From: Roberto Sassu Sent: Monday, December 13, 2021 7:31 PM If virtio_gpu_object_shmem_init() fails (e.g. due to fault injection, as it happened in the bug report by syzbot), virtio_gpu_array_put_free() could be called with objs equal to NULL.

Ensure that objs is not NULL in virtio_gpu_array_put_free(), or otherwise return from the function.

Hello

did you have the chance to look at this patch?

Thanks

Roberto

HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063 Managing Director: Li Peng, Zhong Ronghua

Cc: stable@vger.kernel.org # 5.13.x Signed-off-by: Roberto Sassu roberto.sassu@huawei.com Reported-by: syzbot+e9072e90624a31dfa85f@syzkaller.appspotmail.com Fixes: 377f8331d0565 ("drm/virtio: fix possible leak/unlock virtio_gpu_object_array")

---

drivers/gpu/drm/virtio/virtgpu_gem.c | 3 +++ 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c index 2de61b63ef91..48d3c9955f0d 100644 --- a/drivers/gpu/drm/virtio/virtgpu_gem.c +++ b/drivers/gpu/drm/virtio/virtgpu_gem.c @@ -248,6 +248,9 @@ void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs) { u32 i;

• if (!objs)

• return;
  

• for (i = 0; i < objs->nents; i++) drm_gem_object_put(objs->objs[i]); virtio_gpu_array_free(objs);

-- 2.32.0