linux-kernel - Re: WARNING: refcount bug in sctp_transport

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Message-ID: <20180814012419.GB26909@localhost.localdomain>
Date:   Mon, 13 Aug 2018 22:24:21 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     syzbot <syzbot+6a15c8ad0f0632ccd7f3@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, linux-kernel@...r.kernel.org,
        linux-sctp@...r.kernel.org, netdev@...r.kernel.org,
        nhorman@...driver.com, syzkaller-bugs@...glegroups.com,
        vyasevich@...il.com
Subject: Re: WARNING: refcount bug in sctp_transport_put

On Mon, Aug 13, 2018 at 05:55:02PM -0700, syzbot wrote:
> ------------[ cut here ]------------
> refcount_t: underflow; use-after-free.
> WARNING: CPU: 1 PID: 7203 at lib/refcount.c:187
> refcount_sub_and_test+0x2e7/0x350 lib/refcount.c:187
> Kernel panic - not syncing: panic_on_warn set ...
> 
...
>  refcount_dec_and_test+0x1a/0x20 lib/refcount.c:212
>  sctp_transport_put+0x76/0x200 net/sctp/transport.c:331
>  sctp_generate_heartbeat_event+0x2d7/0x450 net/sctp/sm_sideeffect.c:416
>  call_timer_fn+0x242/0x970 kernel/time/timer.c:1326
>  expire_timers kernel/time/timer.c:1363 [inline]
>  __run_timers+0x7a6/0xc70 kernel/time/timer.c:1666
>  run_timer_softirq+0x4c/0x70 kernel/time/timer.c:1692
>  __do_softirq+0x2e8/0xb17 kernel/softirq.c:292
>  invoke_softirq kernel/softirq.c:372 [inline]
>  irq_exit+0x1d4/0x210 kernel/softirq.c:412
>  exiting_irq arch/x86/include/asm/apic.h:527 [inline]
>  smp_apic_timer_interrupt+0x186/0x730 arch/x86/kernel/apic/apic.c:1055
>  apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:863
>  </IRQ>

Interesting, again on heartbeat timer handler.

  Marcelo