linux-kernel - Re: [PATCH] mtd: rawnand: meson: Fix a potential double free issue

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Message-Id: <20220609124418.209251-1-miquel.raynal@bootlin.com>
Date:   Thu,  9 Jun 2022 14:44:18 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Liang Yang <liang.yang@...ogic.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        Yixun Lan <yixun.lan@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org
Subject: Re: [PATCH] mtd: rawnand: meson: Fix a potential double free issue

On Fri, 2022-05-20 at 16:41:40 UTC, Christophe JAILLET wrote:
> When meson_nfc_nand_chip_cleanup() is called, it will call:
> 	meson_nfc_free_buffer(&meson_chip->nand);
> 	nand_cleanup(&meson_chip->nand);
> 
> nand_cleanup() in turn will call nand_detach() which calls the
> .detach_chip() which is here meson_nand_detach_chip().
> 
> meson_nand_detach_chip() already calls meson_nfc_free_buffer(), so we
> could double free some memory.
> 
> Fix it by removing the unneeded explicit call to meson_nfc_free_buffer().
> 
> Fixes: 8fae856c5350 ("mtd: rawnand: meson: add support for Amlogic NAND flash controller")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> Acked-by: Liang Yang <liang.yang@...ogic.com>

Applied to https://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git nand/next, thanks.

Miquel