netdev - Re: [syzbot] memory leak in smc

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Date:   Thu, 31 Mar 2022 14:42:15 +0800
From:   Tony Lu <tonylu@...ux.alibaba.com>
To:     syzbot <syzbot+6e29a053eb165bd50de5@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, kgraul@...ux.ibm.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        netdev@...r.kernel.org, pabeni@...hat.com,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in smc_create (2)

On Mon, Mar 28, 2022 at 01:59:26PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    ed4643521e6a Merge tag 'arm-dt-5.18' of git://git.kernel.o..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=14d17b99700000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8414405fa34d7154
> dashboard link: https://syzkaller.appspot.com/bug?extid=6e29a053eb165bd50de5
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16431151700000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15f44cdb700000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+6e29a053eb165bd50de5@...kaller.appspotmail.com
 
__smc_release() does not handle it properly when it falls back and
sk_state is SMC_CLOSED but not calls sock_put(). This makes sk leaks.

I will fix it soon.

Tony Lu