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authorMichael S. Tsirkin <mst@redhat.com>2012-11-26 05:57:27 +0000
committerDavid S. Miller <davem@davemloft.net>2012-11-28 11:27:01 -0500
commitbd97120fc3d1a11f3124c7c9ba1d91f51829eb85 (patch)
tree9b7dd4ce2b3a1be219f3b62098be892540765951 /drivers/vhost
parentc3b2c2581988d304127c2aa218430b5fca88ce56 (diff)
downloadop-kernel-dev-bd97120fc3d1a11f3124c7c9ba1d91f51829eb85.zip
op-kernel-dev-bd97120fc3d1a11f3124c7c9ba1d91f51829eb85.tar.gz
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>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vhost.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c
index 99ac2cb..dedaf81 100644
--- a/drivers/vhost/vhost.c
+++ b/drivers/vhost/vhost.c
@@ -1076,7 +1076,7 @@ static int translate_desc(struct vhost_dev *dev, u64 addr, u32 len,
}
_iov = iov + ret;
size = reg->memory_size - addr + reg->guest_phys_addr;
- _iov->iov_len = min((u64)len, size);
+ _iov->iov_len = min((u64)len - s, size);
_iov->iov_base = (void __user *)(unsigned long)
(reg->userspace_addr + addr - reg->guest_phys_addr);
s += size;
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