linux-kernel - Re: [PATCH][next] reiserfs: bitmap: Assign array

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Date:   Fri, 10 Jul 2020 16:25:31 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>
Cc:     reiserfs-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] reiserfs: bitmap: Assign array_size() to a variable

Hi all,

Friendly ping: who can take this?

Thanks
--
Gustavo

On 6/16/20 13:41, Gustavo A. R. Silva wrote:
> Assign array_size() to variable _size_ and use it in both vmalloc()
> and memset(). These sorts of multiplication factors need to be wrapped
> in array_size().
> 
> This issue was found with the help of Coccinelle and, audited and fixed
> manually.
> 
> Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
> Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
> ---
>  fs/reiserfs/bitmap.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
> index bf708ac287b4..3ca601893d2e 100644
> --- a/fs/reiserfs/bitmap.c
> +++ b/fs/reiserfs/bitmap.c
> @@ -1455,12 +1455,13 @@ int reiserfs_init_bitmap_cache(struct super_block *sb)
>  {
>  	struct reiserfs_bitmap_info *bitmap;
>  	unsigned int bmap_nr = reiserfs_bmap_count(sb);
> +	size_t size = array_size(bmap_nr, sizeof(*bitmap));
>  
> -	bitmap = vmalloc(array_size(bmap_nr, sizeof(*bitmap)));
> +	bitmap = vmalloc(size);
>  	if (bitmap == NULL)
>  		return -ENOMEM;
>  
> -	memset(bitmap, 0xff, sizeof(*bitmap) * bmap_nr);
> +	memset(bitmap, 0xff, size);
>  
>  	SB_AP_BITMAP(sb) = bitmap;
>  
>