Commit dccd9ecc authored May 10, 2012 by David S. Miller

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>

parent 0e0c5516

net/ipv4/fib_trie.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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);