dma-buf/udmabuf: Fix NULL pointer dereference in udmabuf_create

There is a potential execution path in which pointer memfd is NULL when passed as argument to fput(), hence there is a NULL pointer dereference in fput().

Fix this by null checking *memfd* before calling fput().

Addresses-Coverity-ID: 1473174 ("Explicit null dereferenced")

---
 drivers/dma-buf/udmabuf.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

index 8e24204..2e85022 100644
@@ -194,7 +194,8 @@ static long udmabuf_create(struct udmabuf_create_list *head,
 	while (pgbuf > 0)
 		put_page(ubuf->pages[--pgbuf]);
 err_free_ubuf:
-	fput(memfd);
+	if (memfd)
+		fput(memfd);
 	kfree(ubuf->pages);
 	kfree(ubuf);
 	return ret;

2.7.4

Pushed to drm-misc-next.

thanks,
Gerd