28bur@yandex.ru
[adjust for movement around current amd-staging-drm-next]
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Evgenii Burenchev 2026-06-29 15:58:50 -05:00 • committed by Alex Deucher

parent 27213b776a

commit 98cad4bd14

1 changed files with 4 additions and 6 deletions

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drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_plane.c

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