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Message-ID: <ff3f7c023d73c2c8216cff2910e4965a026cdd98.camel@linux.intel.com>
Date: Thu, 05 Oct 2023 08:09:34 -0700
From: srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To: David Arcari <darcari@...hat.com>, linux-pm@...r.kernel.org
Cc: "Rafael J. Wysocki" <rafael@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Amit Kucheria <amitk@...nel.org>,
Zhang Rui <rui.zhang@...el.com>, Chen Yu <yu.c.chen@...el.com>,
linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] thermal: intel: powerclamp: fix mismatch in get
function for max_idle
On Thu, 2023-10-05 at 07:17 -0400, David Arcari wrote:
> KASAN reported this
>
> [ 444.853098] BUG: KASAN: global-out-of-bounds in
> param_get_int+0x77/0x90
> [ 444.853111] Read of size 4 at addr ffffffffc16c9220 by task
> cat/2105
> ...
> [ 444.853442] The buggy address belongs to the variable:
> [ 444.853443] max_idle+0x0/0xffffffffffffcde0
> [intel_powerclamp]
>
> There is a mismatch between the param_get_int and the definition of
> max_idle. Replacing param_get_int with param_get_byte resolves this
> issue.
>
> Fixes: ebf519710218 ("thermal: intel: powerclamp: Add two module
> parameters")
>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Cc: Daniel Lezcano <daniel.lezcano@...aro.org>
> Cc: Amit Kucheria <amitk@...nel.org>
> Cc: Zhang Rui <rui.zhang@...el.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> Cc: David Arcari <darcari@...hat.com>
> Cc: Chen Yu <yu.c.chen@...el.com>
> Cc: linux-kernel@...r.kernel.org
> Cc: stable@...r.kernel.org
> Signed-off-by: David Arcari <darcari@...hat.com>
Reviewed-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
> ---
> drivers/thermal/intel/intel_powerclamp.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/thermal/intel/intel_powerclamp.c
> b/drivers/thermal/intel/intel_powerclamp.c
> index 36243a3972fd..5ac5cb60bae6 100644
> --- a/drivers/thermal/intel/intel_powerclamp.c
> +++ b/drivers/thermal/intel/intel_powerclamp.c
> @@ -256,7 +256,7 @@ static int max_idle_set(const char *arg, const
> struct kernel_param *kp)
>
> static const struct kernel_param_ops max_idle_ops = {
> .set = max_idle_set,
> - .get = param_get_int,
> + .get = param_get_byte,
> };
>
> module_param_cb(max_idle, &max_idle_ops, &max_idle, 0644);
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