linux-kernel - Re: [PATCH] mm/vmscan: Initialize dirty to prevent uninitialized use

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Message-ID: <CAOUHufaFz=G+0o5c+u9YY-4n1KExS6_tOFATY1TMyWWcrAQ8Ng@mail.gmail.com>
Date: Tue, 25 Mar 2025 14:35:53 -0600
From: Yu Zhao <yuzhao@...gle.com>
To: Purva Yeshi <purvayeshi550@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/vmscan: Initialize dirty to prevent uninitialized use

On Tue, Mar 25, 2025 at 1:49 PM Purva Yeshi <purvayeshi550@...il.com> wrote:
>
> Fix Smatch-detected error:
> mm/vmscan.c:3509 walk_pte_range() error: uninitialized symbol 'dirty'.
> mm/vmscan.c:3522 walk_pte_range() error: uninitialized symbol 'dirty'.
> mm/vmscan.c:3600 walk_pmd_range_locked() error: uninitialized symbol 'dirty'.
> mm/vmscan.c:3614 walk_pmd_range_locked() error: uninitialized symbol 'dirty'.
> mm/vmscan.c:4220 lru_gen_look_around() error: uninitialized symbol 'dirty'.
> mm/vmscan.c:4232 lru_gen_look_around() error: uninitialized symbol 'dirty'.
>
> Smatch reports 'dirty' as uninitialized, leading to potential
> undefined behavior.

Thanks -- this seems like false positives from Smatch, where the
problem should be fixed.

> Explicitly initialize dirty to 0 in walk_pte_range(),
> walk_pmd_range_locked(), and lru_gen_look_around() in mm/vmscan.c
> to fix Smatch error.
>
> Signed-off-by: Purva Yeshi <purvayeshi550@...il.com>