diff options
| author | zhang jiao <zhangjiao2@cmss.chinamobile.com> | 2025-09-10 17:17:38 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2025-10-01 07:24:20 -0400 |
| commit | 82a8d0fda55b35361ee7f35b54fa2b66d7847d2b (patch) | |
| tree | ef4cde9fa2934f45172dd344554621db816802b7 | |
| parent | e5f0a698b34ed76002dc5cff3804a61c80233a7a (diff) | |
vhost: vringh: Modify the return value check
The return value of copy_from_iter and copy_to_iter can't be negative,
check whether the copied lengths are equal.
Fixes: 309bba39c945 ("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>
| -rw-r--r-- | drivers/vhost/vringh.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/vhost/vringh.c b/drivers/vhost/vringh.c index 9f27c3f6091b..0c8a17cbb22e 100644 --- a/drivers/vhost/vringh.c +++ b/drivers/vhost/vringh.c @@ -1115,6 +1115,7 @@ 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, @@ -1132,9 +1133,9 @@ static inline int copy_from_iotlb(const struct vringh *vrh, void *dst, 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; |