path: root/block/cfq-iosched.c
diff options
authorOleg Nesterov <>2007-10-23 15:08:21 +0200
committerJens Axboe <>2007-10-29 11:33:05 +0100
commit0a0836a09ca7a27341703ef154c82e2e7f3e96f4 (patch)
treed4fb7c2a848e7160945405dd3d1bdcf9ae6efd33 /block/cfq-iosched.c
parentabbeb88d00bef294ce661a9229c1dc31be064545 (diff)
cfq_get_queue: fix possible NULL pointer access
cfq_get_queue()->cfq_find_alloc_queue() can fail, check the returned value. Signed-off-by: Oleg Nesterov <> Note that this isn't a bug at the moment, since the regular IO path does not call this path without __GFP_WAIT set. However, it could be a future bug, so I've applied it. Signed-off-by: Jens Axboe <>
Diffstat (limited to 'block/cfq-iosched.c')
1 files changed, 4 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index d77c9719b61..e47a9309eb4 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -1443,8 +1443,11 @@ cfq_get_queue(struct cfq_data *cfqd, int is_sync, struct task_struct *tsk,
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