linux-kernel - [PATCH 4.19 06/41] mtd: nand: Fix memory allocation in nanddev_bbt

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Message-Id: <20181206142950.228646871@linuxfoundation.org>
Date:   Thu,  6 Dec 2018 15:38:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Frieder Schrempf <frieder.schrempf@...tron.de>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>
Subject: [PATCH 4.19 06/41] mtd: nand: Fix memory allocation in nanddev_bbt_init()

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Frieder Schrempf <frieder.schrempf@...tron.de>

commit 40b412897ccb4b98b2cfb2a0aaabed58dd9e2086 upstream.

Fix the size of the buffer allocated to store the in-memory BBT.
This bug was previously hidden by a different bug, that was fixed in
commit d098093ba06e ("mtd: nand: Fix nanddev_neraseblocks()").

Fixes: 9c3736a3de21 ("mtd: nand: Add core infrastructure to deal with NAND devices")
Cc: <stable@...r.kernel.org>
Signed-off-by: Frieder Schrempf <frieder.schrempf@...tron.de>
Acked-by: Miquel Raynal <miquel.raynal@...tlin.com>
Signed-off-by: Boris Brezillon <boris.brezillon@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mtd/nand/bbt.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/mtd/nand/bbt.c
+++ b/drivers/mtd/nand/bbt.c
@@ -27,7 +27,8 @@ int nanddev_bbt_init(struct nand_device
 	unsigned int nwords = DIV_ROUND_UP(nblocks * bits_per_block,
 					   BITS_PER_LONG);
 
-	nand->bbt.cache = kzalloc(nwords, GFP_KERNEL);
+	nand->bbt.cache = kcalloc(nwords, sizeof(*nand->bbt.cache),
+				  GFP_KERNEL);
 	if (!nand->bbt.cache)
 		return -ENOMEM;