RE: [PATCH] exfat: Fix pontential use after free in exfat_load_upcase_table()

[Namjae Jeon]

> This code calls brelse(bh) and then dereferences "bh" on the next line resulting in a possible use
> after free.  The brelse() should just be moved down a line.
> 
> Fixes: b676fdbcf4c8 ("exfat: standardize checksum calculation")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Applied. Thanks!
> ---
>  fs/exfat/nls.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c index c1ec056954974..57b5a7a4d1f7a 100644
> --- a/fs/exfat/nls.c
> +++ b/fs/exfat/nls.c
> @@ -692,8 +692,8 @@ static int exfat_load_upcase_table(struct super_block *sb,
>  				index++;
>  			}
>  		}
> -		brelse(bh);
>  		chksum = exfat_calc_chksum32(bh->b_data, i, chksum, CS_DEFAULT);
> +		brelse(bh);
>  	}
> 
>  	if (index >= 0xFFFF && utbl_checksum == chksum)
> --
> 2.26.2