Date:   Fri, 17 Feb 2023 13:11:46 +0200
From:   Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To:     Yury Norov <yury.norov@gmail.com>
Cc:     linux-kernel@vger.kernel.org,
        "David S. Miller" <davem@davemloft.net>,
        Barry Song <baohua@kernel.org>,
        Ben Segall <bsegall@google.com>,
        Bruno Goncalves <bgoncalv@redhat.com>,
        Dietmar Eggemann <dietmar.eggemann@arm.com>,
        Gal Pressman <gal@nvidia.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Haniel Bristot de Oliveira <bristot@redhat.com>,
        Heiko Carstens <hca@linux.ibm.com>,
        Ingo Molnar <mingo@redhat.com>,
        Jacob Keller <jacob.e.keller@intel.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Jason Gunthorpe <jgg@nvidia.com>,
        Jesse Brandeburg <jesse.brandeburg@intel.com>,
        Jonathan Cameron <Jonathan.Cameron@huawei.com>,
        Juri Lelli <juri.lelli@redhat.com>,
        Kees Cook <kees@kernel.org>,
        Leon Romanovsky <leonro@nvidia.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Mel Gorman <mgorman@suse.de>,
        Peter Lafreniere <peter@n8pjl.ca>,
        Peter Zijlstra <peterz@infradead.org>,
        Rasmus Villemoes <linux@rasmusvillemoes.dk>,
        Saeed Mahameed <saeedm@nvidia.com>,
        Steven Rostedt <rostedt@goodmis.org>,
        Tariq Toukan <tariqt@nvidia.com>,
        Tariq Toukan <ttoukan.linux@gmail.com>,
        Tony Luck <tony.luck@intel.com>,
        Valentin Schneider <vschneid@redhat.com>,
        Vincent Guittot <vincent.guittot@linaro.org>,
        linux-crypto@vger.kernel.org, netdev@vger.kernel.org,
        linux-rdma@vger.kernel.org
Subject: Re: [PATCH 3/9] sched: add sched_numa_find_nth_cpu()
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References: <20230121042436.2661843-1-yury.norov@gmail.com>
 <20230121042436.2661843-4-yury.norov@gmail.com>
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On Thu, Feb 16, 2023 at 05:39:08PM -0800, Yury Norov wrote:

> From: Yury Norov <yury.norov@gmail.com>
> Date: Thu, 16 Feb 2023 17:03:30 -0800
> Subject: [PATCH] sched/topology: fix KASAN warning in hop_cmp()
> 
> Despite that prev_hop is used conditionally on curr_hop is not the

curr --> cur

> first hop, it's initialized unconditionally.
> 
> Because initialization implies dereferencing, it might happen that
> the code dereferences uninitialized memory, which has been spotted by
> KASAN. Fix it by reorganizing hop_cmp() logic.

Nice catch! I guess it deserves for a comment inside the code
(IIRC I was puzzled of the logic behind and it was changed due
 to lack of this knowledge.)


-- 
With Best Regards,
Andy Shevchenko