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Date: Tue, 9 Aug 2022 14:47:35 +0200 From: Jiri Slaby <jirislaby@...nel.org> To: syzbot <syzbot+e3563f0c94e188366dbb@...kaller.appspotmail.com>, gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Cc: "D. Starke" <daniel.starke@...mens.com> Subject: Re: [syzbot] BUG: unable to handle kernel NULL pointer dereference in gsmld_receive_buf CC Daniel again. On 08. 08. 22, 15:05, syzbot wrote: > syzbot has found a reproducer for the following issue on: > > HEAD commit: ca688bff68bc Add linux-next specific files for 20220808 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=14a27066080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=4c20e006003cdecb > dashboard link: https://syzkaller.appspot.com/bug?extid=e3563f0c94e188366dbb > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=164eb3ca080000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17327ce1080000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e3563f0c94e188366dbb@...kaller.appspotmail.com > > BUG: kernel NULL pointer dereference, address: 0000000000000000 > #PF: supervisor instruction fetch in kernel mode > #PF: error_code(0x0010) - not-present page > PGD 74c90067 P4D 74c90067 PUD 74c53067 PMD 0 > Oops: 0010 [#1] PREEMPT SMP KASAN > CPU: 1 PID: 3606 Comm: syz-executor237 Not tainted 5.19.0-next-20220808-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 > RIP: 0010:0x0 > Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. > RSP: 0018:ffffc9000387fcf0 EFLAGS: 00010202 > RAX: 0000000000000001 RBX: ffff88801bbdf000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801bbdf000 > RBP: ffffc9000387fda1 R08: 0000000000000001 R09: 0000000000000004 > R10: 0000000000000000 R11: 1ffffffff1ffa9ce R12: 0000000000000001 > R13: 0000000000000000 R14: ffffc9000387fd90 R15: dffffc0000000000 > FS: 0000555556e8d300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffffffffd6 CR3: 000000001c7e0000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861 > tiocsti drivers/tty/tty_io.c:2293 [inline] > tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692 > vfs_ioctl fs/ioctl.c:51 [inline] > __do_sys_ioctl fs/ioctl.c:870 [inline] > __se_sys_ioctl fs/ioctl.c:856 [inline] > __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7f76c0e5eb59 > Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffe9a4f7c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f76c0e5eb59 > RDX: 0000000020000040 RSI: 0000000000005412 RDI: 0000000000000004 > RBP: 00007f76c0e22d00 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f76c0e22d90 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK> > Modules linked in: > CR2: 0000000000000000 > ---[ end trace 0000000000000000 ]--- > RIP: 0010:0x0 > Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6. > RSP: 0018:ffffc9000387fcf0 EFLAGS: 00010202 > RAX: 0000000000000001 RBX: ffff88801bbdf000 RCX: 0000000000000000 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88801bbdf000 > RBP: ffffc9000387fda1 R08: 0000000000000001 R09: 0000000000000004 > R10: 0000000000000000 R11: 1ffffffff1ffa9ce R12: 0000000000000001 > R13: 0000000000000000 R14: ffffc9000387fd90 R15: dffffc0000000000 > FS: 0000555556e8d300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: ffffffffffffffd6 CR3: 000000001c7e0000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > -- js suse labs
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