From 3c051235a7f115c34e675c9cf55820bd3435f860 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Fri, 18 Apr 2008 01:46:19 -0700 Subject: [PATCH] [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 --- net/ipv6/ip6_fib.c | 4 ++++ 1 file changed, 4 insertions(+) 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 -- 2.20.1