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authorDavid S. Miller <davem@davemloft.net>2008-04-18 01:46:19 -0700
committerDavid S. Miller <davem@davemloft.net>2008-04-18 01:46:19 -0700
commit3c051235a7f115c34e675c9cf55820bd3435f860 (patch)
tree85fd6bf395a8bf5934bd278f6354b1e94110a51f /net
parent1e42198609d73ed1a9adcba2af275c24c2678420 (diff)
downloadlinux-3c051235a7f115c34e675c9cf55820bd3435f860.tar.bz2
[IPV6]: Fix dangling references on error in fib6_add().
Fixes bugzilla #8895 If a super-tree leaf has 'rt' assigned to it and we get an error from fib6_add_rt2node(), we'll leave a reference to 'rt' in pn->leaf and then do an unconditional dst_free(). We should prune such references. Based upon a report by Vincent Perrier. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv6/ip6_fib.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index b3f6e03c454c..50f3f8f8a59b 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -772,6 +772,10 @@ out:
* If fib6_add_1 has cleared the old leaf pointer in the
* super-tree leaf node we have to find a new one for it.
*/
+ if (pn != fn && pn->leaf == rt) {
+ pn->leaf = NULL;
+ atomic_dec(&rt->rt6i_ref);
+ }
if (pn != fn && !pn->leaf && !(pn->fn_flags & RTN_RTINFO)) {
pn->leaf = fib6_find_prefix(info->nl_net, pn);
#if RT6_DEBUG >= 2