IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): vcan0: link becomes ready
A link change request failed with some changes committed already. Interface caif0 may have been left with an inconsistent configuration, please check.
Subscription rejected, illegal request
==================================================================
BUG: KASAN: use-after-free in tipc_subscrp_subscribe net/tipc/subscr.c:297 [inline]
BUG: KASAN: use-after-free in tipc_subscrb_rcv_cb.cold+0xc2/0xc7 net/tipc/subscr.c:338
Read of size 4 at addr ffff88809716ad04 by task kworker/u4:6/9354

CPU: 1 PID: 9354 Comm: kworker/u4:6 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Workqueue: tipc_rcv tipc_recv_work
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b2/0x281 lib/dump_stack.c:58
 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
 kasan_report mm/kasan/report.c:408 [inline]
 __asan_report_load4_noabort+0x68/0x70 mm/kasan/report.c:428
 tipc_subscrp_subscribe net/tipc/subscr.c:297 [inline]
 tipc_subscrb_rcv_cb.cold+0xc2/0xc7 net/tipc/subscr.c:338
 tipc_receive_from_sock+0x25c/0x450 net/tipc/server.c:273
 tipc_recv_work+0x75/0xd0 net/tipc/server.c:547
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406

Allocated by task 2889:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
 kmem_cache_alloc_trace+0x131/0x3d0 mm/slab.c:3618
 kmalloc include/linux/slab.h:488 [inline]
 kzalloc include/linux/slab.h:661 [inline]
 tipc_subscrb_create net/tipc/subscr.c:223 [inline]
 tipc_subscrb_connect_cb+0x40/0x150 net/tipc/subscr.c:344
 tipc_accept_from_sock+0x25b/0x400 net/tipc/server.c:313
 tipc_recv_work+0x75/0xd0 net/tipc/server.c:547
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406

Freed by task 2889:
 save_stack mm/kasan/kasan.c:447 [inline]
 set_track mm/kasan/kasan.c:459 [inline]
 kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
 __cache_free mm/slab.c:3496 [inline]
 kfree+0xc9/0x250 mm/slab.c:3815
 tipc_subscrb_kref_release net/tipc/subscr.c:155 [inline]
 kref_put include/linux/kref.h:70 [inline]
 tipc_subscrb_put+0x22/0x30 net/tipc/subscr.c:160
 tipc_close_conn+0x16a/0x200 net/tipc/server.c:203
 tipc_send_to_sock net/tipc/server.c:538 [inline]
 tipc_send_work+0x41e/0x520 net/tipc/server.c:564
 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117
 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251
 kthread+0x30d/0x420 kernel/kthread.c:232
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406

The buggy address belongs to the object at ffff88809716ad00
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 4 bytes inside of
 96-byte region [ffff88809716ad00, ffff88809716ad60)
The buggy address belongs to the page:
page:ffffea00025c5a80 count:1 mapcount:0 mapping:ffff88809716a000 index:0xffff88809716a600
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff88809716a000 ffff88809716a600 0000000100000014
raw: ffffea000268fba0 ffffea0002ae0b60 ffff88813fe744c0 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88809716ac00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88809716ac80: 00 00 00 00 00 00 00 00 00 00 fc fc fc fc fc fc
>ffff88809716ad00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                   ^
 ffff88809716ad80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff88809716ae00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
bridge0: port 2(bridge_slave_1) entered disabled state
bridge0: port 1(bridge_slave_0) entered disabled state
batman_adv: batadv0: Interface deactivated: batadv_slave_0