From 0aeed866cb938943908c3ba46422128e49d2d080 Mon Sep 17 00:00:00 2001 From: Evgenii Burenchev Date: Mon, 29 Jun 2026 15:58:56 -0500 Subject: [PATCH] drm/amd/display: Fix dangling pointer in CRTC reset function amdgpu_dm_crtc_reset_state() 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: e7b07ceef2a6 ("drm/amd/display: Merge amdgpu_dm_crtc and dm_crtc_state") Signed-off-by: Evgenii Burenchev Reviewed-by: Mario Limonciello (AMD) Link: https://patch.msgid.link/20260629090435.9729-4-evg28bur@yandex.ru [adjust for movement around current amd-staging-drm-next] Signed-off-by: Mario Limonciello Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c index f7fcce6e76bb..0ad7704800d9 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_crtc.c @@ -444,13 +444,13 @@ static void amdgpu_dm_crtc_reset_state(struct drm_crtc *crtc) { struct dm_crtc_state *state; + state = kzalloc_obj(*state); + if (!state) + return; + if (crtc->state) amdgpu_dm_crtc_destroy_state(crtc, crtc->state); - state = kzalloc_obj(*state); - if (WARN_ON(!state)) - return; - __drm_atomic_helper_crtc_reset(crtc, &state->base); }