Hello, syzbot found the following issue on: HEAD commit: 8f4dd16603ce Merge branch 'akpm' (patches from Andrew) git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=110ecc12f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=d21a72f6016e37e8 dashboard link: https://syzkaller.appspot.com/bug?extid=f4751c2cc423e56e9e79 compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 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+f4751c2cc423e56e9e79@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: global-out-of-bounds in get_unaligned_be64 include/asm-generic/unaligned.h:67 [inline] BUG: KASAN: global-out-of-bounds in ieee802154_be64_to_le64 include/net/mac802154.h:367 [inline] BUG: KASAN: global-out-of-bounds in mac802154_header_create+0x4f6/0x530 net/mac802154/iface.c:455 Read of size 8 at addr ffffffff8a597460 by task dhcpcd/3342 CPU: 3 PID: 3342 Comm: dhcpcd Not tainted 5.18.0-rc4-syzkaller-00064-g8f4dd16603ce #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0xf/0x467 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 get_unaligned_be64 include/asm-generic/unaligned.h:67 [inline] ieee802154_be64_to_le64 include/net/mac802154.h:367 [inline] mac802154_header_create+0x4f6/0x530 net/mac802154/iface.c:455 dev_hard_header include/linux/netdevice.h:2983 [inline] vlan_dev_hard_header+0x13d/0x510 net/8021q/vlan_dev.c:82 dev_hard_header include/linux/netdevice.h:2983 [inline] lapbeth_data_transmit+0x29f/0x350 drivers/net/wan/lapbether.c:257 lapb_data_transmit+0x8f/0xc0 net/lapb/lapb_iface.c:447 lapb_transmit_buffer+0x183/0x390 net/lapb/lapb_out.c:149 lapb_send_control+0x1c7/0x370 net/lapb/lapb_subr.c:251 lapb_establish_data_link+0xe7/0x110 net/lapb/lapb_out.c:163 lapb_device_event+0x395/0x560 net/lapb/lapb_iface.c:512 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1938 call_netdevice_notifiers_extack net/core/dev.c:1976 [inline] call_netdevice_notifiers net/core/dev.c:1990 [inline] __dev_notify_flags+0x110/0x2b0 net/core/dev.c:8471 dev_change_flags+0x112/0x170 net/core/dev.c:8509 devinet_ioctl+0x15d1/0x1ca0 net/ipv4/devinet.c:1148 inet_ioctl+0x1e6/0x320 net/ipv4/af_inet.c:969 sock_do_ioctl+0xcc/0x230 net/socket.c:1122 sock_ioctl+0x2f1/0x640 net/socket.c:1239 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+0x44/0xae RIP: 0033:0x7f934e09d0e7 Code: 3c 1c e8 1c ff ff ff 85 c0 79 87 49 c7 c4 ff ff ff ff 5b 5d 4c 89 e0 41 5c c3 66 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 61 9d 0c 00 f7 d8 64 89 01 48 RSP: 002b:00007ffc98450468 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f934dfaf6c8 RCX: 00007f934e09d0e7 RDX: 00007ffc98460658 RSI: 0000000000008914 RDI: 0000000000000008 RBP: 00007ffc98470808 R08: 00007ffc98460618 R09: 00007ffc984605c8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc98460658 R14: 0000000000000028 R15: 0000000000008914 </TASK> The buggy address belongs to the variable: bcast_addr+0x0/0x14a0 Memory state around the buggy address: ffffffff8a597300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffffff8a597380: 00 00 00 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 f9 >ffffffff8a597400: 00 00 00 00 00 00 f9 f9 f9 f9 f9 f9 06 f9 f9 f9 ^ ffffffff8a597480: f9 f9 f9 f9 00 00 00 00 00 06 f9 f9 f9 f9 f9 f9 ffffffff8a597500: 03 f9 f9 f9 f9 f9 f9 f9 00 00 00 00 00 f9 f9 f9 ================================================================== --- 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@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
