dma-buf: free dmabuf->name in dma_buf_release()

dma-buf name can be set via DMA_BUF_SET_NAME ioctl, but once set
it never gets freed.

Free it in dma_buf_release().

Fixes: bb2bb90 ("dma-buf: add DMA_BUF_SET_NAME ioctls")
Reported-by: [email protected]
Cc: Greg Hackmann <[email protected]>
Cc: Chenbo Feng <[email protected]>
Cc: Sumit Semwal <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
Acked-by: Chenbo Feng <[email protected]>
Signed-off-by: Sumit Semwal <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: congwang

drivers/dma-buf/dma-buf.c

@@ -108,6 +108,7 @@ static int dma_buf_release(struct inode *inode, struct file *file)
 		dma_resv_fini(dmabuf->resv);
 
 	module_put(dmabuf->owner);
+	kfree(dmabuf->name);
 	kfree(dmabuf);
 	return 0;
 }