linux-kernel - Re: [PATCH 01/18] lib/stackdepot: fix setting next_slab_inited in init_stack

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Message-ID: <CAG_fn=U_WraAkVi9sdTNuk9sjQ8gEHWafsjcYEMYq2G8KX4HTg@mail.gmail.com>
Date:   Tue, 31 Jan 2023 10:07:58 +0100
From:   Alexander Potapenko <glider@...gle.com>
To:     andrey.konovalov@...ux.dev
Cc:     Marco Elver <elver@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
        Evgenii Stepanov <eugenis@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH 01/18] lib/stackdepot: fix setting next_slab_inited in init_stack_slab

On Mon, Jan 30, 2023 at 9:49 PM <andrey.konovalov@...ux.dev> wrote:
>
> From: Andrey Konovalov <andreyknvl@...gle.com>
>
> In commit 305e519ce48e ("lib/stackdepot.c: fix global out-of-bounds in
> stack_slabs"), init_stack_slab was changed to only use preallocated
> memory for the next slab if the slab number limit is not reached.
> However, setting next_slab_inited was not moved together with updating
> stack_slabs.
>
> Set next_slab_inited only if the preallocated memory was used for the
> next slab.
>
> Fixes: 305e519ce48e ("lib/stackdepot.c: fix global out-of-bounds in stack_slabs")
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
Reviewed-by: Alexander Potapenko <glider@...gle.com>