linux-kernel - Re: [PATCH] tools/power/x86/intel-speed-select: Fix off by one check

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Date:   Mon, 18 Jul 2022 08:29:13 -0700
From:   srinivas pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] tools/power/x86/intel-speed-select: Fix off by one check

On Mon, 2022-07-18 at 16:17 +0300, Dan Carpenter wrote:
> Change > MAX_DIE_PER_PACKAGE to >= MAX_DIE_PER_PACKAGE to prevent
> accessing one element beyond the end of the array.
> 
> Fixes: 7fd786dfbd2c ("tools/power/x86/intel-speed-select: OOB daemon
> mode")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Thanks. I will add to PULL request.


> ---
>  tools/power/x86/intel-speed-select/isst-daemon.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/power/x86/intel-speed-select/isst-daemon.c
> b/tools/power/x86/intel-speed-select/isst-daemon.c
> index dd372924bc82..d0400c6684ba 100644
> --- a/tools/power/x86/intel-speed-select/isst-daemon.c
> +++ b/tools/power/x86/intel-speed-select/isst-daemon.c
> @@ -41,7 +41,7 @@ void process_level_change(int cpu)
>         time_t tm;
>         int ret;
>  
> -       if (pkg_id >= MAX_PACKAGE_COUNT || die_id >
> MAX_DIE_PER_PACKAGE) {
> +       if (pkg_id >= MAX_PACKAGE_COUNT || die_id >=
> MAX_DIE_PER_PACKAGE) {
>                 debug_printf("Invalid package/die info for cpu:%d\n",
> cpu);
>                 return;
>         }