linux-kernel - Re: [PATCH] mtd: nand: gpmi: Fix a double free in gpmi_nand

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Date:   Wed,  7 Apr 2021 11:06:33 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>, han.xu@....com,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        bbrezillon@...nel.org
Cc:     linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: nand: gpmi: Fix a double free in gpmi_nand_init

On Sat, 2021-04-03 at 06:09:05 UTC, Lv Yunlong wrote:
> If the callee gpmi_alloc_dma_buffer() failed to alloc memory for
> this->raw_buffer, gpmi_free_dma_buffer() will be called to free
> this->auxiliary_virt. But this->auxiliary_virt is still a non-NULL
> and valid ptr.
> 
> Then gpmi_alloc_dma_buffer() returns err and gpmi_free_dma_buffer()
> is called again to free this->auxiliary_virt in err_out. This causes
> a double free.
> 
> As gpmi_free_dma_buffer() has already called in gpmi_alloc_dma_buffer's
> error path, so it should return err directly instead of releasing the dma
> buffer again.
> 
> Fixes: 4d02423e9afe6 ("mtd: nand: gpmi: Fix gpmi_nand_init() error path")
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>

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

Miquel