Disabling bearer ================================================================== BUG: KASAN: use-after-free in tipc_udp_xmit+0xa7d/0xc10 net/tipc/udp_media.c:200 Read of size 8 at addr ffff888034109520 by task syz-executor.0/6124 CPU: 0 PID: 6124 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 tipc_udp_xmit+0xa7d/0xc10 net/tipc/udp_media.c:200 tipc_udp_send_msg+0x279/0x490 net/tipc/udp_media.c:248 tipc_bearer_xmit_skb+0x15b/0x330 net/tipc/bearer.c:518 tipc_disc_timeout+0x855/0xc90 net/tipc/discover.c:332 call_timer_fn+0x177/0x700 kernel/time/timer.c:1338 expire_timers+0x243/0x4e0 kernel/time/timer.c:1375 __run_timers kernel/time/timer.c:1696 [inline] run_timer_softirq+0x21c/0x670 kernel/time/timer.c:1709 __do_softirq+0x265/0x980 kernel/softirq.c:292 invoke_softirq kernel/softirq.c:372 [inline] irq_exit+0x215/0x260 kernel/softirq.c:412 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x136/0x550 arch/x86/kernel/apic/apic.c:1098 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894 RIP: 0010:write_comp_data+0x6c/0x70 kernel/kcov.c:146 Code: 00 00 4e 8d 04 dd 28 00 00 00 4c 39 c6 72 1b 48 83 c7 01 4e 89 54 00 e0 4e 89 4c 00 e8 4a 89 54 00 f0 4a 89 4c d8 20 48 89 38 0f 1f 00 48 8b 0c 24 40 0f b6 d6 40 0f b6 f7 31 ff eb 80 48 8b RSP: 0018:ffff88803c3c78f8 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000002 RBX: 1ffff11007878f24 RCX: ffffffff8158819e RDX: 0000000000000001 RSI: ffff8880a1ad6340 RDI: 0000000000000005 RBP: ffff88803c3c79d8 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: 0000000000000001 R15: ffffffff89f886e8 csd_lock_wait kernel/smp.c:108 [inline] smp_call_function_single+0x1ee/0x420 kernel/smp.c:302 _rcu_barrier+0x248/0x3e0 kernel/rcu/tree.c:3479 netdev_run_todo+0x100/0xab0 net/core/dev.c:8972 br_del_bridge+0xd2/0x110 net/bridge/br_if.c:490 br_ioctl_deviceless_stub+0x27f/0x730 net/bridge/br_ioctl.c:380 sock_ioctl+0x2b9/0x5d0 net/socket.c:1102 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0xcdb/0x12e0 fs/ioctl.c:688 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:705 __do_sys_ioctl fs/ioctl.c:712 [inline] __se_sys_ioctl fs/ioctl.c:710 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:710 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fd36123b0d9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fd35f7ad168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fd36135af80 RCX: 00007fd36123b0d9 RDX: 0000000020000680 RSI: 00000000000089a1 RDI: 0000000000000004 RBP: 00007fd361296ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe452d037f R14: 00007fd35f7ad300 R15: 0000000000022000 Allocated by task 6123: kmem_cache_alloc+0x122/0x370 mm/slab.c:3559 sock_alloc_inode+0x19/0x250 net/socket.c:244 alloc_inode+0x5d/0x180 fs/inode.c:211 new_inode_pseudo+0x14/0xe0 fs/inode.c:911 sock_alloc+0x3c/0x260 net/socket.c:567 __sock_create+0xba/0x740 net/socket.c:1329 udp_sock_create6+0xd1/0x550 net/ipv6/ip6_udp_tunnel.c:22 udp_sock_create include/net/udp_tunnel.h:61 [inline] tipc_udp_enable+0xb48/0x14d0 net/tipc/udp_media.c:734 tipc_enable_bearer+0x70f/0xbe0 net/tipc/bearer.c:317 __tipc_nl_bearer_enable+0x2e2/0x3d0 net/tipc/bearer.c:916 tipc_nl_bearer_enable+0x1e/0x30 net/tipc/bearer.c:925 genl_family_rcv_msg+0x642/0xc40 net/netlink/genetlink.c:602 genl_rcv_msg+0xbf/0x160 net/netlink/genetlink.c:627 netlink_rcv_skb+0x160/0x440 net/netlink/af_netlink.c:2463 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1325 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1351 netlink_sendmsg+0x6c3/0xc50 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xc3/0x120 net/socket.c:661 ___sys_sendmsg+0x7bb/0x8e0 net/socket.c:2227 __sys_sendmsg net/socket.c:2265 [inline] __do_sys_sendmsg net/socket.c:2274 [inline] __se_sys_sendmsg net/socket.c:2272 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2272 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 9333: __cache_free mm/slab.c:3503 [inline] kmem_cache_free+0x7f/0x260 mm/slab.c:3765 destroy_inode+0xb9/0x110 fs/inode.c:268 iput_final fs/inode.c:1555 [inline] iput+0x4f1/0x860 fs/inode.c:1581 __sock_release net/socket.c:611 [inline] sock_release+0x174/0x1d0 net/socket.c:619 cleanup_bearer+0x1bb/0x280 net/tipc/udp_media.c:775 process_one_work+0x864/0x1570 kernel/workqueue.c:2153 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 The buggy address belongs to the object at ffff888034109500 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff888034109500, ffff8880341098e0) The buggy address belongs to the page: page:ffffea0000d04240 count:1 mapcount:0 mapping:ffff88823b33a6c0 index:0xffff888034109ffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00022e8088 ffffea00022ed748 ffff88823b33a6c0 raw: ffff888034109ffd ffff888034109080 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888034109400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888034109480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888034109500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888034109580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888034109600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 4e 8d 04 dd 28 00 00 lea 0x28(,%r11,8),%r8 9: 00 a: 4c 39 c6 cmp %r8,%rsi d: 72 1b jb 0x2a f: 48 83 c7 01 add $0x1,%rdi 13: 4e 89 54 00 e0 mov %r10,-0x20(%rax,%r8,1) 18: 4e 89 4c 00 e8 mov %r9,-0x18(%rax,%r8,1) 1d: 4a 89 54 00 f0 mov %rdx,-0x10(%rax,%r8,1) 22: 4a 89 4c d8 20 mov %rcx,0x20(%rax,%r11,8) 27: 48 89 38 mov %rdi,(%rax) * 2a: c3 retq <-- trapping instruction 2b: 0f 1f 00 nopl (%rax) 2e: 48 8b 0c 24 mov (%rsp),%rcx 32: 40 0f b6 d6 movzbl %sil,%edx 36: 40 0f b6 f7 movzbl %dil,%esi 3a: 31 ff xor %edi,%edi 3c: eb 80 jmp 0xffffffbe 3e: 48 rex.W 3f: 8b .byte 0x8b