linux-kernel - Re: [PATCH] hfs: fix array out of bounds read of array extent

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Date:   Wed, 17 Oct 2018 14:49:54 -0300
From:   Ernesto A. Fernández 
        <ernesto.mnd.fernandez@...il.com>
To:     Colin King <colin.king@...onical.com>
Cc:     linux-fsdevel@...r.kernel.org, dhowells@...hat.com,
        viro@...iv.linux.org.uk, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] hfs: fix array out of bounds read of array extent

On Fri, Aug 31, 2018 at 03:05:38PM +0100, Colin King wrote:
> From: Colin Ian King <colin.king@...onical.com>
> 
> Currently extent and index i are both being incremented causing
> an array out of bounds read on extent[i]. Fix this by removing
> the extraneous increment of extent.
> 
> Detected by CoverityScan, CID#711541 ("Out of bounds read")
> 
> Fixes: d1081202f1d0 ("HFS rewrite")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>

I don't think this got picked up yet; let's see if I can help.

Reviewed-by: Ernesto A. Fernández <ernesto.mnd.fernandez@...il.com>

> ---
>  fs/hfs/extent.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/hfs/extent.c b/fs/hfs/extent.c
> index 5d0182654580..636cdfcecb26 100644
> --- a/fs/hfs/extent.c
> +++ b/fs/hfs/extent.c
> @@ -300,7 +300,7 @@ int hfs_free_fork(struct super_block *sb, struct hfs_cat_file *file, int type)
>  		return 0;
>  
>  	blocks = 0;
> -	for (i = 0; i < 3; extent++, i++)
> +	for (i = 0; i < 3; i++)
>  		blocks += be16_to_cpu(extent[i].count);
>  
>  	res = hfs_free_extents(sb, extent, blocks, blocks);
> -- 
> 2.17.1
>