IPv6: ADDRCONF(NETDEV_UP): vxcan1: link is not ready 8021q: adding VLAN 0 to HW filter on device batadv0 ================================================================== BUG: KASAN: use-after-free in batadv_interface_tx+0x160a/0x18b0 net/batman-adv/soft-interface.c:226 Read of size 2 at addr ffff88808d273a4b by task syz-executor938/7811 CPU: 1 PID: 7811 Comm: syz-executor938 Not tainted 4.20.0+ #393 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: 0033:0x441619 Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 3b 0b fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffcedf9a358 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441619 RDX: 000000000000000e RSI: 0000000020000180 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000004025e0 R13: 0000000000402670 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 8015: 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 kmem_cache_alloc_trace+0x152/0x750 mm/slab.c:3620 kmalloc include/linux/slab.h:546 [inline] kzalloc include/linux/slab.h:741 [inline] aa_alloc_file_ctx security/apparmor/include/file.h:60 [inline] apparmor_file_alloc_security+0x17b/0xac0 security/apparmor/lsm.c:440 security_file_alloc+0x4c/0xa0 security/security.c:895 __alloc_file+0x12a/0x470 fs/file_table.c:105 alloc_empty_file+0x72/0x170 fs/file_table.c:150 alloc_file+0x5e/0x4d0 fs/file_table.c:192 alloc_file_pseudo+0x261/0x3f0 fs/file_table.c:231 sock_alloc_file+0x4c/0x180 net/socket.c:394 sock_map_fd net/socket.c:417 [inline] __sys_socket+0x172/0x260 net/socket.c:1351 __do_sys_socket net/socket.c:1356 [inline] __se_sys_socket net/socket.c:1354 [inline] __x64_sys_socket+0x73/0xb0 net/socket.c:1354 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 8015: 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] kfree+0xcf/0x230 mm/slab.c:3817 kzfree+0x28/0x30 mm/slab_common.c:1564 aa_free_file_ctx security/apparmor/include/file.h:76 [inline] apparmor_file_free_security+0x133/0x1a0 security/apparmor/lsm.c:450 security_file_free+0x4a/0x80 security/security.c:900 file_free fs/file_table.c:54 [inline] __fput+0x4e8/0xa50 fs/file_table.c:294 ____fput+0x15/0x20 fs/file_table.c:309 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 exit_task_work include/linux/task_work.h:22 [inline] do_exit+0x1ad6/0x26d0 kernel/exit.c:867 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 ffff88808d273a00 which belongs to the cache kmalloc-96 of size 96 The buggy address is located 75 bytes inside of 96-byte region [ffff88808d273a00, ffff88808d273a60) The buggy address belongs to the page: page:ffffea0002349cc0 count:1 mapcount:0 mapping:ffff88812c3f04c0 index:0xffff88808d273e00 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002a23288 ffffea000233f7c8 ffff88812c3f04c0 raw: ffff88808d273e00 ffff88808d273000 000000010000001a 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808d273900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88808d273980: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff88808d273a00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff88808d273a80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88808d273b00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ==================================================================