batman_adv: batadv0: Interface deactivated: batadv_slave_1 batman_adv: batadv0: Removing interface: batadv_slave_1 ================================================================== BUG: KASAN: use-after-free in memcpy include/linux/string.h:347 [inline] BUG: KASAN: use-after-free in batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:717 [inline] BUG: KASAN: use-after-free in batadv_iv_ogm_queue_add+0x2c2/0xe30 net/batman-adv/bat_iv_ogm.c:813 Read of size 60 at addr ffff8880a06e2c00 by task kworker/u4:5/7304 CPU: 0 PID: 7304 Comm: kworker/u4:5 Not tainted 4.14.166-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+0x142/0x197 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1dc 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+0xa9/0x2af mm/kasan/report.c:393 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x123/0x190 mm/kasan/kasan.c:267 memcpy+0x24/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:347 [inline] batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:717 [inline] batadv_iv_ogm_queue_add+0x2c2/0xe30 net/batman-adv/bat_iv_ogm.c:813 batadv_iv_ogm_schedule+0xa61/0xe20 net/batman-adv/bat_iv_ogm.c:982 batadv_iv_send_outstanding_bat_ogm_packet+0x4a1/0x680 net/batman-adv/bat_iv_ogm.c:1809 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Allocated by task 7304: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 mm/kasan/kasan.c:447 set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc mm/kasan/kasan.c:551 [inline] kasan_kmalloc+0xce/0xf0 mm/kasan/kasan.c:529 __do_kmalloc mm/slab.c:3720 [inline] __kmalloc+0x15d/0x7a0 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+0x12b/0x480 net/batman-adv/tvlv.c:329 batadv_iv_ogm_schedule+0xba0/0xe20 net/batman-adv/bat_iv_ogm.c:945 batadv_iv_send_outstanding_bat_ogm_packet+0x4a1/0x680 net/batman-adv/bat_iv_ogm.c:1809 process_one_work+0x863/0x1600 kernel/workqueue.c:2114 worker_thread+0x5d9/0x1050 kernel/workqueue.c:2248 kthread+0x319/0x430 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Freed by task 29153: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:59 save_stack+0x45/0xd0 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+0xcc/0x270 mm/slab.c:3815 batadv_iv_ogm_iface_disable+0x39/0x80 net/batman-adv/bat_iv_ogm.c:393 batadv_hardif_disable_interface.cold+0x605/0x840 net/batman-adv/hard-interface.c:836 batadv_softif_destroy_netlink+0xad/0x140 net/batman-adv/soft-interface.c:1134 rtnl_delete_link+0xc3/0x110 net/core/rtnetlink.c:2374 rtnl_dellink+0x206/0x680 net/core/rtnetlink.c:2411 rtnetlink_rcv_msg+0x3da/0xb70 net/core/rtnetlink.c:4306 netlink_rcv_skb+0x14f/0x3c0 net/netlink/af_netlink.c:2432 rtnetlink_rcv+0x1d/0x30 net/core/rtnetlink.c:4318 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x44d/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x7c4/0xc60 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xce/0x110 net/socket.c:656 ___sys_sendmsg+0x70a/0x840 net/socket.c:2062 __sys_sendmsg+0xb9/0x140 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x2d/0x50 net/socket.c:2103 do_syscall_64+0x1e8/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 The buggy address belongs to the object at ffff8880a06e2c00 which belongs to the cache kmalloc-64 of size 64 The buggy address is located 0 bytes inside of 64-byte region [ffff8880a06e2c00, ffff8880a06e2c40) The buggy address belongs to the page: page:ffffea000281b880 count:1 mapcount:0 mapping:ffff8880a06e2000 index:0x0 flags: 0xfffe0000000100(slab) raw: 00fffe0000000100 ffff8880a06e2000 0000000000000000 0000000100000020 raw: ffffea0002356860 ffffea00024cf3e0 ffff8880aa800340 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a06e2b00: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc ffff8880a06e2b80: 00 00 00 00 00 00 00 06 fc fc fc fc fc fc fc fc >ffff8880a06e2c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ^ ffff8880a06e2c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a06e2d00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== SELinux: unrecognized netlink message: protocol=0 nlmsg_type=47348 sclass=netlink_route_socket pig=29189 comm=syz-executor.5 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=47348 sclass=netlink_route_socket pig=29189 comm=syz-executor.5 kauditd_printk_skb: 210 callbacks suppressed audit: type=1400 audit(1579688751.338:27957): avc: denied { map } for pid=29201 comm="blkid" path="/sbin/blkid" dev="sda1" ino=16128 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1