linux-kernel - Re: [PATCH] soundwire: stream: fix out of boundary access on port properties

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Date:   Wed, 22 May 2019 11:37:01 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        vkoul@...nel.org
Cc:     sanyog.r.kale@...el.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] soundwire: stream: fix out of boundary access on port
 properties



On 5/22/19 11:24 AM, Srinivas Kandagatla wrote:
> Assigning local iterator to array element and using it again for
> indexing would cross the array boundary.
> Fix this by directly referring array element without using the local
> variable.

The change is valid and indeed the code could never work as is. I 
vaguely recall providing this feedback as well in an earlier version.

Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>

> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>   drivers/soundwire/stream.c | 4 +---
>   1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/soundwire/stream.c b/drivers/soundwire/stream.c
> index d01060dbee96..544925ff0b40 100644
> --- a/drivers/soundwire/stream.c
> +++ b/drivers/soundwire/stream.c
> @@ -1406,9 +1406,7 @@ struct sdw_dpn_prop *sdw_get_slave_dpn_prop(struct sdw_slave *slave,
>   	}
>   
>   	for (i = 0; i < num_ports; i++) {
> -		dpn_prop = &dpn_prop[i];
> -
> -		if (dpn_prop->num == port_num)
> +		if (dpn_prop[i].num == port_num)
>   			return &dpn_prop[i];
>   	}
>   
>