linux-kernel - Re: [PATCH 4/4] iio: dht11: Fix out-of-bounds read

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Date:	Sun, 14 Dec 2014 13:32:07 +0100
From:	Hartmut Knaack <knaack.h@....de>
To:	Richard Weinberger <richard@....at>, jic23@...nel.org
CC:	harald@...ib.org, lars@...afoo.de, pmeerw@...erw.net,
	sanjeev_sharma@...tor.com, linux-iio@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] iio: dht11: Fix out-of-bounds read

Richard Weinberger schrieb am 03.12.2014 um 00:32:
> As we access i-1 we must not start with i=0.
> 
> Signed-off-by: Richard Weinberger <richard@....at>
Acked-by: Hartmut Knaack <knaack.h@....de>
> ---
>  drivers/iio/humidity/dht11.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/humidity/dht11.c b/drivers/iio/humidity/dht11.c
> index fbcd7cb..5dfe71b 100644
> --- a/drivers/iio/humidity/dht11.c
> +++ b/drivers/iio/humidity/dht11.c
> @@ -90,7 +90,7 @@ static int dht11_decode(struct dht11 *dht11, int offset)
>  	unsigned char temp_int, temp_dec, hum_int, hum_dec, checksum;
>  
>  	/* Calculate timestamp resolution */
> -	for (i = 0; i < dht11->num_edges; ++i) {
> +	for (i = 1; i < dht11->num_edges; ++i) {
>  		t = dht11->edges[i].ts - dht11->edges[i-1].ts;
>  		if (t > 0 && t < timeres)
>  			timeres = t;
> 

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