linux-kernel - Re: [Linux-kernel-mentees] [PATCH] idr: remove WARN_ON

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Message-ID: <20200915051331.GA7980@Thinkpad>
Date:   Tue, 15 Sep 2020 10:43:31 +0530
From:   Anmol Karn <anmol.karan123@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzbot+f7204dcf3df4bb4ce42c@...kaller.appspotmail.com,
        Eric Dumazet <eric.dumazet@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        netdev <netdev@...r.kernel.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Necip Fazil Yildiran <necip@...gle.com>
Subject: Re: [Linux-kernel-mentees] [PATCH] idr: remove WARN_ON_ONCE() when
 trying to check id

On Mon, Sep 14, 2020 at 08:26:55PM +0100, Matthew Wilcox wrote:
> On Tue, Sep 15, 2020 at 12:17:55AM +0530, Anmol Karn wrote:
> > On Mon, Sep 14, 2020 at 12:08:03PM +0100, Matthew Wilcox wrote:
> > > On Mon, Sep 14, 2020 at 12:47:24PM +0530, Anmol Karn wrote:
> > > > idr_get_next() gives WARN_ON_ONCE() when it gets (id > INT_MAX) true
> > > > and this happens when syzbot does fuzzing, and that warning is
> > > > expected, but WARN_ON_ONCE() is not required here and, cecking
> > > > the condition and returning NULL value would be suffice.
> > > > 
> > > > Reference: commit b9959c7a347 ("filldir[64]: remove WARN_ON_ONCE() for bad directory entries")
> > > > Reported-and-tested-by: syzbot+f7204dcf3df4bb4ce42c@...kaller.appspotmail.com
> > > > Link: https://syzkaller.appspot.com/bug?extid=f7204dcf3df4bb4ce42c 
> > > > Signed-off-by: Anmol Karn <anmol.karan123@...il.com>
> > > 
> > > https://lore.kernel.org/netdev/20200605120037.17427-1-willy@infradead.org/
> > 
> > Hello sir,
> > 
> > I have looked into the patch, and it seems the problem is fixed to the root cause
> > in this patch, but not yet merged due to some backport issues, so, please ignore 
> > this patch(sent by me), and please let me know if i can contribute to fixing this 
> > bug's root cause.
> 
> The root cause is that the network maintainers believe I have a far
> greater interest in the qrtr code than I actually do, and the maintainer
> of the qrtr code is not doing anything.

Hello sir,

I hope the patch will get merged soon.

also, i have tried a patch for this bug

Link: https://syzkaller.appspot.com/bug?extid=3b14b2ed9b3d06dcaa07

can you please guide me little how should i proceede with it, and 
also syzbot tested it.  


Thanks,
Anmol