linux-kernel - Re: [PATCH v3 3/9] misc: fastrpc: Fix memory corruption in DSP capabilities

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Date: Thu, 30 May 2024 14:00:25 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Ekansh Gupta <quic_ekangupt@...cinc.com>
Cc: srinivas.kandagatla@...aro.org, linux-arm-msm@...r.kernel.org, 
	gregkh@...uxfoundation.org, quic_bkumar@...cinc.com, linux-kernel@...r.kernel.org, 
	quic_chennak@...cinc.com, stable <stable@...nel.org>
Subject: Re: [PATCH v3 3/9] misc: fastrpc: Fix memory corruption in DSP
 capabilities

On Thu, May 30, 2024 at 03:50:21PM +0530, Ekansh Gupta wrote:
> DSP capabilities request is sending bad size to utilities skel
> call which is resulting in memory corruption. Pass proper size
> to avoid the corruption.
> 
> Fixes: 6c16fd8bdd40 ("misc: fastrpc: Add support to get DSP capabilities")
> Cc: stable <stable@...nel.org>
> Signed-off-by: Ekansh Gupta <quic_ekangupt@...cinc.com>

Should be squashed to the previous commit.

> ---
>  drivers/misc/fastrpc.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
> index 61389795f498..3e1ab58038ed 100644
> --- a/drivers/misc/fastrpc.c
> +++ b/drivers/misc/fastrpc.c
> @@ -1695,6 +1695,7 @@ static int fastrpc_get_info_from_dsp(struct fastrpc_user *fl, uint32_t *dsp_attr
>  
>  	/* Capability filled in userspace */
>  	dsp_attr_buf[0] = 0;
> +	dsp_attr_buf_len -= 1;
>  
>  	args[0].ptr = (u64)(uintptr_t)&dsp_attr_buf_len;
>  	args[0].length = sizeof(dsp_attr_buf_len);
> -- 
> 2.43.0
> 

-- 
With best wishes
Dmitry