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authorStefano Brivio <sbrivio@redhat.com>2018-10-24 14:37:21 +0200
committerDavid S. Miller <davem@davemloft.net>2018-10-26 15:58:06 -0700
commitee1abcf689353f36d9322231b4320926096bdee0 (patch)
tree1bde8b8c9a0bfd7ab402c611cb49c29d14f7d939 /net
parentbf4cc40e9343bbe6c7400ff6f4feb46fb9338087 (diff)
downloadlinux-ee1abcf689353f36d9322231b4320926096bdee0.tar.gz
ipv6/ndisc: Preserve IPv6 control buffer if protocol error handlers are called
Commit a61bbcf28a8c ("[NET]: Store skb->timestamp as offset to a base timestamp") introduces a neighbour control buffer and zeroes it out in ndisc_rcv(), as ndisc_recv_ns() uses it. Commit f2776ff04722 ("[IPV6]: Fix address/interface handling in UDP and DCCP, according to the scoping architecture.") introduces the usage of the IPv6 control buffer in protocol error handlers (e.g. inet6_iif() in present-day __udp6_lib_err()). Now, with commit b94f1c0904da ("ipv6: Use icmpv6_notify() to propagate redirect, instead of rt6_redirect()."), we call protocol error handlers from ndisc_redirect_rcv(), after the control buffer is already stolen and some parts are already zeroed out. This implies that inet6_iif() on this path will always return zero. This gives unexpected results on UDP socket lookup in __udp6_lib_err(), as we might actually need to match sockets for a given interface. Instead of always claiming the control buffer in ndisc_rcv(), do that only when needed. Fixes: b94f1c0904da ("ipv6: Use icmpv6_notify() to propagate redirect, instead of rt6_redirect().") Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ndisc.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index a25cfdd47c89..659ecf4e4b3c 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -1732,10 +1732,9 @@ int ndisc_rcv(struct sk_buff *skb)
return 0;
}
- memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
-
switch (msg->icmph.icmp6_type) {
case NDISC_NEIGHBOUR_SOLICITATION:
+ memset(NEIGH_CB(skb), 0, sizeof(struct neighbour_cb));
ndisc_recv_ns(skb);
break;