Subject: [PATCH 32/34] ipv4: Fix memory leak in exception case for splitting tries

From: Alexander Duyck <[email-masked]>
Date: Tue, 15 Nov 2016 05:46:12 -0500

[ Upstream commit 3114cdfe66c156345b0ae34e2990472f277e0c1b ]

Fix a small memory leak that can occur where we leak a fib_alias in the
event of us not being able to insert it into the local table.

Fixes: 0ddcf43d5d4a0 ("ipv4: FIB Local/MAIN table collapse")
Reported-by: Eric Dumazet <[email-masked]>
Signed-off-by: Alexander Duyck <[email-masked]>
Acked-by: Eric Dumazet <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/ipv4/fib_trie.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 7ef7031..79ff363 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1713,8 +1713,10 @@ struct fib_table *fib_trie_unmerge(struct fib_table *oldtb)
 				local_l = fib_find_node(lt, &local_tp, l->key);
 
 			if (fib_insert_alias(lt, local_tp, local_l, new_fa,
-					     NULL, l->key))
+					     NULL, l->key)) {
+				kmem_cache_free(fn_alias_kmem, new_fa);
 				goto out;
+			}
 		}
 
 		/* stop loop if key wrapped back to 0 */
-- 
2.7.4