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Message-Id: <20150304055510.144339643@linuxfoundation.org>
Date: Tue, 3 Mar 2015 22:13:31 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Tony Battersby <tonyb@...ernetics.com>,
Jens Axboe <axboe@...com>
Subject: [PATCH 3.18 077/151] blk-mq: fix double-free in error path
3.18-stable review patch. If anyone has any objections, please let me know.
------------------
From: Tony Battersby <tonyb@...ernetics.com>
commit 564e559f2baf6a868768d0cac286980b3cfd6e30 upstream.
If the allocation of bt->bs fails, then bt->map can be freed twice, once
in blk_mq_init_bitmap_tags() -> bt_alloc(), and once in
blk_mq_init_bitmap_tags() -> bt_free(). Fix by setting the pointer to
NULL after the first free.
Signed-off-by: Tony Battersby <tonyb@...ernetics.com>
Signed-off-by: Jens Axboe <axboe@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
block/blk-mq-tag.c | 1 +
1 file changed, 1 insertion(+)
--- a/block/blk-mq-tag.c
+++ b/block/blk-mq-tag.c
@@ -500,6 +500,7 @@ static int bt_alloc(struct blk_mq_bitmap
bt->bs = kzalloc(BT_WAIT_QUEUES * sizeof(*bt->bs), GFP_KERNEL);
if (!bt->bs) {
kfree(bt->map);
+ bt->map = NULL;
return -ENOMEM;
}
--
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