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author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-10-23 13:08:21 (GMT) |
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committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-29 10:33:05 (GMT) |
commit | 0a0836a09ca7a27341703ef154c82e2e7f3e96f4 (patch) | |
tree | d4fb7c2a848e7160945405dd3d1bdcf9ae6efd33 | |
parent | abbeb88d00bef294ce661a9229c1dc31be064545 (diff) | |
download | linux-0a0836a09ca7a27341703ef154c82e2e7f3e96f4.tar.xz |
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 <oleg@tv-sign.ru>
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 <jens.axboe@oracle.com>
-rw-r--r-- | block/cfq-iosched.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c index d77c971..e47a930 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 |