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| author | Michael S. Tsirkin <mst@redhat.com> | 2012-11-26 05:57:27 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-28 11:27:01 -0500 |
| commit | bd97120fc3d1a11f3124c7c9ba1d91f51829eb85 (patch) | |
| tree | 9b7dd4ce2b3a1be219f3b62098be892540765951 | |
| parent | c3b2c2581988d304127c2aa218430b5fca88ce56 (diff) | |
| download | lwn-bd97120fc3d1a11f3124c7c9ba1d91f51829eb85.tar.gz lwn-bd97120fc3d1a11f3124c7c9ba1d91f51829eb85.zip | |
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>
| -rw-r--r-- | drivers/vhost/vhost.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 99ac2cb08b43..dedaf81d8f36 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; |