Messages in this thread Patch in this message | | | Date | Mon, 26 Nov 2012 17:57:27 +0200 | From | "Michael S. Tsirkin" <> | Subject | [PATCH] vhost: fix length for cross region descriptor |
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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> --- drivers/vhost/vhost.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index ef8f598..5a3d0f1 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1049,7 +1049,7 @@ 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; -- MST
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