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drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free()

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commit 6b79f96f4a upstream.

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.

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: 377f8331d0 ("drm/virtio: fix possible leak/unlock virtio_gpu_object_array")
Link: http://patchwork.freedesktop.org/patch/msgid/20211213183122.838119-1-roberto.sassu@huawei.com
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Roberto Sassu 2021-12-13 19:31:22 +01:00 • committed by Justin Hammond
parent 98e9918391
commit 47a2140150
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/virtio/virtgpu_gem.c
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@ -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);