linux-kernel - Re: [PATCH v2 1/5] MPI: fix off by one in mpi_read_raw_from

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Date:	Mon, 19 Oct 2015 16:25:29 -0700
From:	Tadeusz Struk <tadeusz.struk@...el.com>
To:	Stephan Mueller <smueller@...onox.de>, herbert@...dor.apana.org.au
Cc:	linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Subject: Re: [PATCH v2 1/5] MPI: fix off by one in mpi_read_raw_from_sgl

On 10/18/2015 03:45 AM, Stephan Mueller wrote:
> The patch fixes the analysis of the input data which contains an off
> by one.
> 
> The issue is visible when the SGL contains one byte per SG entry.
> The code for checking for zero bytes does not operate on the data byte.
> 
> Signed-off-by: Stephan Mueller <smueller@...onox.de>
> ---
>  lib/mpi/mpicoder.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/mpi/mpicoder.c b/lib/mpi/mpicoder.c
> index c20ef27..c7e0a70 100644
> --- a/lib/mpi/mpicoder.c
> +++ b/lib/mpi/mpicoder.c
> @@ -446,8 +446,11 @@ MPI mpi_read_raw_from_sgl(struct scatterlist *sgl, unsigned int len)
>  		const u8 *buff = sg_virt(sg);
>  		int len = sg->length;
>  
> -		while (len-- && !*buff++)
> +		while (len && !*buff) {
>  			lzeros++;
> +			len--;
> +			buff++;
> +		}
>  
>  		if (len && *buff)
>  			break;

ACK. Thanks for testing this Stephan.
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