================================================================== 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 ffff88809632d820 by task syz-executor.4/23321 CPU: 1 PID: 23321 Comm: syz-executor.4 Not tainted 5.9.0-rc8-next-20201006-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:2484 [inline] rcu_core+0x645/0x1240 kernel/rcu/tree.c:2718 __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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:653 [inline] RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x4d/0x90 kernel/locking/spinlock.c:191 Code: 48 c7 c0 28 02 3d 8a 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 3c 48 83 3d e2 20 f5 01 00 74 29 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 24 3e 08 f9 65 8b 05 1d 1d ba 77 RSP: 0018:ffffc900064376c8 EFLAGS: 00000286 RAX: 1ffffffff147a045 RBX: 0000000000000286 RCX: ffffffff815a9ee7 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000286 RBP: ffffffff8dd39928 R08: 0000000000000001 R09: ffffffff8d731ad7 R10: fffffbfff1ae635a R11: 0000000000000357 R12: ffff888094849a00 R13: 1ffff92000c86eeb R14: ffffffff8dd39928 R15: ffffffff8dd39920 __debug_object_init+0x409/0xd10 lib/debugobjects.c:600 debug_object_init lib/debugobjects.c:615 [inline] debug_object_activate+0x32c/0x3e0 lib/debugobjects.c:701 debug_rcu_head_queue kernel/rcu/rcu.h:176 [inline] kvfree_call_rcu+0x32/0xad0 kernel/rcu/tree.c:3445 sctp_bind_addr_clean+0x135/0x1f0 net/sctp/bind_addr.c:125 sctp_association_free+0x294/0x7d0 net/sctp/associola.c:356 sctp_cmd_delete_tcb net/sctp/sm_sideeffect.c:930 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1318 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1185 [inline] sctp_do_sm+0x37dc/0x4e50 net/sctp/sm_sideeffect.c:1156 sctp_primitive_SHUTDOWN+0x9b/0xc0 net/sctp/primitive.c:89 sctp_close+0x3d9/0x8b0 net/sctp/socket.c:1511 inet_release+0x12e/0x280 net/ipv4/af_inet.c:431 inet6_release+0x4c/0x70 net/ipv6/af_inet6.c:475 __sock_release+0xcd/0x280 net/socket.c:596 sock_close+0x18/0x20 net/socket.c:1277 __fput+0x285/0x920 fs/file_table.c:281 task_work_run+0xdd/0x190 kernel/task_work.c:141 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_user_mode_loop kernel/entry/common.c:165 [inline] exit_to_user_mode_prepare+0x1e2/0x1f0 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x7a/0x2c0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x417781 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffcdaf9bf30 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000005 RCX: 0000000000417781 RDX: 0000000000000000 RSI: 0000000000000969 RDI: 0000000000000004 RBP: 0000000000000001 R08: 00000000f14ec96d R09: 0000000000000000 R10: 00007ffcdaf9c010 R11: 0000000000000293 R12: ffffffffffffffff R13: 000000000009fe70 R14: 00000000000003e8 R15: 000000000118bf2c Allocated by task 23319: 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 21909: 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 The buggy address belongs to the object at ffff88809632d800 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 32 bytes inside of 192-byte region [ffff88809632d800, ffff88809632d8c0) The buggy address belongs to the page: page:0000000017345a80 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88809632d700 pfn:0x9632d flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea00022d2a08 ffffea0002531e08 ffff8880aa040000 raw: ffff88809632d700 ffff88809632d000 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809632d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88809632d780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff88809632d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88809632d880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88809632d900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================