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

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Message-ID: <87pnn3v0m3.fsf@ashishki-desk.ger.corp.intel.com>
Date:   Mon, 24 Jun 2019 11:39:00 +0300
From:   Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:     syzbot <syzbot+37100ea87beb0cac28f4@...kaller.appspotmail.com>,
        acme@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, jolsa@...hat.com, kafai@...com,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        namhyung@...nel.org, netdev@...r.kernel.org, peterz@...radead.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com
Subject: Re: KASAN: use-after-free Read in _free_event

syzbot <syzbot+37100ea87beb0cac28f4@...kaller.appspotmail.com> writes:

> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+37100ea87beb0cac28f4@...kaller.appspotmail.com
>
> ==================================================================
> BUG: KASAN: use-after-free in atomic_read  
> include/asm-generic/atomic-instrumented.h:26 [inline]
> BUG: KASAN: use-after-free in refcount_sub_and_test_checked+0x87/0x200  
> lib/refcount.c:182
> Read of size 4 at addr ffff88804e9f06e0 by task syz-executor.5/13046

Looks exactly like [1]. There's a proposed fix there, too.

[1] https://marc.info/?l=linux-kernel&m=153111554522295

Regards,
--
Alex