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authorHannes Frederic Sowa <hannes@stressinduktion.org>2015-10-27 22:40:42 +0100
committerDavid S. Miller <davem@davemloft.net>2015-11-01 12:01:28 -0500
commit405c92f7a5417274419192ad134d6dc71aedaaa4 (patch)
treef8bdf8d76e562a59e793c6959d37ede634cd0a68 /net/ipv6/ip6_output.c
parent682b1a9d3f9686ee43fd66b48605daff00522157 (diff)
downloadlinux-sh-405c92f7a5417274419192ad134d6dc71aedaaa4.tar.gz
ipv6: 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. Fixes: commit 32dce968dd987 ("ipv6: Allow for partial checksums on non-ufo packets") See-also: commit 72e843bb09d45 ("ipv6: ip6_fragment() should check CHECKSUM_PARTIAL") 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/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 81ac5a970e43..e6a7bd15b9b7 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -603,6 +603,10 @@ int ip6_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
frag_id = ipv6_select_ident(net, &ipv6_hdr(skb)->daddr,
&ipv6_hdr(skb)->saddr);
+ if (skb->ip_summed == CHECKSUM_PARTIAL &&
+ (err = skb_checksum_help(skb)))
+ goto fail;
+
hroom = LL_RESERVED_SPACE(rt->dst.dev);
if (skb_has_frag_list(skb)) {
int first_len = skb_pagelen(skb);
@@ -731,10 +735,6 @@ slow_path_clean:
}
slow_path:
- if ((skb->ip_summed == CHECKSUM_PARTIAL) &&
- skb_checksum_help(skb))
- goto fail;
-
left = skb->len - hlen; /* Space per frame */
ptr = hlen; /* Where to start from */