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 ffff888060e565a0 by task syz-executor.1/19129 CPU: 0 PID: 19129 Comm: syz-executor.1 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:arch_local_save_flags arch/x86/include/asm/paravirt.h:784 [inline] RIP: 0010:arch_local_irq_save arch/x86/include/asm/paravirt.h:806 [inline] RIP: 0010:lock_release+0xb8/0x8b0 kernel/locking/lockdep.c:3923 Code: 85 d0 05 00 00 44 8b 93 84 08 00 00 45 85 d2 0f 85 8b 03 00 00 48 c7 c0 80 82 f1 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 <80> 3c 10 00 0f 85 c3 06 00 00 48 83 3d c6 37 a6 08 00 0f 84 1b 05 RSP: 0018:ffff88806b46eac0 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff13e3050 RBX: ffff8880b521e540 RCX: ffffc90005e3b000 RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffff8880b521edc4 RBP: ffffffff89f85fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000074071 R12: 1ffff1100d68dd5b R13: ffffffff816d1175 R14: ffff88813bff04c0 R15: 0000000000000060 rcu_lock_release include/linux/rcupdate.h:247 [inline] rcu_read_unlock include/linux/rcupdate.h:681 [inline] is_bpf_text_address+0xfc/0x1b0 kernel/bpf/core.c:548 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 __do_kmalloc mm/slab.c:3727 [inline] __kmalloc+0x15a/0x3c0 mm/slab.c:3736 kmalloc_array include/linux/slab.h:637 [inline] kcalloc include/linux/slab.h:648 [inline] ext4_find_extent+0x9bb/0xc70 fs/ext4/extents.c:894 ext4_ext_map_blocks+0x1c0/0x7390 fs/ext4/extents.c:4312 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657 _ext4_get_block+0x208/0x530 fs/ext4/inode.c:810 ext4_get_block_trans+0x165/0x290 fs/ext4/inode.c:871 ext4_dio_get_block_unwritten_async+0x6b/0x250 fs/ext4/inode.c:904 get_more_blocks fs/direct-io.c:717 [inline] do_direct_IO fs/direct-io.c:1003 [inline] do_blockdev_direct_IO fs/direct-io.c:1333 [inline] __blockdev_direct_IO+0x424b/0xef40 fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3777 [inline] ext4_direct_IO+0xae4/0x1c50 fs/ext4/inode.c:3915 generic_file_direct_write+0x208/0x4a0 mm/filemap.c:3073 __generic_file_write_iter+0x2d0/0x610 mm/filemap.c:3252 ext4_file_write_iter+0x957/0xf20 fs/ext4/file.c:272 call_write_iter include/linux/fs.h:1821 [inline] aio_write+0x37f/0x5c0 fs/aio.c:1574 __io_submit_one fs/aio.c:1858 [inline] io_submit_one+0xecd/0x20c0 fs/aio.c:1909 __do_sys_io_submit fs/aio.c:1953 [inline] __se_sys_io_submit+0x11b/0x4a0 fs/aio.c:1924 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f231ecb80c9 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:00007f231d22a168 EFLAGS: 00000246 ORIG_RAX: 00000000000000d1 RAX: ffffffffffffffda RBX: 00007f231edd7f80 RCX: 00007f231ecb80c9 RDX: 0000000020000540 RSI: 0000000000000008 RDI: 00007f231edb9000 RBP: 00007f231ed13ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe9114b41f R14: 00007f231d22a300 R15: 0000000000022000 Allocated by task 19123: 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 9317: __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 ffff888060e56580 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff888060e56580, ffff888060e56960) The buggy address belongs to the page: page:ffffea0001839580 count:1 mapcount:0 mapping:ffff8880b5b8fc00 index:0xffff888060e56ffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea00022c8848 ffffea00022c1348 ffff8880b5b8fc00 raw: ffff888060e56ffd ffff888060e56100 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888060e56480: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888060e56500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888060e56580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888060e56600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888060e56680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 85 d0 test %edx,%eax 2: 05 00 00 44 8b add $0x8b440000,%eax 7: 93 xchg %eax,%ebx 8: 84 08 test %cl,(%rax) a: 00 00 add %al,(%rax) c: 45 85 d2 test %r10d,%r10d f: 0f 85 8b 03 00 00 jne 0x3a0 15: 48 c7 c0 80 82 f1 89 mov $0xffffffff89f18280,%rax 1c: 48 ba 00 00 00 00 00 movabs $0xdffffc0000000000,%rdx 23: fc ff df 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 10 00 cmpb $0x0,(%rax,%rdx,1) <-- trapping instruction 2e: 0f 85 c3 06 00 00 jne 0x6f7 34: 48 83 3d c6 37 a6 08 cmpq $0x0,0x8a637c6(%rip) # 0x8a63802 3b: 00 3c: 0f .byte 0xf 3d: 84 1b test %bl,(%rbx) 3f: 05 .byte 0x5