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authorDavid S. Miller <davem@davemloft.net>2012-05-10 22:16:32 -0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2012-06-10 00:33:02 +0900
commitf77baf324713ef5d6ae9ae63a77aed2bfbe4333d (patch)
treeea8fd9421579024b5a49ae883fbf75dae21e3901 /net/ipv4
parent166ab4d1f2a1fae8f2cbe43da0e35befadc1e90b (diff)
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ipv4: Do not use dead fib_info entries.
[ Upstream commit dccd9ecc374462e5d6a5b8f8110415a86c2213d8 ] 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv4')
-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 58c25ea..0d884eb 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1371,6 +1371,8 @@ 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);