================================================================== BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:101 [inline] BUG: KASAN: use-after-free in atomic_dec_return include/asm-generic/atomic-instrumented.h:340 [inline] BUG: KASAN: use-after-free in rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:141 Write of size 4 at addr ffff88808ce05c20 by task systemd-udevd/3924 CPU: 1 PID: 3924 Comm: systemd-udevd Not tainted 5.9.0-rc7-next-20201002-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+0x198/0x1fb lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:562 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_read_write include/linux/instrumented.h:101 [inline] atomic_dec_return include/asm-generic/atomic-instrumented.h:340 [inline] rxrpc_put_bundle+0x1d/0x80 net/rxrpc/conn_client.c:141 rxrpc_destroy_connection+0x150/0x2f0 net/rxrpc/conn_object.c:367 rcu_do_batch kernel/rcu/tree.c:2481 [inline] rcu_core+0x645/0x1240 kernel/rcu/tree.c:2715 __do_softirq+0x203/0xab6 kernel/softirq.c:298 asm_call_irq_on_stack+0xf/0x20 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline] do_softirq_own_stack+0x9b/0xd0 arch/x86/kernel/irq_64.c:77 invoke_softirq kernel/softirq.c:393 [inline] __irq_exit_rcu kernel/softirq.c:423 [inline] irq_exit_rcu+0x235/0x280 kernel/softirq.c:435 sysvec_apic_timer_interrupt+0x51/0xf0 arch/x86/kernel/apic/apic.c:1091 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:631 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x60 kernel/kcov.c:197 Code: 5d be 03 00 00 00 e9 76 4b 47 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 48 8b 14 25 c0 fe 01 00 <65> 8b 05 80 b7 8c 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 RSP: 0018:ffffc90000f07868 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000005 RCX: ffffffff83863187 RDX: ffff88809f43c140 RSI: ffff88809f43c140 RDI: 0000000000000005 RBP: ffff8880a0720700 R08: 0000000000000001 R09: ffffffff8dc69627 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000000002a5 R14: dffffc0000000000 R15: 0000000000000000 tomoyo_domain_quota_is_ok+0x31a/0x550 security/tomoyo/util.c:1087 tomoyo_supervisor+0x2f2/0xef0 security/tomoyo/common.c:2089 tomoyo_audit_path_log security/tomoyo/file.c:168 [inline] tomoyo_path_permission security/tomoyo/file.c:587 [inline] tomoyo_path_permission+0x270/0x3a0 security/tomoyo/file.c:573 tomoyo_path_perm+0x2f0/0x400 security/tomoyo/file.c:838 security_inode_getattr+0xcf/0x140 security/security.c:1278 vfs_getattr fs/stat.c:121 [inline] vfs_statx+0x164/0x390 fs/stat.c:189 vfs_fstatat fs/stat.c:207 [inline] vfs_lstat include/linux/fs.h:3152 [inline] __do_sys_newlstat+0x91/0x110 fs/stat.c:362 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7fda919b5335 Code: 69 db 2b 00 64 c7 00 16 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 83 ff 01 48 89 f0 77 30 48 89 c7 48 89 d6 b8 06 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 03 f3 c3 90 48 8b 15 31 db 2b 00 f7 d8 64 89 RSP: 002b:00007ffc87258038 EFLAGS: 00000246 ORIG_RAX: 0000000000000006 RAX: ffffffffffffffda RBX: 000055bd6025e150 RCX: 00007fda919b5335 RDX: 00007ffc87258070 RSI: 00007ffc87258070 RDI: 000055bd6025d150 RBP: 00007ffc87258130 R08: 00007fda91c74178 R09: 0000000000001010 R10: 0000000000000100 R11: 0000000000000246 R12: 000055bd6025d150 R13: 000055bd6025d175 R14: 000055bd602684b4 R15: 000055bd602684b5 Allocated by task 17251: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461 kmem_cache_alloc_trace+0x1a0/0x480 mm/slab.c:3552 kmalloc include/linux/slab.h:554 [inline] kzalloc include/linux/slab.h:666 [inline] rxrpc_alloc_bundle+0x88/0x2c0 net/rxrpc/conn_client.c:121 rxrpc_look_up_bundle net/rxrpc/conn_client.c:275 [inline] rxrpc_prep_call net/rxrpc/conn_client.c:374 [inline] rxrpc_connect_call+0x85c/0x1580 net/rxrpc/conn_client.c:710 rxrpc_new_client_call+0x961/0x1020 net/rxrpc/call_object.c:331 rxrpc_new_client_call_for_sendmsg net/rxrpc/sendmsg.c:622 [inline] rxrpc_do_sendmsg+0xf14/0x1370 net/rxrpc/sendmsg.c:679 rxrpc_sendmsg+0x420/0x630 net/rxrpc/af_rxrpc.c:560 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 ____sys_sendmsg+0x331/0x810 net/socket.c:2362 ___sys_sendmsg+0xf3/0x170 net/socket.c:2416 __sys_sendmmsg+0x196/0x4b0 net/socket.c:2506 __do_sys_sendmmsg net/socket.c:2535 [inline] __se_sys_sendmmsg net/socket.c:2532 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2532 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 2633: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422 __cache_free mm/slab.c:3420 [inline] kfree+0x10e/0x2a0 mm/slab.c:3758 rxrpc_put_bundle net/rxrpc/conn_client.c:146 [inline] rxrpc_put_bundle+0x6b/0x80 net/rxrpc/conn_client.c:138 rxrpc_unbundle_conn+0x1f8/0x3d0 net/rxrpc/conn_client.c:935 rxrpc_clean_up_local_conns+0x38d/0x590 net/rxrpc/conn_client.c:1114 rxrpc_local_destroyer net/rxrpc/local_object.c:399 [inline] rxrpc_local_processor+0x38d/0x5e0 net/rxrpc/local_object.c:433 process_one_work+0x933/0x15a0 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Last call_rcu(): kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48 kasan_record_aux_stack+0x82/0xb0 mm/kasan/generic.c:346 __call_rcu kernel/rcu/tree.c:2957 [inline] call_rcu+0x15e/0x7d0 kernel/rcu/tree.c:3030 tnode_free+0x99/0x100 net/ipv4/fib_trie.c:495 replace+0x134/0x470 net/ipv4/fib_trie.c:521 inflate net/ipv4/fib_trie.c:623 [inline] resize+0xeaf/0x1f80 net/ipv4/fib_trie.c:868 trie_rebalance net/ipv4/fib_trie.c:1059 [inline] fib_insert_node net/ipv4/fib_trie.c:1103 [inline] fib_insert_alias+0xaa2/0xd60 net/ipv4/fib_trie.c:1117 fib_table_insert+0x926/0x1af0 net/ipv4/fib_trie.c:1328 fib_magic+0x3b9/0x520 net/ipv4/fib_frontend.c:1085 fib_add_ifaddr+0x16c/0x520 net/ipv4/fib_frontend.c:1107 fib_inetaddr_event+0x162/0x2a0 net/ipv4/fib_frontend.c:1420 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 blocking_notifier_call_chain kernel/notifier.c:337 [inline] blocking_notifier_call_chain+0x67/0x90 kernel/notifier.c:325 __inet_insert_ifa+0x914/0xc10 net/ipv4/devinet.c:553 inet_rtm_newaddr+0xccb/0x1330 net/ipv4/devinet.c:957 rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5563 netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2489 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:651 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:671 __sys_sendto+0x21c/0x320 net/socket.c:1992 __do_sys_sendto net/socket.c:2004 [inline] __se_sys_sendto net/socket.c:2000 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2000 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88808ce05c00 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 32 bytes inside of 192-byte region [ffff88808ce05c00, ffff88808ce05cc0) The buggy address belongs to the page: page:00000000c92f8222 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8ce05 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002696c88 ffffea00024f2988 ffff8880aa040000 raw: 0000000000000000 ffff88808ce05000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808ce05b00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808ce05b80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88808ce05c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808ce05c80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88808ce05d00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================