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Commit 83c59542 authored by Brian Norris's avatar Brian Norris
Browse files

mtd: nand_bbt: unify/fix error handling in nand_scan_bbt() 



Don't leak this->bbt, and return early if check_create() fails. It helps
to have a single error path to avoid these problems.

Signed-off-by: default avatarBrian Norris <computersforpeace@gmail.com>
parent 17799359

drivers/mtd/nand/nand_bbt.c

+12 −7
Original line number Diff line number Diff line
@@ -1077,7 +1077,7 @@ static void verify_bbt_descr(struct mtd_info *mtd, struct nand_bbt_descr *bd) 
static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)

{

	struct nand_chip *this = mtd->priv;

	int len, res = 0;

	int len, res;

	uint8_t *buf;

	struct nand_bbt_descr *td = this->bbt_td;

	struct nand_bbt_descr *md = this->bbt_md;
@@ -1098,10 +1098,9 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 
	if (!td) {

		if ((res = nand_memory_bbt(mtd, bd))) {

			pr_err("nand_bbt: can't scan flash and build the RAM-based BBT\n");

			kfree(this->bbt);

			this->bbt = NULL;

			goto err;

		}

		return res;

		return 0;

	}

	verify_bbt_descr(mtd, td);

	verify_bbt_descr(mtd, md);
@@ -1111,9 +1110,8 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 
	len += (len >> this->page_shift) * mtd->oobsize;

	buf = vmalloc(len);

	if (!buf) {

		kfree(this->bbt);

		this->bbt = NULL;

		return -ENOMEM;

		res = -ENOMEM;

		goto err;

	}



	/* Is the bbt at a given page? */
@@ -1125,6 +1123,8 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 
	}



	res = check_create(mtd, buf, bd);

	if (res)

		goto err;



	/* Prevent the bbt regions from erasing / writing */

	mark_bbt_region(mtd, td);
@@ -1132,6 +1132,11 @@ static int nand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd) 
		mark_bbt_region(mtd, md);



	vfree(buf);

	return 0;



err:

	kfree(this->bbt);

	this->bbt = NULL;

	return res;

}