linux-kernel - Re: [f2fs-dev] KMSAN: uninit-value in f2fs

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Message-ID: <20200925164538.GB3315208@gmail.com>
Date:   Fri, 25 Sep 2020 09:45:38 -0700
From:   Eric Biggers <ebiggers@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
Cc:     syzbot <syzbot+0eac6f0bbd558fd866d7@...kaller.appspotmail.com>,
        chao@...nel.org, glider@...gle.com, jaegeuk@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [f2fs-dev] KMSAN: uninit-value in f2fs_lookup

On Fri, Sep 25, 2020 at 09:38:19AM -0700, Eric Biggers wrote:
> On Fri, Sep 25, 2020 at 05:06:33PM +0800, Chao Yu wrote:
> > Hi,
> > 
> > I don't see any problem here, thanks for your report. :)
> > 
> > Thanks,
> 
> What about if max_depth == 0 in __f2fs_find_entry()?  Then __f2fs_find_entry()
> would return NULL without initializing *res_page.

... and I now see Dan Carpenter already pointed this out.  I was a bit late!

- Eric