From: David S. Miller <davem@davemloft.net>
Date: Fri, 11 May 2012 02:16:32 +0000 (-0400)
Subject: ipv4: Do not use dead fib_info entries.
X-Git-Tag: v3.4-rc7~4^2~10
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=dccd9ecc374462e5d6a5b8f8110415a86c2213d8;p=platform%2Fkernel%2Flinux-exynos.git

ipv4: Do not use dead fib_info entries.

Due to RCU lookups and RCU based release, fib_info objects can
be found during lookup which have fi->fib_dead set.

We must ignore these entries, otherwise we risk dereferencing
the parts of the entry which are being torn down.

Reported-by: Yevgen Pronenko <yevgen.pronenko@sonymobile.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index bce36f1a37b4..30b88d7b4bd6 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1370,6 +1370,8 @@ static int check_leaf(struct fib_table *tb, struct trie *t, struct leaf *l,
 
 			if (fa->fa_tos && fa->fa_tos != flp->flowi4_tos)
 				continue;
+			if (fi->fib_dead)
+				continue;
 			if (fa->fa_info->fib_scope < flp->flowi4_scope)
 				continue;
 			fib_alias_accessed(fa);