From 5b675efaef119656d5997f0b67cf9e620eb1765a Mon Sep 17 00:00:00 2001
From: Alex Rousskov <rousskov@measurement-factory.com>
Date: Thu, 17 Dec 2015 21:30:52 -0700
Subject: [PATCH] Squid with a misconfigured (too-small) shared memory cache
 might crash upon startup.

Controller condition for allocating MemStore is slightly different from
MemStore condition for allocating MemStore::map, resulting in MemStore
without a map. Until that discrepancy is fixed, be careful when
dereferencing MemStore::map.
---
 src/MemStore.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/MemStore.cc b/src/MemStore.cc
index a23325005d..f30d2c4ddf 100644
--- a/src/MemStore.cc
+++ b/src/MemStore.cc
@@ -705,7 +705,7 @@ MemStore::unlink(StoreEntry &e)
     if (e.mem_obj && e.mem_obj->memCache.index >= 0) {
         map->freeEntry(e.mem_obj->memCache.index);
         disconnect(e);
-    } else {
+    } else if (map) {
         // the entry may have been loaded and then disconnected from the cache
         map->freeEntryByKey(reinterpret_cast<cache_key*>(e.key));
     }
-- 
2.47.3