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authorDing Tianhong <dingtianhong@huawei.com>2017-04-29 05:38:48 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2017-05-01 21:49:53 +0300
commita6a5993243550b09f620941dea741b7421fdf79c (patch)
tree6fe5747d0ba55ff5d431d850e172ef1bc43b3336
parent5ecda13711b3bd4a750b5740897bf13d1720de7c (diff)
downloadlinux-a6a5993243550b09f620941dea741b7421fdf79c.tar.xz
iov_iter: don't revert iov buffer if csum error
The patch 327868212381 (make skb_copy_datagram_msg() et.al. preserve ->msg_iter on error) will revert the iov buffer if copy to iter failed, but it didn't copy any datagram if the skb_checksum_complete error, so no need to revert any data at this place. v2: Sabrina notice that return -EFAULT when checksum error is not correct here, it would confuse the caller about the return value, so fix it. Fixes: 327868212381 ("make skb_copy_datagram_msg() et.al. preserve->msg_iter on error") Cc: stable@vger.kernel.org # v4.11 Signed-off-by: Ding Tianhong <dingtianhong@huawei.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--net/core/datagram.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c
index f4947e737f34..d797baa69e43 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -760,7 +760,7 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,
if (msg_data_left(msg) < chunk) {
if (__skb_checksum_complete(skb))
- goto csum_error;
+ return -EINVAL;
if (skb_copy_datagram_msg(skb, hlen, msg, chunk))
goto fault;
} else {
@@ -768,15 +768,16 @@ int skb_copy_and_csum_datagram_msg(struct sk_buff *skb,
if (skb_copy_and_csum_datagram(skb, hlen, &msg->msg_iter,
chunk, &csum))
goto fault;
- if (csum_fold(csum))
- goto csum_error;
+
+ if (csum_fold(csum)) {
+ iov_iter_revert(&msg->msg_iter, chunk);
+ return -EINVAL;
+ }
+
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
netdev_rx_csum_fault(skb->dev);
}
return 0;
-csum_error:
- iov_iter_revert(&msg->msg_iter, chunk);
- return -EINVAL;
fault:
return -EFAULT;
}