diff options
| author |   Ding Tianhong <dingtianhong@huawei.com> | 2017-04-29 10:38:48 +0800 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2017-05-01 14:49:53 -0400 |
| commit | a6a5993243550b09f620941dea741b7421fdf79c (patch) | |
| tree | 6fe5747d0ba55ff5d431d850e172ef1bc43b3336 /net/core | |
| parent | generic_file_read_iter(): make use of iov_iter_revert() (diff) | |
| download | linux-dev-a6a5993243550b09f620941dea741b7421fdf79c.tar.xz linux-dev-a6a5993243550b09f620941dea741b7421fdf79c.zip | |
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>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/datagram.c | 13 |
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; } |