ipv4: Fix error return code in fib_table_insert()

[ Upstream commit 568fe84940ac0e4e0b2cd7751b8b4911f7b9c215 ]

In fib_table_insert(), if the alias was already inserted, but node not
exist, the error code should be set before return from error handling path.

Fixes: a6c76c17df02 ("ipv4: Notify route after insertion to the routing table")
Signed-off-by: Ziyang Xuan <william.xuanziyang@huawei.com>
Link: https://lore.kernel.org/r/20221120072838.2167047-1-william.xuanziyang@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/net/ipv4/fib_trie.c b/net/ipv4/fib_trie.c
index 19c6e7b93d3d8c27ae8ae7cb2d3d081799226778..52f9f69f57b32c6372f8c32796b39754ec16d8ac 100644 (file)
--- a/net/ipv4/fib_trie.c
+++ b/net/ipv4/fib_trie.c
@@ -1375,8 +1375,10 @@ int fib_table_insert(struct net *net, struct fib_table *tb,
 
        /* The alias was already inserted, so the node must exist. */
        l = l ? l : fib_find_node(t, &tp, key);
-       if (WARN_ON_ONCE(!l))
+       if (WARN_ON_ONCE(!l)) {
+               err = -ENOENT;
                goto out_free_new_fa;
+       }
 
        if (fib_find_alias(&l->leaf, new_fa->fa_slen, 0, 0, tb->tb_id, true) ==
            new_fa) {