[PATCH] mtd: nand: don't leak buffers when ->scan_bbt() fails

[Boris Brezillon]

On Mon,  1 May 2017 17:04:50 -0700
Brian Norris <computersforpeace at gmail.com> wrote:

> This bug seems to have been here forever, although we came close to
> fixing all of them in [1]!
> 
> [1] 11eaf6df1cce ("mtd: nand: Remove BUG() abuse in nand_scan_tail")
> 
> Cc: Ezequiel Garcia <ezequiel at vanguardiasur.com.ar>
> Signed-off-by: Brian Norris <computersforpeace at gmail.com>

Acked-by: Boris Brezillon <boris.brezillon at free-electrons.com>

> ---
> The goto isn't *really* necessary, but I thought it'd be more consistent.
> 
> Compile tested only
> 
>  drivers/mtd/nand/nand_base.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index 978242b1213f..e4919f9dece4 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -4794,7 +4794,11 @@ int nand_scan_tail(struct mtd_info *mtd)
>  		return 0;
>  
>  	/* Build bad block table */
> -	return chip->scan_bbt(mtd);
> +	ret = chip->scan_bbt(mtd);
> +	if (ret)
> +		goto err_free;
> +	return 0;
> +
>  err_free:
>  	if (nbuf) {
>  		kfree(nbuf->databuf);