linux-kernel - Re: [PATCH v9 1/7] lib/stackdepot: Fix first entry having a 0-handle

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Message-ID: <d1589640-fd03-447c-9d8a-9f53c844e262@suse.cz>
Date: Thu, 15 Feb 2024 11:46:31 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Oscar Salvador <osalvador@...e.de>,
 Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org,
 Michal Hocko <mhocko@...e.com>, Marco Elver <elver@...gle.com>,
 Andrey Konovalov <andreyknvl@...il.com>,
 Alexander Potapenko <glider@...gle.com>
Subject: Re: [PATCH v9 1/7] lib/stackdepot: Fix first entry having a 0-handle

On 2/14/24 18:01, Oscar Salvador wrote:
> The very first entry of stack_record gets a handle of 0, but this is wrong
> because stackdepot treats a 0-handle as a non-valid one.
> E.g: See the check in stack_depot_fetch()
> 
> Fix this by adding and offset of 1.
> 
> This bug has been lurking since the very beginning of stackdepot,
> but no one really cared as it seems.
> Because of that I am not adding a Fixes tag.
> 
> Co-developed-by: Marco Elver <elver@...gle.com>
> Signed-off-by: Marco Elver <elver@...gle.com>
> Signed-off-by: Oscar Salvador <osalvador@...e.de>

Acked-by: Vlastimil Babka <vbabka@...e.cz>