Enabling of bearer rejected, already enabled 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 ffff88804092f520 by task syz-executor.2/18038 CPU: 0 PID: 18038 Comm: syz-executor.2 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:rcu_lockdep_current_cpu_online+0x28/0x1b0 kernel/rcu/tree.c:1069 Code: 66 90 65 8b 05 d9 a0 b0 7e a9 00 00 10 00 75 0a 8b 05 b0 a1 d5 09 85 c0 75 06 b8 01 00 00 00 c3 41 55 bf 01 00 00 00 41 54 55 <53> 48 83 ec 08 e8 7e 2f f0 ff 48 8b 05 f7 4d a7 08 4c 8d a0 f8 f8 RSP: 0018:ffff88809f13f5d8 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: ffff88809da162c0 RCX: ffffffff81518c83 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001 RBP: ffff8882355a6100 R08: 0000000000000000 R09: ffffed101740455a R10: ffff8880ba022ad3 R11: 0000000000000000 R12: ffff8880a3886000 R13: 0000000000000000 R14: ffff8882355a6780 R15: 0000000000000000 rcu_read_lock_held+0xc3/0x110 kernel/rcu/update.c:285 ext4_get_group_desc+0x351/0x4e0 fs/ext4/balloc.c:284 recently_deleted fs/ext4/ialloc.c:680 [inline] find_inode_bit+0x1a0/0x520 fs/ext4/ialloc.c:724 __ext4_new_inode+0x160c/0x5a20 fs/ext4/ialloc.c:916 ext4_create+0x29e/0x5f0 fs/ext4/namei.c:2517 lookup_open+0x893/0x1a20 fs/namei.c:3235 do_last fs/namei.c:3327 [inline] path_openat+0x1094/0x2df0 fs/namei.c:3537 do_filp_open+0x18c/0x3f0 fs/namei.c:3567 do_sys_open+0x3b3/0x520 fs/open.c:1085 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f34461760d9 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:00007f34446e8168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f3446295f80 RCX: 00007f34461760d9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000300 RBP: 00007f34461d1ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd9ad8374f R14: 00007f34446e8300 R15: 0000000000022000 Allocated by task 18069: 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 3894: __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 ffff88804092f500 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff88804092f500, ffff88804092f8e0) The buggy address belongs to the page: page:ffffea0001024bc0 count:1 mapcount:0 mapping:ffff88823b33a6c0 index:0xffff88804092fffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00022bfc08 ffffea0001294b48 ffff88823b33a6c0 raw: ffff88804092fffd ffff88804092f080 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804092f400: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88804092f480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804092f500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804092f580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804092f600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 66 90 xchg %ax,%ax 2: 65 8b 05 d9 a0 b0 7e mov %gs:0x7eb0a0d9(%rip),%eax # 0x7eb0a0e2 9: a9 00 00 10 00 test $0x100000,%eax e: 75 0a jne 0x1a 10: 8b 05 b0 a1 d5 09 mov 0x9d5a1b0(%rip),%eax # 0x9d5a1c6 16: 85 c0 test %eax,%eax 18: 75 06 jne 0x20 1a: b8 01 00 00 00 mov $0x1,%eax 1f: c3 retq 20: 41 55 push %r13 22: bf 01 00 00 00 mov $0x1,%edi 27: 41 54 push %r12 29: 55 push %rbp * 2a: 53 push %rbx <-- trapping instruction 2b: 48 83 ec 08 sub $0x8,%rsp 2f: e8 7e 2f f0 ff callq 0xfff02fb2 34: 48 8b 05 f7 4d a7 08 mov 0x8a74df7(%rip),%rax # 0x8a74e32 3b: 4c rex.WR 3c: 8d .byte 0x8d 3d: a0 .byte 0xa0 3e: f8 clc 3f: f8 clc