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 ffff88808d2ee58b by task syz-executor508/8400 CPU: 1 PID: 8400 Comm: syz-executor508 Not tainted 4.20.0+ #362 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: 0033:0x441eb9 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:00007ffd064b8ff8 EFLAGS: 00000212 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441eb9 RDX: 000000000000000e RSI: 0000000020000180 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000 R13: 00000000004028d0 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 7756: 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 kmem_cache_zalloc include/linux/slab.h:731 [inline] __alloc_file+0xa8/0x470 fs/file_table.c:100 alloc_empty_file+0x72/0x170 fs/file_table.c:150 path_openat+0x170/0x5160 fs/namei.c:3523 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x568/0x700 fs/open.c:1063 __do_sys_open fs/open.c:1081 [inline] __se_sys_open fs/open.c:1076 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1076 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7765: 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 file_free_rcu+0x91/0xd0 fs/file_table.c:49 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0xc5b/0x1600 kernel/rcu/tree.c:2754 __do_softirq+0x30c/0xb2e kernel/softirq.c:292 The buggy address belongs to the object at ffff88808d2ee500 which belongs to the cache filp of size 456 The buggy address is located 139 bytes inside of 456-byte region [ffff88808d2ee500, ffff88808d2ee6c8) The buggy address belongs to the page: page:ffffea000234bb80 count:1 mapcount:0 mapping:ffff88821b67b080 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea00022fd148 ffffea0002a51e48 ffff88821b67b080 raw: 0000000000000000 ffff88808d2ee000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808d2ee480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808d2ee500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808d2ee580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808d2ee600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808d2ee680: fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc ==================================================================