virtio: fix memory leak in virtqueue_add()
When using the indirect buffers feature, 'desc' is allocated in virtqueue_add() but isn't freed before leaving on a ring full error, causing a memory leak. For example, it seems rather clear that this can trigger with virtio net if mergeable buffers are not used. Cc: stable@vger.kernel.org Signed-off-by: Wei Yongjun <weiyj.lk@gmail.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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@ -327,6 +327,8 @@ static inline int virtqueue_add(struct virtqueue *_vq,
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* host should service the ring ASAP. */
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if (out_sgs)
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vq->notify(&vq->vq);
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if (indirect)
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kfree(desc);
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END_USE(vq);
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return -ENOSPC;
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}
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