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[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>
This commit is contained in:
YOSHIFUJI Hideaki 2007-05-09 14:01:59 -07:00 committed by David S. Miller
parent 5bb1ab09e4
commit e76b2b2567
1 changed files with 12 additions and 4 deletions
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16
net/ipv6/exthdrs.c
View File

@ -660,6 +660,14 @@ 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)
@ -688,25 +696,25 @@ static int ipv6_hop_jumbo(struct sk_buff **skbp, int optoff)
if (nh[optoff + 1] != 4 || (optoff & 3) != 2) {
LIMIT_NETDEBUG(KERN_DEBUG "ipv6_hop_jumbo: wrong jumbo opt length/alignment %d\n",
nh[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 *)(nh + 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 (ipv6_hdr(skb)->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;
}