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vhost: vringh: Modify the return value check

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[ Upstream commit 82a8d0fda55b35361ee7f35b54fa2b66d7847d2b ]

The return value of copy_from_iter and copy_to_iter can't be negative,
check whether the copied lengths are equal.

Fixes: 309bba39c9 ("vringh: iterate on iotlb_translate to handle large translations")
Cc: "Stefano Garzarella" <sgarzare@redhat.com>
Signed-off-by: zhang jiao <zhangjiao2@cmss.chinamobile.com>
Message-Id: <20250910091739.2999-1-zhangjiao2@cmss.chinamobile.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
zhang jiao 2025-09-10 17:17:38 +08:00 committed by Greg Kroah-Hartman
parent f8648cb418
commit db042925a5
1 changed files with 4 additions and 3 deletions
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7
drivers/vhost/vringh.c
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@ -1162,6 +1162,7 @@ static inline int copy_from_iotlb(const struct vringh *vrh, void *dst,
struct iov_iter iter;
u64 translated;
int ret;
size_t size;
ret = iotlb_translate(vrh, (u64)(uintptr_t)src,
len - total_translated, &translated,
@ -1173,9 +1174,9 @@ static inline int copy_from_iotlb(const struct vringh *vrh, void *dst,
iov_iter_bvec(&iter, ITER_SOURCE, iov, ret, translated);
ret = copy_from_iter(dst, translated, &iter);
if (ret < 0)
return ret;
size = copy_from_iter(dst, translated, &iter);
if (size != translated)
return -EFAULT;
src += translated;
dst += translated;