================================================================== BUG: KASAN: use-after-free in __rxrpc_put_peer net/rxrpc/peer_object.c:411 [inline] BUG: KASAN: use-after-free in rxrpc_put_peer+0xb5/0x2c0 net/rxrpc/peer_object.c:435 Read of size 8 at addr ffff888099dc4958 by task syz-executor.1/16132 CPU: 0 PID: 16132 Comm: syz-executor.1 Not tainted 5.3.0-rc6+ #94 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+0x1d8/0x2f8 lib/dump_stack.c:113 print_address_description+0x75/0x5b0 mm/kasan/report.c:351 __kasan_report+0x14b/0x1c0 mm/kasan/report.c:482 kasan_report+0x26/0x50 mm/kasan/common.c:618 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:132 __rxrpc_put_peer net/rxrpc/peer_object.c:411 [inline] rxrpc_put_peer+0xb5/0x2c0 net/rxrpc/peer_object.c:435 rxrpc_rcu_destroy_call+0x56/0x100 net/rxrpc/call_object.c:558 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2114 [inline] rcu_core+0x892/0xf10 kernel/rcu/tree.c:2314 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x227/0x230 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:537 [inline] smp_apic_timer_interrupt+0x113/0x280 arch/x86/kernel/apic/apic.c:1133 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:zap_pte_range mm/memory.c:1044 [inline] RIP: 0010:zap_pmd_range mm/memory.c:1161 [inline] RIP: 0010:zap_pud_range mm/memory.c:1190 [inline] RIP: 0010:zap_p4d_range mm/memory.c:1211 [inline] RIP: 0010:unmap_page_range+0xe58/0x2450 mm/memory.c:1232 Code: 85 0b 0b 00 00 e8 a8 66 d5 ff 49 bc 00 00 00 00 00 fc ff df 48 8b 54 24 18 48 89 d0 48 c1 e8 03 48 89 44 24 38 42 0f b6 04 20 <84> c0 0f 85 c9 0b 00 00 0f b7 1a 83 e3 01 31 ff 89 de e8 81 69 d5 RSP: 0018:ffff88804e7df690 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffff88805f1e6500 RDX: ffff88804e7df960 RSI: 000000000021ffff RDI: 0000000000099841 RBP: ffff88804e7df840 R08: ffffffff819de133 R09: fffff940004cc207 R10: fffff940004cc207 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88804e7df958 R14: 1ffff11009b879f6 R15: 8000000099841007 unmap_single_vma+0x1d4/0x2e0 mm/memory.c:1277 unmap_vmas+0x1b4/0x2b0 mm/memory.c:1309 exit_mmap+0x27b/0x530 mm/mmap.c:3145 __mmput+0x120/0x3a0 kernel/fork.c:1064 mmput+0x5d/0x70 kernel/fork.c:1085 exit_mm+0x50a/0x590 kernel/exit.c:547 do_exit+0x565/0x21a0 kernel/exit.c:866 do_group_exit+0x15c/0x2b0 kernel/exit.c:983 get_signal+0x4ac/0x1d60 kernel/signal.c:2734 do_signal+0x37/0x640 arch/x86/kernel/signal.c:815 exit_to_usermode_loop arch/x86/entry/common.c:159 [inline] prepare_exit_to_usermode+0x303/0x580 arch/x86/entry/common.c:194 syscall_return_slowpath+0x113/0x4a0 arch/x86/entry/common.c:274 do_syscall_64+0x126/0x140 arch/x86/entry/common.c:299 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459879 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd20ec63cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 000000000075bf28 RCX: 0000000000459879 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000075bf28 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000075bf2c R13: 00007fffaaeed67f R14: 00007fd20ec649c0 R15: 000000000075bf2c Allocated by task 16135: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_kmalloc+0x11c/0x1b0 mm/kasan/common.c:493 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:507 kmem_cache_alloc_trace+0x221/0x2f0 mm/slab.c:3550 kmalloc include/linux/slab.h:552 [inline] kzalloc include/linux/slab.h:748 [inline] rxrpc_alloc_local net/rxrpc/local_object.c:79 [inline] rxrpc_lookup_local+0x708/0x16f0 net/rxrpc/local_object.c:277 rxrpc_sendmsg+0x493/0x8b0 net/rxrpc/af_rxrpc.c:566 sock_sendmsg_nosec net/socket.c:637 [inline] sock_sendmsg net/socket.c:657 [inline] ___sys_sendmsg+0x60d/0x910 net/socket.c:2311 __sys_sendmmsg+0x239/0x470 net/socket.c:2413 __do_sys_sendmmsg net/socket.c:2442 [inline] __se_sys_sendmmsg net/socket.c:2439 [inline] __x64_sys_sendmmsg+0xa0/0xb0 net/socket.c:2439 do_syscall_64+0xfe/0x140 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 16: save_stack mm/kasan/common.c:69 [inline] set_track mm/kasan/common.c:77 [inline] __kasan_slab_free+0x12a/0x1e0 mm/kasan/common.c:455 kasan_slab_free+0xe/0x10 mm/kasan/common.c:463 __cache_free mm/slab.c:3425 [inline] kfree+0x115/0x200 mm/slab.c:3756 rxrpc_local_rcu+0x63/0x80 net/rxrpc/local_object.c:496 __rcu_reclaim kernel/rcu/rcu.h:222 [inline] rcu_do_batch kernel/rcu/tree.c:2114 [inline] rcu_core+0x892/0xf10 kernel/rcu/tree.c:2314 rcu_core_si+0x9/0x10 kernel/rcu/tree.c:2323 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 The buggy address belongs to the object at ffff888099dc4940 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 24 bytes inside of 1024-byte region [ffff888099dc4940, ffff888099dc4d40) The buggy address belongs to the page: page:ffffea0002677100 refcount:1 mapcount:0 mapping:ffff8880aa400c40 index:0xffff888099dc56c0 compound_mapcount: 0 flags: 0x1fffc0000010200(slab|head) raw: 01fffc0000010200 ffffea00027f3788 ffffea000271de88 ffff8880aa400c40 raw: ffff888099dc56c0 ffff888099dc4040 0000000100000003 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099dc4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099dc4880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc >ffff888099dc4900: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ^ ffff888099dc4980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099dc4a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================