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([2a0b:e7c0:0:107::70f]) by smtp.gmail.com with ESMTPSA id c41-20020a509fac000000b0043ba0cf5dbasm5482421edf.2.2022.08.29.01.40.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 29 Aug 2022 01:40:33 -0700 (PDT) Message-ID: Date: Mon, 29 Aug 2022 10:40:32 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.2.0 Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in tty_ldisc_receive_buf Content-Language: en-US To: syzbot , gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <000000000000e51e3e05e6ff44db@google.com> From: Jiri Slaby In-Reply-To: <000000000000e51e3e05e6ff44db@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org #syz dup: BUG: unable to handle kernel NULL pointer dereference in gsmld_receive_buf On 24. 08. 22, 18:35, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 1c23f9e627a7 Linux 6.0-rc2 > git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci > console output: https://syzkaller.appspot.com/x/log.txt?x=177ac367080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=3045c937aad027f7 > dashboard link: https://syzkaller.appspot.com/bug?extid=be4b95faeb7a9073bb88 > compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 > userspace arch: arm64 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1701758d080000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17473aad080000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+be4b95faeb7a9073bb88@syzkaller.appspotmail.com > > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 > Mem abort info: > ESR = 0x0000000086000006 > EC = 0x21: IABT (current EL), IL = 32 bits > SET = 0, FnV = 0 > EA = 0, S1PTW = 0 > FSC = 0x06: level 2 translation fault > user pgtable: 4k pages, 48-bit VAs, pgdp=000000010b44f000 > [0000000000000000] pgd=080000010b5f3003, p4d=080000010b5f3003, pud=080000010b1ce003, pmd=0000000000000000 > Internal error: Oops: 86000006 [#1] PREEMPT SMP > Modules linked in: > CPU: 1 PID: 28 Comm: kworker/u4:1 Not tainted 6.0.0-rc2-syzkaller-16440-g1c23f9e627a7 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/20/2022 > Workqueue: events_unbound flush_to_ldisc > pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : 0x0 > lr : gsmld_receive_buf+0x140/0x214 drivers/tty/n_gsm.c:2861 > sp : ffff80000f603c30 > x29: ffff80000f603c40 x28: 0000000000000000 x27: 00000000000003d9 > x26: 0000000000000000 x25: 0000000000000000 x24: ffff80000d937000 > x23: ffff80000d681e40 x22: ffff0000c929b800 x21: 0000000000000000 > x20: ffff80000c205988 x19: ffff0000c91cf446 x18: ffff80000d2dec40 > x17: 0000000000000008 x16: 0000000000000000 x15: 0000000000000000 > x14: 0000000000000000 x13: 0000000000000004 x12: ffff80000d681e78 > x11: ff808000098e7e04 x10: 0000000000000000 x9 : ffff8000098e7e04 > x8 : 0000000000000000 x7 : ffff8000098dac3c x6 : 0000000000000000 > x5 : 0000000000000000 x4 : 0000000000000001 x3 : 00000000000003da > x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff0000c929b800 > Call trace: > 0x0 > tty_ldisc_receive_buf+0xb8/0xcc drivers/tty/tty_buffer.c:461 > tty_port_default_receive_buf+0x54/0x8c drivers/tty/tty_port.c:39 > receive_buf drivers/tty/tty_buffer.c:511 [inline] > flush_to_ldisc+0x150/0x358 drivers/tty/tty_buffer.c:561 > process_one_work+0x2d8/0x504 kernel/workqueue.c:2289 > worker_thread+0x340/0x610 kernel/workqueue.c:2436 > kthread+0x12c/0x158 kernel/kthread.c:376 > ret_from_fork+0x10/0x20 > Code: bad PC value > ---[ end trace 0000000000000000 ]--- > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches -- js suse labs