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

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Date:   Thu, 26 May 2022 13:34:45 +0800
From:   Liang Yang <liang.yang@...ogic.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        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

Hi Christophe,

On 2022/5/21 0:41, Christophe JAILLET wrote:
> [ EXTERNAL EMAIL ]
> 
> 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>
> ---
> This patch is speculative, so review with care.
> ---
>   drivers/mtd/nand/raw/meson_nand.c | 1 -
>   1 file changed, 1 deletion(-)
> 
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index ac3be92872d0..032180183339 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -1307,7 +1307,6 @@ static int meson_nfc_nand_chip_cleanup(struct meson_nfc *nfc)
>   		if (ret)
>   			return ret;
>   
> -		meson_nfc_free_buffer(&meson_chip->nand);
>   		nand_cleanup(&meson_chip->nand);
>   		list_del(&meson_chip->node);
>   	}

Acked-by: Liang Yang <liang.yang@...ogic.com>

Thanks,
Liang