[PATCH] drm/syncobj: fix leaking dma_fence in drm_syncobj_query_ioctl

[Christian König]

We need to check the context number instead if the previous sequence to detect
an error and if an error is detected we need to drop the reference to the
current fence or otherwise would leak it.

Signed-off-by: Christian König <christian.koenig at amd.com>
---
 drivers/gpu/drm/drm_syncobj.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/drm_syncobj.c b/drivers/gpu/drm/drm_syncobj.c
index 75cb4bb7619e..1438dcb3ebb1 100644
--- a/drivers/gpu/drm/drm_syncobj.c
+++ b/drivers/gpu/drm/drm_syncobj.c
@@ -1298,14 +1298,14 @@ int drm_syncobj_query_ioctl(struct drm_device *dev, void *data,
 			struct dma_fence *iter, *last_signaled = NULL;
 
 			dma_fence_chain_for_each(iter, fence) {
-				if (!iter)
-					break;
-				dma_fence_put(last_signaled);
-				last_signaled = dma_fence_get(iter);
-				if (!to_dma_fence_chain(last_signaled)->prev_seqno)
+				if (iter->context != fence->context) {
+					dma_fence_put(iter);
 					/* It is most likely that timeline has
 					 * unorder points. */
 					break;
+				}
+				dma_fence_put(last_signaled);
+				last_signaled = dma_fence_get(iter);
 			}
 			point = dma_fence_is_signaled(last_signaled) ?
 				last_signaled->seqno :
-- 
2.17.1