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drm/syncobj: Fix memory leak in drm_syncobj_find_fence()

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Commit 18226ba521 ("drm/syncobj: reject invalid flags in
drm_syncobj_find_fence") forgot to take into account the fact that
drm_syncobj_find() takes a reference to syncobj and returns early
without dropping the reference, leading to memory leaks.

Fixes: 18226ba521 ("drm/syncobj: reject invalid flags in drm_syncobj_find_fence")
Reported by: Sam Spencer <sam.spencer@arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Acked-by: Erik Kurzinger <ekurzinger@gmail.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://lore.kernel.org/all/20260507144425.2488057-1-liviu.dudau@arm.com
This commit is contained in:
Liviu Dudau
2026-05-18 11:19:59 +01:00
parent 9cff907748
commit e5b93bd6fd
1 changed files with 6 additions and 4 deletions
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drivers/gpu/drm/drm_syncobj.c
+6 -4
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@@ -442,13 +442,15 @@ int drm_syncobj_find_fence(struct drm_file *file_private,
u64 timeout = nsecs_to_jiffies64(DRM_SYNCOBJ_WAIT_FOR_SUBMIT_TIMEOUT);
int ret;
if (flags & ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT)
return -EINVAL;
if (!syncobj)
return -ENOENT;
/* Waiting for userspace with locks help is illegal cause that can
if (flags & ~DRM_SYNCOBJ_WAIT_FLAGS_WAIT_FOR_SUBMIT) {
ret = -EINVAL;
goto out;
}
/* Waiting for userspace with locks held is illegal cause that can
* trivial deadlock with page faults for example. Make lockdep complain
* about it early on.
*/