Hello, syzbot found the following issue on:
HEAD commit: 9791581c Merge tag 'for-5.11-rc4-tag' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11970b20d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=39701af622f054a9 dashboard link: https://syzkaller.appspot.com/bug?extid=70ba6cae2f44c82dcb76 compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+70ba6cae2f44c82dc...@syzkaller.appspotmail.com UBSAN: array-index-out-of-bounds in drivers/net/hamradio/6pack.c:845:16 index 400 is out of range for type 'unsigned char [400]' CPU: 0 PID: 24 Comm: kworker/u4:1 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:356 decode_data.part.0+0x2c8/0x2e0 drivers/net/hamradio/6pack.c:845 decode_data drivers/net/hamradio/6pack.c:965 [inline] sixpack_decode drivers/net/hamradio/6pack.c:968 [inline] sixpack_receive_buf drivers/net/hamradio/6pack.c:458 [inline] sixpack_receive_buf+0xd8c/0x1320 drivers/net/hamradio/6pack.c:435 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:465 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x20d/0x380 drivers/tty/tty_buffer.c:533 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 ================================================================================ Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 24 Comm: kworker/u4:1 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_unbound flush_to_ldisc Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 panic+0x306/0x73d kernel/panic.c:231 ubsan_epilogue+0x54/0x5a lib/ubsan.c:162 __ubsan_handle_out_of_bounds.cold+0x62/0x6c lib/ubsan.c:356 decode_data.part.0+0x2c8/0x2e0 drivers/net/hamradio/6pack.c:845 decode_data drivers/net/hamradio/6pack.c:965 [inline] sixpack_decode drivers/net/hamradio/6pack.c:968 [inline] sixpack_receive_buf drivers/net/hamradio/6pack.c:458 [inline] sixpack_receive_buf+0xd8c/0x1320 drivers/net/hamradio/6pack.c:435 tty_ldisc_receive_buf+0x14a/0x190 drivers/tty/tty_buffer.c:465 tty_port_default_receive_buf+0x6e/0xa0 drivers/tty/tty_port.c:38 receive_buf drivers/tty/tty_buffer.c:481 [inline] flush_to_ldisc+0x20d/0x380 drivers/tty/tty_buffer.c:533 process_one_work+0x98d/0x15f0 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Kernel Offset: disabled Rebooting in 86400 seconds.. --- 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 syzkal...@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
