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vhost: fix length for cross region descriptor
If a single descriptor crosses a region, the second chunk length should be decremented by size translated so far, instead it includes the full descriptor length. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -1076,7 +1076,7 @@ static int translate_desc(struct vhost_dev *dev, u64 addr, u32 len,
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}
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_iov = iov + ret;
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size = reg->memory_size - addr + reg->guest_phys_addr;
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_iov->iov_len = min((u64)len, size);
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_iov->iov_len = min((u64)len - s, size);
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_iov->iov_base = (void __user *)(unsigned long)
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(reg->userspace_addr + addr - reg->guest_phys_addr);
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s += size;
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