* Patch "iov_iter: don't revert iov buffer if csum error" has been added to the 4.9-stable tree
@ 2017-05-17 15:57 gregkh
0 siblings, 0 replies; only message in thread
From: gregkh @ 2017-05-17 15:57 UTC (permalink / raw)
To: dingtianhong, gregkh, viro, weiyongjun1; +Cc: stable, stable-commits
This is a note to let you know that I've just added the patch titled
iov_iter: don't revert iov buffer if csum error
to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iov_iter-don-t-revert-iov-buffer-if-csum-error.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.
>From a6a5993243550b09f620941dea741b7421fdf79c Mon Sep 17 00:00:00 2001
From: Ding Tianhong <dingtianhong@huawei.com>
Date: Sat, 29 Apr 2017 10:38:48 +0800
Subject: iov_iter: don't revert iov buffer if csum error
From: Ding Tianhong <dingtianhong@huawei.com>
commit a6a5993243550b09f620941dea741b7421fdf79c upstream.
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")
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
net/core/datagram.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -740,7 +740,7 @@ int skb_copy_and_csum_datagram_msg(struc
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 {
@@ -748,15 +748,16 @@ int skb_copy_and_csum_datagram_msg(struc
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;
}
Patches currently in stable-queue which might be from dingtianhong@huawei.com are
queue-4.9/iov_iter-don-t-revert-iov-buffer-if-csum-error.patch
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2017-05-17 15:57 Patch "iov_iter: don't revert iov buffer if csum error" has been added to the 4.9-stable tree gregkh
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