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-rw-r--r--block/blk-mq-debugfs.c8
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;