linux-kernel - Re: WARNING in binder_transaction_buffer

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Message-ID: <000000000000ecb92805ac33a761@google.com>
Date:   Thu, 06 Aug 2020 04:19:04 -0700
From:   syzbot <syzbot+e113a0b970b7b3f394ba@...kaller.appspotmail.com>
To:     arve@...roid.com, christian@...uner.io, devel@...verdev.osuosl.org,
        gregkh@...uxfoundation.org, jannh@...gle.com,
        joel@...lfernandes.org, linux-kernel@...r.kernel.org,
        maco@...roid.com, syzkaller-bugs@...glegroups.com,
        tkjos@...roid.com, tkjos@...gle.com
Subject: Re: WARNING in binder_transaction_buffer_release (2)

syzbot suspects this issue was fixed by commit:

commit 4b836a1426cb0f1ef2a6e211d7e553221594f8fc
Author: Jann Horn <jannh@...gle.com>
Date:   Mon Jul 27 12:04:24 2020 +0000

    binder: Prevent context manager from incrementing ref 0

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10c84dec900000
start commit:   9cb1fd0e Linux 5.7-rc7
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=cca7550d53ffa599
dashboard link: https://syzkaller.appspot.com/bug?extid=e113a0b970b7b3f394ba
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1230353c100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17fd535e100000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: binder: Prevent context manager from incrementing ref 0

For information about bisection process see: https://goo.gl/tpsmEJ#bisection