linux-kernel - Re: general protection fault in devlink_get_from

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Message-ID: <20191007191102.GD2326@nanopsycho>
Date:   Mon, 7 Oct 2019 21:11:02 +0200
From:   Jiri Pirko <jiri@...nulli.us>
To:     syzbot <syzbot+896295c817162503d359@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, jiri@...lanox.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in devlink_get_from_attrs

Mon, Oct 07, 2019 at 08:59:11PM CEST, syzbot+896295c817162503d359@...kaller.appspotmail.com wrote:
>Hello,
>
>syzbot found the following crash on:
>
>HEAD commit:    056ddc38 Merge branch 'stmmac-next'
>git tree:       net-next
>console output: https://syzkaller.appspot.com/x/log.txt?x=1590218f600000
>kernel config:  https://syzkaller.appspot.com/x/.config?x=d9be300620399522
>dashboard link: https://syzkaller.appspot.com/bug?extid=896295c817162503d359
>compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10a6a6c3600000
>C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=15fd50dd600000
>
>IMPORTANT: if you fix the bug, please add the following tag to the commit:
>Reported-by: syzbot+896295c817162503d359@...kaller.appspotmail.com
>
>kasan: CONFIG_KASAN_INLINE enabled
>kasan: GPF could be caused by NULL-ptr deref or user memory access
>general protection fault: 0000 [#1] PREEMPT SMP KASAN
>CPU: 1 PID: 8790 Comm: syz-executor447 Not tainted 5.4.0-rc1+ #0
>Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
>Google 01/01/2011
>RIP: 0010:devlink_get_from_attrs+0x32/0x300 net/core/devlink.c:124

This is fixed already by:
5c23afb980b2 ("net: devlink: fix reporter dump dumpit")