Enabling of bearer rejected, already enabled 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+0x96b/0xc10 net/tipc/udp_media.c:193 Read of size 8 at addr ffff88803605db20 by task syz-executor.2/17664 CPU: 0 PID: 17664 Comm: syz-executor.2 Not tainted 4.19.206-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+0x96b/0xc10 net/tipc/udp_media.c:193 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:__find_get_block+0x0/0xde0 fs/buffer.c:1290 Code: 0f ff ff ff 48 89 04 24 e8 dd f0 e7 ff 48 8b 04 24 e9 de fe ff ff 48 89 df e8 fc ed e7 ff e9 8b fe ff ff 0f 1f 80 00 00 00 00 <41> 57 41 56 41 55 49 89 f5 41 54 55 53 48 83 ec 30 89 54 24 08 48 RSP: 0018:ffff888028297380 EFLAGS: 00000216 ORIG_RAX: ffffffffffffff13 RAX: 0000000000040000 RBX: ffff8880a3e063c0 RCX: ffffc90007f99000 RDX: 0000000000001000 RSI: 0000000000000390 RDI: ffff888239b45140 RBP: ffff888239b45140 R08: 0000000000000222 R09: 000000000000003f R10: 0000000000000007 R11: 0000000000000000 R12: ffff8880282974f0 R13: 0000000000000390 R14: 0000000000001000 R15: 0000000000000008 __getblk_gfp+0x28/0x70 fs/buffer.c:1317 sb_getblk include/linux/buffer_head.h:333 [inline] __ext4_get_inode_loc+0x351/0x10f0 fs/ext4/inode.c:4621 ext4_get_inode_loc fs/ext4/inode.c:4734 [inline] ext4_reserve_inode_write+0xeb/0x260 fs/ext4/inode.c:5938 ext4_mark_inode_dirty+0x160/0x870 fs/ext4/inode.c:6105 ext4_dirty_inode+0x88/0xb0 fs/ext4/inode.c:6144 __mark_inode_dirty+0x16b/0x1140 fs/fs-writeback.c:2164 mark_inode_dirty include/linux/fs.h:2086 [inline] dquot_alloc_space include/linux/quotaops.h:318 [inline] dquot_alloc_block include/linux/quotaops.h:335 [inline] ext4_mb_new_blocks+0x5b1/0x4370 fs/ext4/mballoc.c:4534 ext4_ext_map_blocks+0x2aa2/0x7390 fs/ext4/extents.c:4493 ext4_map_blocks+0x7a2/0x1a50 fs/ext4/inode.c:657 ext4_getblk+0xad/0x4f0 fs/ext4/inode.c:993 ext4_bread+0x7c/0x210 fs/ext4/inode.c:1043 ext4_append+0x155/0x370 fs/ext4/namei.c:66 ext4_init_new_dir fs/ext4/namei.c:2659 [inline] ext4_mkdir+0x5bd/0xe10 fs/ext4/namei.c:2706 vfs_mkdir+0x508/0x7a0 fs/namei.c:3819 do_mkdirat+0x262/0x2d0 fs/namei.c:3842 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665f9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f8053e3b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffedbc9a85f R14: 00007f8053e3b300 R15: 0000000000022000 Allocated by task 17647: 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:2457 genl_rcv+0x24/0x40 net/netlink/genetlink.c:638 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x4d5/0x690 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x6bb/0xc40 net/netlink/af_netlink.c:1911 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 9117: __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 ffff88803605db00 which belongs to the cache sock_inode_cache of size 992 The buggy address is located 32 bytes inside of 992-byte region [ffff88803605db00, ffff88803605dee0) The buggy address belongs to the page: page:ffffea0000d81740 count:1 mapcount:0 mapping:ffff8880b5b8fc00 index:0xffff88803605dffd flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea000134aa08 ffffea0001347a48 ffff8880b5b8fc00 raw: ffff88803605dffd ffff88803605d200 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88803605da00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ffff88803605da80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88803605db00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88803605db80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88803605dc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== ---------------- Code disassembly (best guess): 0: 0f ff ff ud0 %edi,%edi 3: ff 48 89 decl -0x77(%rax) 6: 04 24 add $0x24,%al 8: e8 dd f0 e7 ff callq 0xffe7f0ea d: 48 8b 04 24 mov (%rsp),%rax 11: e9 de fe ff ff jmpq 0xfffffef4 16: 48 89 df mov %rbx,%rdi 19: e8 fc ed e7 ff callq 0xffe7ee1a 1e: e9 8b fe ff ff jmpq 0xfffffeae 23: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) * 2a: 41 57 push %r15 <-- trapping instruction 2c: 41 56 push %r14 2e: 41 55 push %r13 30: 49 89 f5 mov %rsi,%r13 33: 41 54 push %r12 35: 55 push %rbp 36: 53 push %rbx 37: 48 83 ec 30 sub $0x30,%rsp 3b: 89 54 24 08 mov %edx,0x8(%rsp) 3f: 48 rex.W