Fix startup crash with a misconfigured (too-small) shared memory cache

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.

diff --git a/src/MemStore.cc b/src/MemStore.cc
index a53ecf6346a3b07433980c431c00bdd7e0346e25..d4bc939448ae9ddd29edb3d1e870329db5b24e8e 100644 (file)
--- a/src/MemStore.cc
+++ b/src/MemStore.cc
@@ -725,7 +725,7 @@ 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));
     }