linux-kernel - [PATCH 1/4] mtd: block2mtd: char mtd major check

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Message-Id: <20140123204947.fc1c03dc0a1624d3347b3837@skynet.be>
Date:	Thu, 23 Jan 2014 20:49:47 +0100
From:	Fabian Frederick <fabf@...net.be>
To:	linux-mtd@...ts.infradead.org
Cc:	akpm@...ux-foundation.org, rdunlap@...radead.org,
	joern@...ybastard.org, linux-kernel@...r.kernel.org,
	ezequiel.garcia@...e-electrons.com
Subject: [PATCH 1/4] mtd: block2mtd: char mtd major check

Deny use of a char mtd device to map as a block device.

Signed-off-by: Fabian Frederick <fabf@...net.be>
---
 drivers/mtd/devices/block2mtd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/block2mtd.c b/drivers/mtd/devices/block2mtd.c
index d9fd87a..0efee5b 100644
--- a/drivers/mtd/devices/block2mtd.c
+++ b/drivers/mtd/devices/block2mtd.c
@@ -244,7 +244,8 @@ static struct block2mtd_dev *add_device(char *devname, int erase_size)
 	}
 	dev->blkdev = bdev;
 
-	if (MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) {
+	if ((MAJOR(bdev->bd_dev) == MTD_BLOCK_MAJOR) ||
+	    (MAJOR(bdev->bd_dev) == MTD_CHAR_MAJOR)) {
 		pr_err("attempting to use an MTD device as a block device\n");
 		goto devinit_err;
 	}
-- 
1.8.1.4
--
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