hashtbl: make hash_iterate() not crash on an uninitalized table

Trying to walk an uninitialized table (->table == NULL) should just
return nothing.  This can happen due when pp_cleanup() is called after
a failure.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/hashtbl.c b/hashtbl.c
index a733f455..99af8b8c 100644
--- a/hashtbl.c
+++ b/hashtbl.c
@@ -156,8 +156,11 @@ void *hash_iterate(const struct hash_table *head,
     struct hash_tbl_node *np = *iterator;
     struct hash_tbl_node *ep = head->table + head->size;
 
-    if (!np)
+    if (!np) {
 	np = head->table;
+	if (!np)
+	    return NULL;	/* Uninitialized table */
+    }
 
     while (np < ep) {
 	if (np->key) {