================================================================== BUG: KASAN: use-after-free in instrument_atomic_write include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline] BUG: KASAN: use-after-free in refcount_sub_and_test include/linux/refcount.h:266 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:294 [inline] BUG: KASAN: use-after-free in xp_put_pool+0x2c/0x1e0 net/xdp/xsk_buff_pool.c:262 Write of size 4 at addr ffff88805f4c2860 by task syz-executor.0/14631 CPU: 1 PID: 14631 Comm: syz-executor.0 Not tainted 5.9.0-rc1-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+0x18f/0x20d 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_fetch_sub_release include/asm-generic/atomic-instrumented.h:220 [inline] refcount_sub_and_test include/linux/refcount.h:266 [inline] refcount_dec_and_test include/linux/refcount.h:294 [inline] xp_put_pool+0x2c/0x1e0 net/xdp/xsk_buff_pool.c:262 xsk_destruct+0x7d/0xa0 net/xdp/xsk.c:1138 __sk_destruct+0x4b/0x860 net/core/sock.c:1764 rcu_do_batch kernel/rcu/tree.c:2428 [inline] rcu_core+0x5c7/0x1190 kernel/rcu/tree.c:2656 __do_softirq+0x2de/0xa24 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+0x1f3/0x230 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:__sanitizer_cov_trace_pc+0x35/0x60 kernel/kcov.c:200 Code: 05 10 96 8d 7e a9 00 01 ff 00 48 8b 34 24 74 0f f6 c4 01 74 35 8b 82 44 14 00 00 85 c0 74 2b 8b 82 20 14 00 00 83 f8 02 75 20 <48> 8b 8a 28 14 00 00 8b 92 24 14 00 00 48 8b 01 48 83 c0 01 48 39 RSP: 0018:ffffc9000865f8e8 EFLAGS: 00000246 RAX: 0000000000000002 RBX: dffffc0000000000 RCX: ffffc9000641a000 RDX: ffff88809f34e500 RSI: ffffffff81956de8 RDI: 0000000000000005 RBP: ffffea0002082340 R08: 0000000000000001 R09: ffffea0002082377 R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000026f R13: ffffea0002082348 R14: 0000000000000001 R15: ffffea0002082340 filemap_map_pages+0x478/0x12e0 mm/filemap.c:2716 do_fault_around mm/memory.c:3817 [inline] do_read_fault mm/memory.c:3851 [inline] do_fault mm/memory.c:3984 [inline] handle_pte_fault mm/memory.c:4224 [inline] __handle_mm_fault mm/memory.c:4359 [inline] handle_mm_fault+0x4323/0x4590 mm/memory.c:4457 faultin_page mm/gup.c:887 [inline] __get_user_pages+0x724/0x16b0 mm/gup.c:1105 populate_vma_page_range+0x24d/0x330 mm/gup.c:1435 __mm_populate+0x1ea/0x350 mm/gup.c:1483 mm_populate include/linux/mm.h:2559 [inline] vm_mmap_pgoff+0x1de/0x200 mm/util.c:511 ksys_mmap_pgoff+0xde/0x560 mm/mmap.c:1596 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45d5b9 Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fd65150bc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 0000000000020d00 RCX: 000000000045d5b9 RDX: 0000000002000002 RSI: 0000000000b36000 RDI: 0000000020000000 RBP: 000000000118d038 R08: ffffffffffffffff R09: 0000000000000000 R10: 000000000000b871 R11: 0000000000000246 R12: 000000000118cfec R13: 00007ffe635a29af R14: 00007fd65150c9c0 R15: 000000000118cfec Allocated by task 14644: 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 kmalloc_node include/linux/slab.h:577 [inline] kvmalloc_node+0x61/0xf0 mm/util.c:574 kvmalloc include/linux/mm.h:750 [inline] kvzalloc include/linux/mm.h:758 [inline] xp_create_and_assign_umem+0x58/0x8d0 net/xdp/xsk_buff_pool.c:54 xsk_bind+0x9a0/0xed0 net/xdp/xsk.c:709 __sys_bind+0x1e9/0x250 net/socket.c:1656 __do_sys_bind net/socket.c:1667 [inline] __se_sys_bind net/socket.c:1665 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1665 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 Freed by task 14644: 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+0x103/0x2c0 mm/slab.c:3756 kvfree+0x42/0x50 mm/util.c:603 xp_destroy net/xdp/xsk_buff_pool.c:44 [inline] xp_destroy+0x45/0x60 net/xdp/xsk_buff_pool.c:38 xsk_bind+0xbdd/0xed0 net/xdp/xsk.c:719 __sys_bind+0x1e9/0x250 net/socket.c:1656 __do_sys_bind net/socket.c:1667 [inline] __se_sys_bind net/socket.c:1665 [inline] __x64_sys_bind+0x6f/0xb0 net/socket.c:1665 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 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:2894 [inline] call_rcu+0x14f/0x7e0 kernel/rcu/tree.c:2968 in6_dev_finish_destroy+0x143/0x1b0 net/ipv6/addrconf_core.c:264 in6_dev_put include/net/addrconf.h:379 [inline] addrconf_ifdown.isra.0+0x12a3/0x1570 net/ipv6/addrconf.c:3848 addrconf_notify+0x55c/0x2310 net/ipv6/addrconf.c:3627 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2033 call_netdevice_notifiers_extack net/core/dev.c:2045 [inline] call_netdevice_notifiers net/core/dev.c:2059 [inline] rollback_registered_many+0x768/0x1210 net/core/dev.c:9283 rollback_registered net/core/dev.c:9328 [inline] unregister_netdevice_queue+0x2dd/0x570 net/core/dev.c:10409 unregister_netdevice include/linux/netdevice.h:2794 [inline] ppp_release+0x216/0x240 drivers/net/ppp/ppp_generic.c:403 __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:140 [inline] exit_to_user_mode_prepare+0x195/0x1c0 kernel/entry/common.c:167 syscall_exit_to_user_mode+0x59/0x2b0 kernel/entry/common.c:242 entry_SYSCALL_64_after_hwframe+0x44/0xa9 The buggy address belongs to the object at ffff88805f4c2800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 96 bytes inside of 1024-byte region [ffff88805f4c2800, ffff88805f4c2c00) The buggy address belongs to the page: page:00000000a441e4ce refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5f4c2 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002396a08 ffffea00025dc288 ffff8880aa040700 raw: 0000000000000000 ffff88805f4c2000 0000000100000002 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88805f4c2700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88805f4c2780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88805f4c2800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88805f4c2880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88805f4c2900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================