From: Sven Eckelmann <sven.eckelmann@openmesh.com>
Date: Thu, 23 Nov 2017 15:04:36 +0100
Subject: batctl: Handle failure during hash_iterator allocation

The iterator functions should not try to start the iteration when the
iterator could not be allocated.

Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

Origin: upstream, https://git.open-mesh.org/batctl.git/commit/aa316bf6d1b2cf0ab7189ed8620c17f5018d4d37

diff --git a/hash.c b/hash.c
index 08d47b5b8f812d718f9463c548d73fbffb49b1b3..c6f735c64b573928441b41936646d195bc0da4bb 100644
--- a/hash.c
+++ b/hash.c
@@ -120,6 +120,9 @@ struct hash_it_t *hash_iterate(struct hashtable_t *hash,
 
 	if (iter_in == NULL) {
 		iter = debugMalloc(sizeof(struct hash_it_t), 301);
+		if (!iter)
+			return NULL;
+
 		iter->index =  -1;
 		iter->bucket = NULL;
 		iter->prev_bucket = NULL;