block-throttle: set q->td to NULL if blkcg_activate_policy failed

Commit Message

Zheng Bin Aug. 5, 2020, 1:37 p.m. UTC

Otherwise q->td will point to the released memory, although there is
no access to q->td in the following process, still recommend to do this.

Signed-off-by: Zheng Bin <[e-mail]>
---
 block/blk-throttle.c | 1 +
 1 file changed, 1 insertion(+)

--
2.25.4

Patch

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index fee3325edf27..05b87516eee9 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2399,6 +2399,7 @@  int blk_throtl_init(struct request_queue *q)
 		free_percpu(td->latency_buckets[READ]);
 		free_percpu(td->latency_buckets[WRITE]);
 		kfree(td);
+		q->td = NULL;
 	}
 	return ret;
 }