virtio: Initialize vq->data entries to NULL
vq operations depend on vq->data[i] being NULL to figure out if the vq entry is in use (since the previous patch). We have to initialize them to NULL to ensure we don't work with junk data and trigger false BUG_ONs. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Shirley Ma <xma@us.ibm.com>
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@ -448,8 +448,11 @@ struct virtqueue *vring_new_virtqueue(unsigned int num,
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/* Put everything in free lists. */
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vq->num_free = num;
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vq->free_head = 0;
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for (i = 0; i < num-1; i++)
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for (i = 0; i < num-1; i++) {
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vq->vring.desc[i].next = i+1;
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vq->data[i] = NULL;
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}
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vq->data[i] = NULL;
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return &vq->vq;
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}
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