From c532115a11eb1742ff53ed821685d8d975e2af0f Mon Sep 17 00:00:00 2001
From: Robert Stepanek <rsto@fastmailteam.com>
Date: Mon, 14 Oct 2019 17:43:18 +0200
Subject: [PATCH] hash: gracefully handle lookup on zero-sized tables

---
 lib/hash.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/hash.c b/lib/hash.c
index bdf11507bc..ba1d4b132c 100644
--- a/lib/hash.c
+++ b/lib/hash.c
@@ -157,9 +157,14 @@ void *hash_insert(const char *key, void *data, hash_table *table)
 
 void *hash_lookup(const char *key, hash_table *table)
 {
-      unsigned val = strhash(key) % table->size;
+      unsigned val;
       bucket *ptr;
 
+      if (!table->size)
+          return NULL;
+
+      val = strhash(key) % table->size;
+
       if (!(table->table)[val])
             return NULL;