cfq_get_queue()->cfq_find_alloc_queue() can fail, check the returned value.
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
--- K/block/cfq-iosched.c~3_get 2007-10-20 15:48:35.000000000 +0400
+++ K/block/cfq-iosched.c 2007-10-20 17:05:30.000000000 +0400
@@ -1443,8 +1443,11 @@ cfq_get_queue(struct cfq_data *cfqd, int
cfqq = *async_cfqq;
}
- if (!cfqq)
+ if (!cfqq) {
cfqq = cfq_find_alloc_queue(cfqd, is_sync, tsk, gfp_mask);
+ if (!cfqq)
+ return NULL;
+ }
/*
* pin the queue now that it's allocated, scheduler exit will prune it
-
