team0: Port device team_slave_1 removed
batman_adv: batadv0: Interface deactivated: batadv_slave_0
batman_adv: batadv0: Removing interface: batadv_slave_0
==================================================================
BUG: KASAN: use-after-free in batadv_iv_ogm_schedule+0xd9b/0xdf0 net/batman-adv/bat_iv_ogm.c:951
Write of size 2 at addr ffff88809e97c696 by task kworker/u4:9/10864

CPU: 0 PID: 10864 Comm: kworker/u4:9 Not tainted 4.14.173-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x13e/0x194 lib/dump_stack.c:58
 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252
 kasan_report_error mm/kasan/report.c:351 [inline]
 kasan_report mm/kasan/report.c:409 [inline]
 kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393
 batadv_iv_ogm_schedule+0xd9b/0xdf0 net/batman-adv/bat_iv_ogm.c:951
 batadv_iv_send_outstanding_bat_ogm_packet+0x4ad/0x6a0 net/batman-adv/bat_iv_ogm.c:1809
 process_one_work+0x813/0x1540 kernel/workqueue.c:2114
 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Allocated by task 10675:
 save_stack+0x32/0xa0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc mm/kasan/kasan.c:551 [inline]
 kasan_kmalloc+0xbf/0xe0 mm/kasan/kasan.c:529
 __do_kmalloc mm/slab.c:3720 [inline]
 __kmalloc+0x15b/0x7c0 mm/slab.c:3729
 kmalloc include/linux/slab.h:493 [inline]
 batadv_tvlv_realloc_packet_buff net/batman-adv/tvlv.c:288 [inline]
 batadv_tvlv_container_ogm_append+0x12a/0x490 net/batman-adv/tvlv.c:329
 batadv_iv_ogm_schedule+0xb78/0xdf0 net/batman-adv/bat_iv_ogm.c:945
 batadv_iv_send_outstanding_bat_ogm_packet+0x4ad/0x6a0 net/batman-adv/bat_iv_ogm.c:1809
 process_one_work+0x813/0x1540 kernel/workqueue.c:2114
 worker_thread+0x5d1/0x1070 kernel/workqueue.c:2248
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404

Freed by task 22627:
 save_stack+0x32/0xa0 mm/kasan/kasan.c:447
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0x75/0xc0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xcb/0x260 mm/slab.c:3815
 batadv_iv_ogm_iface_disable+0x34/0x70 net/batman-adv/bat_iv_ogm.c:393
 batadv_hardif_disable_interface.cold+0x61e/0x867 net/batman-adv/hard-interface.c:836
 batadv_softif_slave_del+0x57/0xb0 net/batman-adv/soft-interface.c:915
 do_set_master+0xd0/0x200 net/core/rtnetlink.c:1947
 do_setlink+0x994/0x2c00 net/core/rtnetlink.c:2098
 rtnl_group_changelink net/core/rtnetlink.c:2512 [inline]
 rtnl_newlink+0xbe4/0x1720 net/core/rtnetlink.c:2666
 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4315
 netlink_rcv_skb+0x127/0x370 net/netlink/af_netlink.c:2433
 netlink_unicast_kernel net/netlink/af_netlink.c:1287 [inline]
 netlink_unicast+0x437/0x620 net/netlink/af_netlink.c:1313
 netlink_sendmsg+0x733/0xbe0 net/netlink/af_netlink.c:1878
 sock_sendmsg_nosec net/socket.c:646 [inline]
 sock_sendmsg+0xc5/0x100 net/socket.c:656
 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062
 __sys_sendmsg+0xa3/0x120 net/socket.c:2096
 SYSC_sendmsg net/socket.c:2107 [inline]
 SyS_sendmsg+0x27/0x40 net/socket.c:2103
 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

The buggy address belongs to the object at ffff88809e97c680
 which belongs to the cache kmalloc-64 of size 64
The buggy address is located 22 bytes inside of
 64-byte region [ffff88809e97c680, ffff88809e97c6c0)
The buggy address belongs to the page:
page:ffffea00027a5f00 count:1 mapcount:0 mapping:ffff88809e97c000 index:0xffff88809e97cd00
flags: 0xfffe0000000100(slab)
raw: 00fffe0000000100 ffff88809e97c000 ffff88809e97cd00 000000010000001b
raw: ffffea00029511e0 ffffea00023e5fe0 ffff88812fe56340 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809e97c580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809e97c600: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
>ffff88809e97c680: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
                         ^
 ffff88809e97c700: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
 ffff88809e97c780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
==================================================================