From: Robert McClinton <rbmccav@gmail.com> stable inclusion from stable-v6.12.60 commit 73bc12d6a547f9571ce4393acfd73c004e2df9e5 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/11558 CVE: CVE-2025-68223 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 9eb00b5f5697bd56baa3222c7a1426fa15bacfb5 upstream. Delete the attempt to progress the queue when checking if fence is signaled. This avoids deadlock. dma-fence_ops::signaled can be called with the fence lock in unknown state. For radeon, the fence lock is also the wait queue lock. This can cause a self deadlock when signaled() tries to make forward progress on the wait queue. But advancing the queue is unneeded because incorrectly returning false from signaled() is perfectly acceptable. Link: https://github.com/brave/brave-browser/issues/49182 Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4641 Cc: Alex Deucher <alexander.deucher@amd.com> Signed-off-by: Robert McClinton <rbmccav@gmail.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> (cherry picked from commit 527ba26e50ec2ca2be9c7c82f3ad42998a75d0db) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Conflicts: drivers/gpu/drm/radeon/radeon_fence.c [Context Conflicts] Signed-off-by: Lin Ruifeng <linruifeng4@huawei.com> --- drivers/gpu/drm/radeon/radeon_fence.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon_fence.c b/drivers/gpu/drm/radeon/radeon_fence.c index 8735bf2bb8b5..b6210460f39b 100644 --- a/drivers/gpu/drm/radeon/radeon_fence.c +++ b/drivers/gpu/drm/radeon/radeon_fence.c @@ -370,14 +370,6 @@ static bool radeon_fence_is_signaled(struct dma_fence *f) return true; } - if (down_read_trylock(&rdev->exclusive_lock)) { - radeon_fence_process(rdev, ring); - up_read(&rdev->exclusive_lock); - - if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { - return true; - } - } return false; } -- 2.43.0