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authorDavid S. Miller <davem@davemloft.net>2012-05-10 22:16:32 -0400
committerDavid S. Miller <davem@davemloft.net>2012-05-10 22:16:32 -0400
commitdccd9ecc374462e5d6a5b8f8110415a86c2213d8 (patch)
tree92985101d752308885e7b29678dc9845eabea0d6
parent0e0c55165b638e96c8d7097ea638aa368daa268a (diff)
downloadlinux-dccd9ecc374462e5d6a5b8f8110415a86c2213d8.tar.bz2
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>
-rw-r--r--net/ipv4/fib_trie.c2
1 files changed, 2 insertions, 0 deletions
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);