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mtd: nand: fix pointer NULL pointer dereferencing 

In 'verify_bbt_descr()', first check the "bd" pointer, then
dereference it.

Comments amended by Artem.

Signed-off-by: Stanislav Fomichev <kernel@fomichev.me>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Stanislav Fomichev 2011-02-07 23:48:25 +03:00 committed by David Woodhouse
parent 7b7e905ec2
commit 7912a5e7f3
1 changed files with 6 additions and 2 deletions
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8
drivers/mtd/nand/nand_bbt.c
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@ -1101,12 +1101,16 @@ 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 pattern_len;
u32 bits;
u32 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);