[net PATCH 2/2] ipv4: Fix memory leak in exception case for splitting tries

[Alexander Duyck]

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 <eduma...@google.com>
Signed-off-by: Alexander Duyck <alexander.h.du...@intel.com>
---
 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 735edc9..026f309 100644
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1743,8 +1743,10 @@ 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 */