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fix rare condition where 'key' would already be destroyed while is was needed later on

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This commit is contained in:
Pieter Noordhuis
2010-07-22 15:55:41 +02:00
parent b25b61eb97
commit d8f25ce3ac
1 changed files with 9 additions and 3 deletions
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12
redis.c
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@ -9870,6 +9870,11 @@ static int dontWaitForSwappedKey(redisClient *c, robj *key) {
listIter li;
struct dictEntry *de;
/* The key object might be destroyed when deleted from the c->io_keys
* list (and the "key" argument is physically the same object as the
* object inside the list), so we need to protect it. */
incrRefCount(key);
/* Remove the key from the list of keys this client is waiting for. */
listRewind(c->io_keys,&li);
while ((ln = listNext(&li)) != NULL) {
@ -9878,18 +9883,19 @@ static int dontWaitForSwappedKey(redisClient *c, robj *key) {
break;
}
}
assert(ln != NULL);
redisAssert(ln != NULL);
/* Remove the client form the key => waiting clients map. */
de = dictFind(c->db->io_keys,key);
assert(de != NULL);
redisAssert(de != NULL);
l = dictGetEntryVal(de);
ln = listSearchKey(l,c);
assert(ln != NULL);
redisAssert(ln != NULL);
listDelNode(l,ln);
if (listLength(l) == 0)
dictDelete(c->db->io_keys,key);
decrRefCount(key);
return listLength(c->io_keys) == 0;
}