linux-kernel - [patch 1/2] memstick: use after free in msb_disk

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Date:	Sat, 29 Sep 2012 10:11:04 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <axboe@...nel.dk>
Subject: [patch 1/2] memstick: use after free in msb_disk_release()

The original code dereferenced "msb" after freeing it.

Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/memstick/core/ms_block.c b/drivers/memstick/core/ms_block.c
index c815fe5..a8e8915 100644
--- a/drivers/memstick/core/ms_block.c
+++ b/drivers/memstick/core/ms_block.c
@@ -1983,9 +1983,9 @@ static int msb_disk_release(struct gendisk *disk)
 			msb->usage_count--;
 
 		if (!msb->usage_count) {
-			kfree(msb);
 			disk->private_data = NULL;
 			idr_remove(&msb_disk_idr, msb->disk_id);
+			kfree(msb);
 			put_disk(disk);
 		}
 	}
--
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