[PATCH 6.1 632/772] dma-fence: Fix reference leak on fence merge failure path

[Greg Kroah-Hartman]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>

commit 949291c5314009b4f6e252391edbb40fdd5d5414 upstream.

Release all fence references if the output dma-fence-array could not be
allocated.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at igalia.com>
Fixes: 245a4a7b531c ("dma-buf: generalize dma_fence unwrap & merging v3")
Cc: Christian König <christian.koenig at amd.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Sumit Semwal <sumit.semwal at linaro.org>
Cc: Gustavo Padovan <gustavo at padovan.org>
Cc: Friedrich Vock <friedrich.vock at gmx.de>
Cc: linux-media at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Cc: linaro-mm-sig at lists.linaro.org
Cc: <stable at vger.kernel.org> # v6.0+
Reviewed-by: Christian König <christian.koenig at amd.com>
Signed-off-by: Christian König <christian.koenig at amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241115102153.1980-2-tursulin@igalia.com
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/dma-buf/dma-fence-unwrap.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/dma-buf/dma-fence-unwrap.c b/drivers/dma-buf/dma-fence-unwrap.c
index 628af51c81af..b19d0adf6086 100644
--- a/drivers/dma-buf/dma-fence-unwrap.c
+++ b/drivers/dma-buf/dma-fence-unwrap.c
@@ -164,6 +164,8 @@ struct dma_fence *__dma_fence_unwrap_merge(unsigned int num_fences,
 					dma_fence_context_alloc(1),
 					1, false);
 	if (!result) {
+		for (i = 0; i < count; i++)
+			dma_fence_put(array[i]);
 		tmp = NULL;
 		goto return_tmp;
 	}
-- 
2.47.1