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authorEric Dumazet <eric.dumazet@gmail.com>2011-04-14 05:55:37 +0000
committerDavid S. Miller <davem@davemloft.net>2011-04-14 23:26:02 -0700
commitc65353daf137dd41f3ede3baf62d561fca076228 (patch)
tree407488cc052fff615d61c889100a76e057c1f203 /net/ipv4
parent49b4947aae404c8c5758ffd1007d0d78c48b3643 (diff)
downloadlwn-c65353daf137dd41f3ede3baf62d561fca076228.tar.gz
lwn-c65353daf137dd41f3ede3baf62d561fca076228.zip
ip: ip_options_compile() resilient to NULL skb route
Scot Doyle demonstrated ip_options_compile() could be called with an skb without an attached route, using a setup involving a bridge, netfilter, and forged IP packets. Let's make ip_options_compile() and ip_options_rcv_srr() a bit more robust, instead of changing bridge/netfilter code. With help from Hiroaki SHIMODA. Reported-by: Scot Doyle <lkml@scotdoyle.com> Tested-by: Scot Doyle <lkml@scotdoyle.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Stephen Hemminger <shemminger@vyatta.com> Acked-by: Hiroaki SHIMODA <shimoda.hiroaki@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ip_options.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index 28a736f3442f..2391b24e8251 100644
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -329,7 +329,7 @@ int ip_options_compile(struct net *net,
pp_ptr = optptr + 2;
goto error;
}
- if (skb) {
+ if (rt) {
memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4);
opt->is_changed = 1;
}
@@ -371,7 +371,7 @@ int ip_options_compile(struct net *net,
goto error;
}
opt->ts = optptr - iph;
- if (skb) {
+ if (rt) {
memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4);
timeptr = (__be32*)&optptr[optptr[2]+3];
}
@@ -603,7 +603,7 @@ int ip_options_rcv_srr(struct sk_buff *skb)
unsigned long orefdst;
int err;
- if (!opt->srr)
+ if (!opt->srr || !rt)
return 0;
if (skb->pkt_type != PACKET_HOST)