Enabled bearer , priority 10 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 ffff88804943ab20 by task syz-executor.0/25873 CPU: 0 PID: 25873 Comm: syz-executor.0 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 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:recently_deleted fs/ext4/ialloc.c:701 [inline] RIP: 0010:find_inode_bit+0x2e1/0x520 fs/ext4/ialloc.c:724 Code: 03 5e 28 48 8d 7b 14 48 89 f8 48 c1 e8 03 0f b6 14 28 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 e3 01 00 00 8b 5b 14 8a 33 78 ff 49 89 c7 4c 89 f0 48 c1 e8 03 80 3c 28 00 0f 85 ba RSP: 0018:ffff88808c747900 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 0000000063e1873b RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff81dc9283 RDI: ffff888049c16514 RBP: dffffc0000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff888235556740 R13: ffff88808c747ac0 R14: ffff8880494d9000 R15: 0000000000000005 __ext4_new_inode+0x160c/0x5a20 fs/ext4/ialloc.c:916 ext4_mknod+0x2a2/0x5f0 fs/ext4/namei.c:2550 vfs_mknod+0x4f6/0x860 fs/namei.c:3721 unix_mknod net/unix/af_unix.c:1019 [inline] unix_bind+0x76a/0xa40 net/unix/af_unix.c:1060 __sys_bind+0x1e9/0x250 net/socket.c:1594 __do_sys_bind net/socket.c:1605 [inline] __se_sys_bind net/socket.c:1603 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1603 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5a5c4d60c9 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:00007f5a5aa48168 EFLAGS: 00000246 ORIG_RAX: 0000000000000031 RAX: ffffffffffffffda RBX: 00007f5a5c5f5f80 RCX: 00007f5a5c4d60c9 RDX: 000000000000006e RSI: 0000000020003000 RDI: 0000000000000005 RBP: 00007f5a5c531ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd2823ad2f R14: 00007f5a5aa48300 R15: 0000000000022000 Allocated by task 25876: 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 8373: __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 ffff88804943ab00 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff88804943ab00, ffff88804943aee0) The buggy address belongs to the page: page:ffffea0001250e80 count:1 mapcount:0 mapping:ffff8880b5b8fc00 index:0xffff88804943affd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea000125d1c8 ffffea00022d44c8 ffff8880b5b8fc00 raw: ffff88804943affd ffff88804943a200 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804943aa00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88804943aa80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88804943ab00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804943ab80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804943ac00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 03 5e 28 add 0x28(%rsi),%ebx 3: 48 8d 7b 14 lea 0x14(%rbx),%rdi 7: 48 89 f8 mov %rdi,%rax a: 48 c1 e8 03 shr $0x3,%rax e: 0f b6 14 28 movzbl (%rax,%rbp,1),%edx 12: 48 89 f8 mov %rdi,%rax 15: 83 e0 07 and $0x7,%eax 18: 83 c0 03 add $0x3,%eax 1b: 38 d0 cmp %dl,%al 1d: 7c 08 jl 0x27 1f: 84 d2 test %dl,%dl 21: 0f 85 e3 01 00 00 jne 0x20a 27: 8b 5b 14 mov 0x14(%rbx),%ebx * 2a: e8 8a 33 78 ff callq 0xff7833b9 <-- trapping instruction 2f: 49 89 c7 mov %rax,%r15 32: 4c 89 f0 mov %r14,%rax 35: 48 c1 e8 03 shr $0x3,%rax 39: 80 3c 28 00 cmpb $0x0,(%rax,%rbp,1) 3d: 0f .byte 0xf 3e: 85 .byte 0x85 3f: ba .byte 0xba