linux-kernel - Re: [PATCH v4] mtd: rawnand: atmel: fix refcount issue in atmel_nand_controller

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Message-Id: <20220314160000.77465-1-miquel.raynal@bootlin.com>
Date:   Mon, 14 Mar 2022 17:00:00 +0100
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Xin Xiong <xiongx18@...an.edu.cn>,
        Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Claudiu Beznea <claudiu.beznea@...rochip.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     yuanxzhang@...an.edu.cn, Xiyu Yang <xiyuyang19@...an.edu.cn>,
        Xin Tan <tanxin.ctf@...il.com>
Subject: Re: [PATCH v4] mtd: rawnand: atmel: fix refcount issue in atmel_nand_controller_init

On Fri, 2022-03-04 at 08:53:32 UTC, Xin Xiong wrote:
> The reference counting issue happens in several error handling paths
> on a refcounted object "nc->dmac". In these paths, the function simply
> returns the error code, forgetting to balance the reference count of
> "nc->dmac", increased earlier by dma_request_channel(), which may
> cause refcount leaks.
> 
> Fix it by decrementing the refcount of specific object in those error
> paths.
> 
> Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
> Co-developed-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Signed-off-by: Xiyu Yang <xiyuyang19@...an.edu.cn>
> Co-developed-by: Xin Tan <tanxin.ctf@...il.com>
> Signed-off-by: Xin Tan <tanxin.ctf@...il.com>
> Signed-off-by: Xin Xiong <xiongx18@...an.edu.cn>
> Reviewed-by: Claudiu Beznea <claudiu.beznea@...rochip.com>

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

Miquel