[patch 21/47] ipsec: Use the correct ip_local_out function

Greg KH
2008-06-14T00:19:24Z

[-- Attachment #1: ipsec-use-the-correct-ip_local_out-function.patch --]
[-- Type: text/plain, Size: 1824 bytes --]

-stable review patch. If anyone has any objections, please let us know.

------------------
From: Herbert Xu <herbert@gondor.apana.org.au>

[ upstream commit: 1ac06e0306d0192a7a4d9ea1c9e06d355ce7e7d3 ]

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>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
---
net/ipv4/route.c | 2 +-
net/ipv6/route.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -162,7 +162,7 @@ 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),
};
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -105,7 +105,7 @@ static struct dst_ops ip6_dst_ops = {
.negative_advice = ip6_negative_advice,
.link_failure = ip6_link_failure,
.update_pmtu = ip6_rt_update_pmtu,
- .local_out = ip6_local_out,
+ .local_out = __ip6_local_out,
.entry_size = sizeof(struct rt6_info),
.entries = ATOMIC_INIT(0),
};

--