linux-kernel - Re: [PATCH 4.19 004/321] ASoC: compress: fix unsigned integer overflow check

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Message-ID: <20191204093332.GA7678@amd>
Date:   Wed, 4 Dec 2019 10:33:33 +0100
From:   Pavel Machek <pavel@...x.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Xiaojun Sang <xsang@...eaurora.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Vinod Koul <vkoul@...nel.org>, Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 004/321] ASoC: compress: fix unsigned integer
 overflow check

On Tue 2019-12-03 23:31:10, Greg Kroah-Hartman wrote:
> From: Xiaojun Sang <xsang@...eaurora.org>
> 
> [ Upstream commit d3645b055399538415586ebaacaedebc1e5899b0 ]
> 
> Parameter fragments and fragment_size are type of u32. U32_MAX is
> the correct check.

Why is this in stable? I doubt raising limit from 2GB to 4GB can be
called bugfix... kmalloc() will have problems allocating huge ammount
of memory, anyway.

Best regards,

							Pavel

> +++ b/sound/core/compress_offload.c
> @@ -529,7 +529,7 @@ static int snd_compress_check_input(struct snd_compr_params *params)
>  {
>  	/* first let's check the buffer parameter's */
>  	if (params->buffer.fragment_size == 0 ||
> -	    params->buffer.fragments > INT_MAX / params->buffer.fragment_size ||
> +	    params->buffer.fragments > U32_MAX / params->buffer.fragment_size ||
>  	    params->buffer.fragments == 0)
>  		return -EINVAL;
>  

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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