linux-kernel - Re: [PATCH] f2fs: read page index before freeing

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Message-ID: <3ebe6814-586e-77e8-52fa-47fb61d760f5@huawei.com>
Date:   Mon, 26 Nov 2018 17:13:53 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Pan Bian <bianpan2016@....com>, Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] f2fs: read page index before freeing

Hi Pan,

On 2018/11/22 18:58, Pan Bian wrote:
> The function truncate_node frees the page with f2fs_put_page. However,
> the page index is read after that. So, the patch reads the index before
> freeing the page.

I notice that you found another use-after-free bug in ext4, out of
curiosity, I'd like to ask how do you find those bugs? by tool or code review?

Thanks,