linux-kernel - [PATCH] mtd: nand: Fixed null pointer dereference.

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Date:	Wed, 16 Mar 2011 15:47:55 +0100
From:	Maarten ter Huurne <maarten@...ewalker.org>
To:	Artem Bityutskiy <dedekind1@...il.com>
Cc:	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Maarten ter Huurne <maarten@...ewalker.org>
Subject: [PATCH] mtd: nand: Fixed null pointer dereference.

The "bd" argument of verify_bbt_descr() was dereferenced before it was checked for NULL.

Signed-off-by: Maarten ter Huurne <maarten@...ewalker.org>
---
 drivers/mtd/nand/nand_bbt.c |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/nand_bbt.c b/drivers/mtd/nand/nand_bbt.c
index 6ebd869..fc05f51 100644
--- a/drivers/mtd/nand/nand_bbt.c
+++ b/drivers/mtd/nand/nand_bbt.c
@@ -1101,12 +1101,14 @@ static void mark_bbt_region(struct mtd_info *mtd, struct nand_bbt_descr *td)
 static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd)
 {
 	struct nand_chip *this = mtd->priv;
-	u32 pattern_len = bd->len;
-	u32 bits = bd->options & NAND_BBT_NRBITS_MSK;
-	u32 table_size;
+	u32 pattern_len, bits, table_size;
 
 	if (!bd)
 		return;
+
+	pattern_len = bd->len;
+	bits = bd->options & NAND_BBT_NRBITS_MSK;
+
 	BUG_ON((this->options & NAND_USE_FLASH_BBT_NO_OOB) &&
 			!(this->options & NAND_USE_FLASH_BBT));
 	BUG_ON(!bits);
-- 
1.7.1

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