linux-kernel - Re: [PATCH] staging: vme_user: Validate geoid used for VME window address

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Date: Fri, 21 Jun 2024 13:10:22 +0200
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Aleksandr Mishin <amishin@...rgos.ru>
Cc: Martyn Welch <martyn.welch@...anuc.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Soumya Negi <soumya.negi97@...il.com>,
	Michael Straube <straube.linux@...il.com>,
	linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
	lvc-project@...uxtesting.org
Subject: Re: [PATCH] staging: vme_user: Validate geoid used for VME window
 address

On Fri, Jun 21, 2024 at 01:42:46PM +0300, Aleksandr Mishin wrote:
> In tsi148_crcsr_init() value of vme_base used as 3rd parameter in
> tsi148_master_set() call is calculated as 'vstat * 0x80000'. vstat value
> can be set from module parameter "geoid" which can be any. In this case
> the value of an arithmetic expression 'vstat * 0x80000' is a subject to
> overflow because its operands are not cast to a larger data type before
> performing arithmetic.
> 
> Add geoid validation to prevent overflow.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: d22b8ed9a3b0 ("Staging: vme: add Tundra TSI148 VME-PCI Bridge driver")
> Signed-off-by: Aleksandr Mishin <amishin@...rgos.ru>
> ---
>  drivers/staging/vme_user/vme_tsi148.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/vme_user/vme_tsi148.c b/drivers/staging/vme_user/vme_tsi148.c
> index 2ec9c2904404..b601d2b20bed 100644
> --- a/drivers/staging/vme_user/vme_tsi148.c
> +++ b/drivers/staging/vme_user/vme_tsi148.c
> @@ -2119,7 +2119,7 @@ static int tsi148_slot_get(struct vme_bridge *tsi148_bridge)
>  		slot = ioread32be(bridge->base + TSI148_LCSR_VSTAT);
>  		slot = slot & TSI148_LCSR_VSTAT_GA_M;
>  	} else {
> -		slot = geoid;
> +		slot = geoid & TSI148_LCSR_VSTAT_GA_M;

geoid is a module parameter.  It would be better to add some validation
to the probe() function instead of working around invalid values here.

regards,
dan carpenter