linux-kernel - Re: KASAN: use-after-free Read in nl8NUM_dump_wpan

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Date:   Tue, 08 Oct 2019 18:24:00 -0700
From:   syzbot <syzbot+495688b736534bb6c6ad@...kaller.appspotmail.com>
To:     alex.aring@...il.com, davem@...emloft.net, jiri@...lanox.com,
        linux-kernel@...r.kernel.org, linux-wpan@...r.kernel.org,
        netdev@...r.kernel.org, stefan@...enfreihafen.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in nl8NUM_dump_wpan_phy

syzbot has bisected this bug to:

commit 75cdbdd089003cd53560ff87b690ae911fa7df8e
Author: Jiri Pirko <jiri@...lanox.com>
Date:   Sat Oct 5 18:04:37 2019 +0000

     net: ieee802154: have genetlink code to parse the attrs during dumpit

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=14620210e00000
start commit:   056ddc38 Merge branch 'stmmac-next'
git tree:       net-next
final crash:    https://syzkaller.appspot.com/x/report.txt?x=16620210e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12620210e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d9be300620399522
dashboard link: https://syzkaller.appspot.com/bug?extid=495688b736534bb6c6ad
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10e256c3600000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=175ecdfb600000

Reported-by: syzbot+495688b736534bb6c6ad@...kaller.appspotmail.com
Fixes: 75cdbdd08900 ("net: ieee802154: have genetlink code to parse the  
attrs during dumpit")

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