ipsec: Use the correct ip_local_out function

Because the IPsec output function xfrm_output_resume does its
own dst_output call it should always call __ip_local_output
instead of ip_local_output as the latter may invoke dst_output
directly.  Otherwise the return values from nf_hook and dst_output
may clash as they both use the value 1 but for different purposes.

When that clash occurs this can cause a packet to be used after
it has been freed which usually leads to a crash.  Because the
offending value is only returned from dst_output with qdiscs
such as HTB, this bug is normally not visible.

Thanks to Marco Berizzi for his perseverance in tracking this
down.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 92f90ae46f4a..df41026b60db 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -160,7 +160,7 @@ static struct dst_ops ipv4_dst_ops = {
         .negative_advice =      ipv4_negative_advice,
         .link_failure =         ipv4_link_failure,
         .update_pmtu =          ip_rt_update_pmtu,
-        .local_out =            ip_local_out,
+        .local_out =            __ip_local_out,
         .entry_size =           sizeof(struct rtable),
         .entries =              ATOMIC_INIT(0),
 };