diff options
Diffstat (limited to 'block/blk-mq-debugfs.c')
| -rw-r--r-- | block/blk-mq-debugfs.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 1579af6fcbed..347fbb8e059c 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -102,6 +102,14 @@ static ssize_t queue_state_write(void *data, const char __user *buf, struct request_queue *q = data; char opbuf[16] = { }, *op; + /* + * The "state" attribute is removed after blk_cleanup_queue() has called + * blk_mq_free_queue(). Return if QUEUE_FLAG_DEAD has been set to avoid + * triggering a use-after-free. + */ + if (blk_queue_dead(q)) + return -ENOENT; + if (count >= sizeof(opbuf)) { pr_err("%s: operation too long\n", __func__); goto inval; |