diff options
| author | Pravin B Shelar <pshelar@nicira.com> | 2015-09-28 17:24:25 -0700 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-08-26 20:45:11 +0200 |
| commit | d1696f0a0fda89b1af799d0be02c2553be5a8ed3 (patch) | |
| tree | 6c808f2b9bdce05c12866dfc52d2de48378380a2 /include/linux | |
| parent | 0104e74ee043df657f1f0252665b87eda88ccc9d (diff) | |
skbuff: Fix skb checksum partial check.
[ Upstream commit 31b33dfb0a144469dd805514c9e63f4993729a48 ]
Earlier patch 6ae459bda tried to detect void ckecksum partial
skb by comparing pull length to checksum offset. But it does
not work for all cases since checksum-offset depends on
updates to skb->data.
Following patch fixes it by validating checksum start offset
after skb-data pointer is updated. Negative value of checksum
offset start means there is no need to checksum.
Fixes: 6ae459bda ("skbuff: Fix skb checksum flag on skb pull")
Reported-by: Andrew Vagin <avagin@odin.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stefan Guendhoer <stefan@guendhoer.com>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/skbuff.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 19998b8c7..993e34774 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -2364,7 +2364,7 @@ static inline void skb_postpull_rcsum(struct sk_buff *skb, if (skb->ip_summed == CHECKSUM_COMPLETE) skb->csum = csum_sub(skb->csum, csum_partial(start, len, 0)); else if (skb->ip_summed == CHECKSUM_PARTIAL && - skb_checksum_start_offset(skb) <= len) + skb_checksum_start_offset(skb) < 0) skb->ip_summed = CHECKSUM_NONE; } |