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 ffff888060177220 by task syz-executor.0/15926 CPU: 1 PID: 15926 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 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+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:__read_once_size include/linux/compiler.h:263 [inline] RIP: 0010:__lt_find include/linux/rbtree_latch.h:109 [inline] RIP: 0010:latch_tree_find include/linux/rbtree_latch.h:208 [inline] RIP: 0010:bpf_prog_kallsyms_find.part.0+0x47/0x270 kernel/bpf/core.c:512 Code: 96 f5 ff 8b 35 0a ec 73 08 89 f3 89 74 24 0c 83 e3 01 48 8d 3c dd a8 db e0 89 48 8d 6b 05 48 89 f8 48 c1 e8 03 42 80 3c 20 00 <0f> 85 0f 02 00 00 48 8b 2c ed 80 db e0 89 31 ff 48 89 ee e8 51 97 RSP: 0018:ffff8880ab3cf820 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13c1b75 RBX: 0000000000000000 RCX: ffffc90005d2c000 RDX: 0000000000001409 RSI: 0000000000000000 RDI: ffffffff89e0dba8 RBP: 0000000000000005 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000005 R11: 0000000000074071 R12: dffffc0000000000 R13: 00007fdb236e90e9 R14: ffff88813bff04c0 R15: 0000000000000060 bpf_prog_kallsyms_find include/linux/rcupdate.h:628 [inline] is_bpf_text_address+0x196/0x1b0 kernel/bpf/core.c:547 kernel_text_address kernel/extable.c:152 [inline] kernel_text_address+0xbd/0xf0 kernel/extable.c:122 __kernel_text_address+0x9/0x30 kernel/extable.c:107 unwind_get_return_address arch/x86/kernel/unwind_orc.c:297 [inline] unwind_get_return_address+0x51/0x90 arch/x86/kernel/unwind_orc.c:292 __save_stack_trace+0xaf/0x190 arch/x86/kernel/stacktrace.c:45 save_stack mm/kasan/kasan.c:448 [inline] set_track mm/kasan/kasan.c:460 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553 slab_post_alloc_hook mm/slab.h:445 [inline] slab_alloc mm/slab.c:3397 [inline] kmem_cache_alloc_trace+0x11a/0x380 mm/slab.c:3623 kmalloc include/linux/slab.h:515 [inline] kzalloc include/linux/slab.h:709 [inline] aa_alloc_file_ctx security/apparmor/include/file.h:60 [inline] apparmor_file_alloc_security+0x394/0xad0 security/apparmor/lsm.c:438 security_file_alloc+0x40/0x90 security/security.c:880 __alloc_file+0xd8/0x340 fs/file_table.c:105 alloc_empty_file+0x6d/0x170 fs/file_table.c:150 alloc_file+0x5e/0x4d0 fs/file_table.c:192 alloc_file_pseudo+0x165/0x250 fs/file_table.c:231 anon_inode_getfile fs/anon_inodes.c:87 [inline] anon_inode_getfile+0xc8/0x1f0 fs/anon_inodes.c:70 do_epoll_create+0xf8/0x1c0 fs/eventpoll.c:1962 __do_sys_epoll_create1 fs/eventpoll.c:1981 [inline] __se_sys_epoll_create1 fs/eventpoll.c:1979 [inline] __x64_sys_epoll_create1+0x2d/0x40 fs/eventpoll.c:1979 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fdb236e90e9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdb2205e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000123 RAX: ffffffffffffffda RBX: 00007fdb237fbf60 RCX: 00007fdb236e90e9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007fdb2374308d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffebc96096f R14: 00007fdb2205e300 R15: 0000000000022000 Allocated by task 15873: 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 9339: __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 ffff888060177200 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff888060177200, ffff8880601775e0) The buggy address belongs to the page: page:ffffea0001805dc0 count:1 mapcount:0 mapping:ffff88823b33a6c0 index:0xffff888060177ffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0001807448 ffffea0001677748 ffff88823b33a6c0 raw: ffff888060177ffd ffff888060177200 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888060177100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888060177180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888060177200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888060177280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060177300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 96 xchg %eax,%esi 1: f5 cmc 2: ff 8b 35 0a ec 73 decl 0x73ec0a35(%rbx) 8: 08 89 f3 89 74 24 or %cl,0x247489f3(%rcx) e: 0c 83 or $0x83,%al 10: e3 01 jrcxz 0x13 12: 48 8d 3c dd a8 db e0 lea -0x761f2458(,%rbx,8),%rdi 19: 89 1a: 48 8d 6b 05 lea 0x5(%rbx),%rbp 1e: 48 89 f8 mov %rdi,%rax 21: 48 c1 e8 03 shr $0x3,%rax 25: 42 80 3c 20 00 cmpb $0x0,(%rax,%r12,1) * 2a: 0f 85 0f 02 00 00 jne 0x23f <-- trapping instruction 30: 48 8b 2c ed 80 db e0 mov -0x761f2480(,%rbp,8),%rbp 37: 89 38: 31 ff xor %edi,%edi 3a: 48 89 ee mov %rbp,%rsi 3d: e8 .byte 0xe8 3e: 51 push %rcx 3f: 97 xchg %eax,%edi