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| author | YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> | 2007-05-09 14:01:59 -0700 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2007-09-08 21:21:38 +0200 |
| commit | c7110d58361373f38fc8082da64359ea70bd9ee5 (patch) | |
| tree | d7c998ed0bb455d1acf77acc077ac0d1dba85b8a | |
| parent | d412ded8fd2bbb25fd590e28dde91229f5ce22b7 (diff) | |
| download | linux-stable-c7110d58361373f38fc8082da64359ea70bd9ee5.tar.gz linux-stable-c7110d58361373f38fc8082da64359ea70bd9ee5.tar.bz2 linux-stable-c7110d58361373f38fc8082da64359ea70bd9ee5.zip | |
[IPV6]: Do no rely on skb->dst before it is assigned.
Because skb->dst is assigned in ip6_route_input(), it is really
bad to use it in hop-by-hop option handler(s).
Closes: Bug #8450 (Eric Sesterhenn <snakebyte@gmx.de>)
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
| -rw-r--r-- | net/ipv6/exthdrs.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index de96e1a555d5..82a344493502 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -653,6 +653,14 @@ EXPORT_SYMBOL_GPL(ipv6_invert_rthdr); Hop-by-hop options. **********************************/ +/* + * Note: we cannot rely on skb->dst before we assign it in ip6_route_input(). + */ +static inline struct inet6_dev *ipv6_skb_idev(struct sk_buff *skb) +{ + return skb->dst ? ip6_dst_idev(skb->dst) : __in6_dev_get(skb->dev); +} + /* Router Alert as of RFC 2711 */ static int ipv6_hop_ra(struct sk_buff **skbp, int optoff) @@ -679,25 +687,25 @@ static int ipv6_hop_jumbo(struct sk_buff **skbp, int optoff) if (skb->nh.raw[optoff+1] != 4 || (optoff&3) != 2) { LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n", skb->nh.raw[optoff+1]); - IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), + IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); goto drop; } pkt_len = ntohl(*(__be32*)(skb->nh.raw+optoff+2)); if (pkt_len <= IPV6_MAXPLEN) { - IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS); + IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff+2); return 0; } if (skb->nh.ipv6h->payload_len) { - IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INHDRERRORS); + IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INHDRERRORS); icmpv6_param_prob(skb, ICMPV6_HDR_FIELD, optoff); return 0; } if (pkt_len > skb->len - sizeof(struct ipv6hdr)) { - IP6_INC_STATS_BH(ip6_dst_idev(skb->dst), IPSTATS_MIB_INTRUNCATEDPKTS); + IP6_INC_STATS_BH(ipv6_skb_idev(skb), IPSTATS_MIB_INTRUNCATEDPKTS); goto drop; } |