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| author | Oleg Nesterov <oleg@tv-sign.ru> | 2007-10-23 15:08:21 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2007-10-29 11:33:05 +0100 |
| commit | 0a0836a09ca7a27341703ef154c82e2e7f3e96f4 (patch) | |
| tree | d4fb7c2a848e7160945405dd3d1bdcf9ae6efd33 /block/cfq-iosched.c | |
| parent | abbeb88d00bef294ce661a9229c1dc31be064545 (diff) | |
| download | linux-0a0836a09ca7a27341703ef154c82e2e7f3e96f4.tar.gz linux-0a0836a09ca7a27341703ef154c82e2e7f3e96f4.tar.bz2 linux-0a0836a09ca7a27341703ef154c82e2e7f3e96f4.zip | |
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>
Diffstat (limited to 'block/cfq-iosched.c')
| -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 d77c9719b613..e47a9309eb48 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 |