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authorHannes Frederic Sowa <hannes@stressinduktion.org>2015-10-27 22:40:40 +0100
committerDavid S. Miller <davem@davemloft.net>2015-11-01 12:01:27 -0500
commitdbd3393c56a8794fe596e7dd20d0efa613b9cf61 (patch)
tree3a6b5ade5ee0044ef766b753738945295e3b248c /net/ipv4/ip_output.c
parentd749c9cbffd666956694f307d237e018c464d973 (diff)
downloadlinux-dbd3393c56a8794fe596e7dd20d0efa613b9cf61.tar.bz2
ipv4: add defensive check for CHECKSUM_PARTIAL skbs in ip_fragment
CHECKSUM_PARTIAL skbs should never arrive in ip_fragment. If we get one of those warn about them once and handle them gracefully by recalculating the checksum. Cc: Eric Dumazet <edumazet@google.com> Cc: Vlad Yasevich <vyasevich@gmail.com> Cc: Benjamin Coddington <bcodding@redhat.com> Cc: Tom Herbert <tom@herbertland.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_output.c')
-rw-r--r--net/ipv4/ip_output.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 0b024178edd3..4233cbe47052 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -533,6 +533,11 @@ int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
dev = rt->dst.dev;
+ /* for offloaded checksums cleanup checksum before fragmentation */
+ if (skb->ip_summed == CHECKSUM_PARTIAL &&
+ (err = skb_checksum_help(skb)))
+ goto fail;
+
/*
* Point into the IP datagram header.
*/
@@ -657,9 +662,6 @@ slow_path_clean:
}
slow_path:
- /* for offloaded checksums cleanup checksum before fragmentation */
- if ((skb->ip_summed == CHECKSUM_PARTIAL) && skb_checksum_help(skb))
- goto fail;
iph = ip_hdr(skb);
left = skb->len - hlen; /* Space per frame */