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Date:	Fri,  1 Nov 2013 19:36:09 +0530
From:	Rashika Kheria <>
To:, Minchan Kim <>,
	Greg Kroah-Hartman <>,
	Jiang Liu <>,
	Nitin Gupta <>,
	Jerome Marchand <>,
Subject: [PATCH v10] Staging: zram: Fix memory leak by refcount mismatch

As suggested by Minchan Kim and Jerome Marchand "The code in reset_store
get the block device (bdget_disk()) but it does not put it (bdput()) when
it's done using it. The usage count is therefore incremented but never

This patch also puts bdput() for all error cases.

Acked-by: Minchan Kim <>
Acked-by: Jerome Marchand <>
Signed-off-by: Rashika Kheria <>

This revision fixes the following issue of the previous revision-
Incorrect Subject Line

 drivers/staging/zram/zram_drv.c |   19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/drivers/staging/zram/zram_drv.c b/drivers/staging/zram/zram_drv.c
index 012ba15..a1f8b1f 100644
--- a/drivers/staging/zram/zram_drv.c
+++ b/drivers/staging/zram/zram_drv.c
@@ -652,21 +652,30 @@ static ssize_t reset_store(struct device *dev,
 		return -ENOMEM;
 	/* Do not reset an active device! */
-	if (bdev->bd_holders)
-		return -EBUSY;
+	if (bdev->bd_holders) {
+		ret = -EBUSY;
+		goto out;
+	}
 	ret = kstrtou16(buf, 10, &do_reset);
 	if (ret)
-		return ret;
+		goto out;
-	if (!do_reset)
-		return -EINVAL;
+	if (!do_reset) {
+		ret = -EINVAL;
+		goto out;
+	}
 	/* Make sure all pending I/O is finished */
+	bdput(bdev);
 	zram_reset_device(zram, true);
 	return len;
+	bdput(bdev);
+	return ret;
 static void __zram_make_request(struct zram *zram, struct bio *bio, int rw)

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