New replicast peer: fe80:0000:0000:0000:0000:0000:0000:0000 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 ffff888049524a20 by task syz-executor.5/17337 CPU: 0 PID: 17337 Comm: syz-executor.5 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:lock_is_held_type+0x0/0x210 kernel/locking/lockdep.c:3939 Code: 00 e9 0a ff ff ff e8 af ad 4d 00 eb 8b e8 88 ac 4d 00 e9 41 ff ff ff e8 0e ad 4d 00 eb ad 66 66 2e 0f 1f 84 00 00 00 00 00 90 <48> b8 00 00 00 00 00 fc ff df 41 54 55 48 89 fd 53 65 48 8b 1c 25 RSP: 0018:ffff88803fa67000 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000001 RBX: 0000000000000003 RCX: 0000000000000000 RDX: 1ffffffff148be2c RSI: 00000000ffffffff RDI: ffffffff89f85f20 RBP: ffff88808d34c240 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: 0000000000000000 R13: ffff8880b149ae94 R14: 0000000000000800 R15: 0000000000000001 lock_is_held include/linux/lockdep.h:344 [inline] rcu_read_lock_sched_held+0x16c/0x1d0 kernel/rcu/update.c:118 trace_block_bio_queue include/trace/events/block.h:357 [inline] generic_make_request_checks+0x1ea9/0x22e0 block/blk-core.c:2346 generic_make_request+0x23f/0xdf0 block/blk-core.c:2412 submit_bio+0xb1/0x430 block/blk-core.c:2576 ext4_io_submit+0x181/0x210 fs/ext4/page-io.c:356 ext4_writepages+0x1130/0x37f0 fs/ext4/inode.c:2837 do_writepages+0xe5/0x290 mm/page-writeback.c:2344 __filemap_fdatawrite_range+0x27d/0x350 mm/filemap.c:446 filemap_write_and_wait_range mm/filemap.c:679 [inline] filemap_write_and_wait_range+0x46/0xd0 mm/filemap.c:673 ext4_direct_IO_read fs/ext4/inode.c:3877 [inline] ext4_direct_IO+0x545/0x1c50 fs/ext4/inode.c:3913 generic_file_read_iter+0x28b/0x2b60 mm/filemap.c:2364 ext4_file_read_iter+0x17b/0x3a0 fs/ext4/file.c:78 call_read_iter include/linux/fs.h:1815 [inline] generic_file_splice_read+0x44a/0x6d0 fs/splice.c:308 do_splice_to+0x10e/0x160 fs/splice.c:881 splice_direct_to_actor+0x2b9/0x8d0 fs/splice.c:959 do_splice_direct+0x1a7/0x270 fs/splice.c:1068 do_sendfile+0x550/0xc30 fs/read_write.c:1447 __do_sys_sendfile64 fs/read_write.c:1508 [inline] __se_sys_sendfile64+0x147/0x160 fs/read_write.c:1494 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f38facd50d9 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:00007f38f9247168 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f38fadf4f80 RCX: 00007f38facd50d9 RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000003 RBP: 00007f38fad30ae9 R08: 0000000000000000 R09: 0000000000000000 R10: 000001ffffffe100 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc6abcd0df R14: 00007f38f9247300 R15: 0000000000022000 Allocated by task 17326: 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 8119: __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 ffff888049524a00 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff888049524a00, ffff888049524de0) The buggy address belongs to the page: page:ffffea0001254900 count:1 mapcount:0 mapping:ffff88823b33a6c0 index:0xffff888049524ffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0001257b48 ffffea000125b7c8 ffff88823b33a6c0 raw: ffff888049524ffd ffff888049524100 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888049524900: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff888049524980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888049524a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888049524a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888049524b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e9 0a ff ff ff jmpq 0xffffff0f 5: e8 af ad 4d 00 callq 0x4dadb9 a: eb 8b jmp 0xffffff97 c: e8 88 ac 4d 00 callq 0x4dac99 11: e9 41 ff ff ff jmpq 0xffffff57 16: e8 0e ad 4d 00 callq 0x4dad29 1b: eb ad jmp 0xffffffca 1d: 66 66 2e 0f 1f 84 00 data16 nopw %cs:0x0(%rax,%rax,1) 24: 00 00 00 00 28: 90 nop * 29: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 30: fc ff df 33: 41 54 push %r12 35: 55 push %rbp 36: 48 89 fd mov %rdi,%rbp 39: 53 push %rbx 3a: 65 gs 3b: 48 rex.W 3c: 8b .byte 0x8b 3d: 1c 25 sbb $0x25,%al