skbuff: Fix skb checksum partial check.
authorPravin B Shelar <pshelar@nicira.com>
Tue, 29 Sep 2015 00:24:25 +0000 (17:24 -0700)
committerDavid S. Miller <davem@davemloft.net>
Tue, 29 Sep 2015 23:48:46 +0000 (16:48 -0700)
commit31b33dfb0a144469dd805514c9e63f4993729a48
treefa7d2bb42af8e4f89805fbd5661f7a0d57d38132
parent741a11d9e4103a8e1c590ef1280143fe654e4e33
skbuff: Fix skb checksum partial check.

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>
include/linux/skbuff.h
net/core/skbuff.c