IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: slab-out-of-bounds in batadv_interface_tx+0x160a/0x18b0 net/batman-adv/soft-interface.c:226 Read of size 2 at addr ffff88808d5b00cb by task syz-executor096/8411 CPU: 1 PID: 8411 Comm: syz-executor096 Not tainted 4.20.0-rc7+ #361 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c6 lib/dump_stack.c:113 print_address_description.cold.8+0x9/0x1ff mm/kasan/report.c:256 kasan_report_error mm/kasan/report.c:354 [inline] kasan_report.cold.9+0x242/0x309 mm/kasan/report.c:412 __asan_report_load_n_noabort+0xf/0x20 mm/kasan/report.c:443 batadv_interface_tx+0x160a/0x18b0 net/batman-adv/soft-interface.c:226 __netdev_start_xmit include/linux/netdevice.h:4382 [inline] netdev_start_xmit include/linux/netdevice.h:4391 [inline] dev_direct_xmit+0x36c/0x6a0 net/core/dev.c:3930 packet_direct_xmit+0xfb/0x170 net/packet/af_packet.c:246 packet_snd net/packet/af_packet.c:2932 [inline] packet_sendmsg+0x298a/0x6ad0 net/packet/af_packet.c:2957 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg+0xd5/0x120 net/socket.c:631 __sys_sendto+0x3d7/0x670 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto net/socket.c:1796 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:1796 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x441ea9 Code: e8 4c ad 02 00 48 83 c4 18 c3 0f 1f 80 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 0f 83 fb 04 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffc72f7fab8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441ea9 RDX: 000000000000000e RSI: 0000000020000180 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 00000000004028c0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7986: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:490 kmem_cache_alloc+0x12e/0x730 mm/slab.c:3554 vm_area_dup+0x7a/0x230 kernel/fork.c:339 __split_vma+0xae/0x570 mm/mmap.c:2648 split_vma+0xa3/0xe0 mm/mmap.c:2706 mprotect_fixup+0x8f1/0xc60 mm/mprotect.c:411 do_mprotect_pkey+0x5d2/0xa60 mm/mprotect.c:555 __do_sys_mprotect mm/mprotect.c:580 [inline] __se_sys_mprotect mm/mprotect.c:577 [inline] __x64_sys_mprotect+0x78/0xb0 mm/mprotect.c:577 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7986: save_stack+0x43/0xd0 mm/kasan/kasan.c:448 set_track mm/kasan/kasan.c:460 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/kasan.c:521 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528 __cache_free mm/slab.c:3498 [inline] kmem_cache_free+0x83/0x290 mm/slab.c:3760 vm_area_free+0x1c/0x20 kernel/fork.c:350 remove_vma+0x13a/0x180 mm/mmap.c:185 exit_mmap+0x364/0x590 mm/mmap.c:3156 __mmput kernel/fork.c:1045 [inline] mmput+0x247/0x610 kernel/fork.c:1066 exit_mm kernel/exit.c:545 [inline] do_exit+0xe74/0x26d0 kernel/exit.c:854 do_group_exit+0x177/0x440 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff88808d5b0000 which belongs to the cache vm_area_struct of size 200 The buggy address is located 3 bytes to the right of 200-byte region [ffff88808d5b0000, ffff88808d5b00c8) The buggy address belongs to the page: page:ffffea0002356c00 count:1 mapcount:0 mapping:ffff88821bc40940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea000285ad48 ffffea00023ae608 ffff88821bc40940 raw: 0000000000000000 ffff88808d5b0000 000000010000000f 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808d5aff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808d5b0000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808d5b0080: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ^ ffff88808d5b0100: fc fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808d5b0180: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ==================================================================