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| author | Sergey Popovich <popovich_sergei@mail.ru> | 2014-05-08 16:22:35 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-06-11 12:03:27 -0700 |
| commit | 25a685d20e45eec5233fe1d67d9afe31983585b7 (patch) | |
| tree | 80cb989e679c1fd7210c32993411099ec40a146a | |
| parent | c318d7b4db9b4f47e0e29c24f4cac6f5e0644dc1 (diff) | |
| download | lwn-25a685d20e45eec5233fe1d67d9afe31983585b7.tar.gz lwn-25a685d20e45eec5233fe1d67d9afe31983585b7.zip | |
netfilter: Fix potential use after free in ip6_route_me_harder()
commit a8951d5814e1373807a94f79f7ccec7041325470 upstream.
Dst is released one line before we access it again with dst->error.
Fixes: 58e35d147128 netfilter: ipv6: propagate routing errors from
ip6_route_me_harder()
Signed-off-by: Sergey Popovich <popovich_sergei@mail.ru>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/ipv6/netfilter.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c index 95f3f1da0d7f..d38e6a8d8b9f 100644 --- a/net/ipv6/netfilter.c +++ b/net/ipv6/netfilter.c @@ -30,13 +30,15 @@ int ip6_route_me_harder(struct sk_buff *skb) .daddr = iph->daddr, .saddr = iph->saddr, }; + int err; dst = ip6_route_output(net, skb->sk, &fl6); - if (dst->error) { + err = dst->error; + if (err) { IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n"); dst_release(dst); - return dst->error; + return err; } /* Drop old route. */ |