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 <[email protected]> Tested-by: Scot Doyle <[email protected]> Signed-off-by: Eric Dumazet <[email protected]> Cc: Stephen Hemminger <[email protected]> Acked-by: Hiroaki SHIMODA <[email protected]> Signed-off-by: David S. Miller <[email protected]>
kawasaki · Apr 15, 2011 · c65353d · c65353d
1 parent 49b4947
commit c65353d
Showing 1 changed file with 3 additions and 3 deletions.
diff --git 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)