================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [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 ffff8880a7a4e920 by task syz-executor.0/20191 CPU: 1 PID: 20191 Comm: syz-executor.0 Not tainted 5.9.0-rc6-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+0x198/0x1fd lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 check_memory_region_inline mm/kasan/generic.c:186 [inline] check_memory_region+0x13d/0x180 mm/kasan/generic.c:192 instrument_atomic_write include/linux/instrumented.h:71 [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:2428 [inline] rcu_core+0x5ca/0x1130 kernel/rcu/tree.c:2656 __do_softirq+0x1f8/0xb23 kernel/softirq.c:298 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] do_softirq_own_stack+0x9d/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:581 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline] RIP: 0010:lock_acquire+0x27b/0xaf0 kernel/locking/lockdep.c:5032 Code: ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 1d 07 00 00 48 83 3d 68 41 a0 08 00 0f 84 73 05 00 00 4c 89 ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 44 24 08 48 c7 RSP: 0018:ffffc900057f7610 EFLAGS: 00000286 RAX: 1ffffffff13f8d7d RBX: ffff88805608e4c0 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: f407c598391fd4c7 RDI: 0000000000000286 RBP: ffffffff8a068440 R08: 0000000000000000 R09: ffffffff8d10a9e7 R10: fffffbfff1a2153c R11: 0000000000000000 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000286 rcu_lock_acquire include/linux/rcupdate.h:241 [inline] rcu_read_lock include/linux/rcupdate.h:634 [inline] lock_page_memcg+0x63/0x260 mm/memcontrol.c:2094 page_remove_rmap+0x25/0x1690 mm/rmap.c:1328 zap_pte_range mm/memory.c:1093 [inline] zap_pmd_range mm/memory.c:1197 [inline] zap_pud_range mm/memory.c:1226 [inline] zap_p4d_range mm/memory.c:1247 [inline] unmap_page_range+0xf6b/0x2bf0 mm/memory.c:1268 unmap_single_vma+0x198/0x300 mm/memory.c:1313 unmap_vmas+0x168/0x2e0 mm/memory.c:1345 exit_mmap+0x2b1/0x530 mm/mmap.c:3183 __mmput+0x122/0x470 kernel/fork.c:1076 mmput+0x53/0x60 kernel/fork.c:1097 exit_mm kernel/exit.c:483 [inline] do_exit+0xa8b/0x29f0 kernel/exit.c:793 do_group_exit+0x125/0x310 kernel/exit.c:903 get_signal+0x428/0x1f00 kernel/signal.c:2757 arch_do_signal+0x82/0x2520 arch/x86/kernel/signal.c:811 exit_to_user_mode_loop kernel/entry/common.c:161 [inline] exit_to_user_mode_prepare+0x1ae/0x200 kernel/entry/common.c:192 syscall_exit_to_user_mode+0x7e/0x2e0 kernel/entry/common.c:267 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45dd99 Code: Bad RIP value. RSP: 002b:00007f574ce69cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000118bfd0 RCX: 000000000045dd99 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000118bfd4 RBP: 000000000118bfc8 R08: 000000000000000e R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000246 R12: 000000000118bfd4 R13: 00007ffc8eb091cf R14: 00007f574ce6a9c0 R15: 000000000118bfd4 Allocated by task 20189: 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+0x174/0x300 mm/slab.c:3550 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+0xf14/0x136d 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:2353 ___sys_sendmsg+0xf3/0x170 net/socket.c:2407 __sys_sendmmsg+0x195/0x480 net/socket.c:2497 __do_sys_sendmmsg net/socket.c:2526 [inline] __se_sys_sendmmsg net/socket.c:2523 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2523 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 3103: 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:3418 [inline] kfree+0x10e/0x2b0 mm/slab.c:3756 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/0x587 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+0x94c/0x1670 kernel/workqueue.c:2269 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415 kthread+0x3b5/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 The buggy address belongs to the object at ffff8880a7a4e900 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 32 bytes inside of 192-byte region [ffff8880a7a4e900, ffff8880a7a4e9c0) The buggy address belongs to the page: page:00000000ddfafdf6 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa7a4e flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002475fc8 ffffea00027e6708 ffff8880aa040000 raw: 0000000000000000 ffff8880a7a4e000 0000000100000010 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a7a4e800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8880a7a4e880: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff8880a7a4e900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880a7a4e980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff8880a7a4ea00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================