From 8406a4d56ea94d1d91f62cab3bed15399bac73cb Mon Sep 17 00:00:00 2001
From: Chao Yu <chao2.yu@samsung.com>
Date: Thu, 23 Apr 2015 10:47:44 -0600
Subject: [PATCH] elevator: fix double release of elevator module
Our issue is descripted in below call path:
->elevator_init
->elevator_init_fn
->{cfq,deadline,noop}_init_queue
->elevator_alloc
->kzalloc_node
fail to call kzalloc_node and then put module in elevator_alloc;
fail to call elevator_init_fn and then put module again in elevator_init.
Remove elevator_put invoking in error path of elevator_alloc to avoid
double release issue.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
---
block/elevator.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)
diff --git a/block/elevator.c b/block/elevator.c
index 59794d0d38e34..8985038f398ce 100644
--- a/block/elevator.c
+++ b/block/elevator.c
@@ -157,7 +157,7 @@ struct elevator_queue *elevator_alloc(struct request_queue *q,
eq = kzalloc_node(sizeof(*eq), GFP_KERNEL, q->node);
if (unlikely(!eq))
- goto err;
+ return NULL;
eq->type = e;
kobject_init(&eq->kobj, &elv_ktype);
@@ -165,10 +165,6 @@ struct elevator_queue *elevator_alloc(struct request_queue *q,
hash_init(eq->hash);
return eq;
-err:
- kfree(eq);
- elevator_put(e);
- return NULL;
}
EXPORT_SYMBOL(elevator_alloc);
--
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