================================================================== BUG: KASAN: use-after-free in dev_map_flush_old kernel/bpf/devmap.c:389 [inline] BUG: KASAN: use-after-free in __dev_map_entry_free+0x2a9/0x330 kernel/bpf/devmap.c:403 Read of size 8 at addr ffff888092cbc6c8 by task syz-executor3/10306 CPU: 0 PID: 10306 Comm: syz-executor3 Not tainted 5.0.0-rc4+ #27 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+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 dev_map_flush_old kernel/bpf/devmap.c:389 [inline] __dev_map_entry_free+0x2a9/0x330 kernel/bpf/devmap.c:403 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754 __do_softirq+0x266/0x95a kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline] RIP: 0010:slab_alloc mm/slab.c:3374 [inline] RIP: 0010:kmem_cache_alloc_trace+0x2aa/0x760 mm/slab.c:3607 protocol 88fb is buggy, dev hsr_slave_0 Code: 7e 0f 85 db fe ff ff e8 e5 7e 59 ff e9 d1 fe ff ff e8 7a 5b ce ff 48 83 3d 02 9a eb 06 00 0f 84 90 03 00 00 48 8b 7d c8 57 9d <0f> 1f 44 00 00 e9 61 fe ff ff 31 d2 be a5 01 00 00 48 c7 c7 f2 3a RSP: 0018:ffff8880610078f0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 00000000006080c0 RCX: 1ffff1100bed39ac RDX: 0000000000000000 RSI: ffff88805f69cd40 RDI: 0000000000000282 RBP: ffff888061007960 R08: ffff88805f69c4c0 R09: ffff88805f69cd60 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88812c3f0dc0 R13: ffff88812c3f0dc0 R14: 00000000006080c0 R15: ffff888090eb0a40 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] kobject_uevent_env+0x2fb/0x1030 lib/kobject_uevent.c:516 protocol 88fb is buggy, dev hsr_slave_1 kobject_uevent+0x20/0x26 lib/kobject_uevent.c:638 rx_queue_add_kobject net/core/net-sysfs.c:945 [inline] net_rx_queue_update_kobjects+0x37f/0x4a0 net/core/net-sysfs.c:964 register_queue_kobjects net/core/net-sysfs.c:1535 [inline] netdev_register_kobject+0x28c/0x390 net/core/net-sysfs.c:1755 register_netdevice+0x878/0xff0 net/core/dev.c:8635 tun_set_iff drivers/net/tun.c:2836 [inline] __tun_chr_ioctl+0x2cf0/0x3e50 drivers/net/tun.c:3070 tun_chr_ioctl+0x2b/0x40 drivers/net/tun.c:3342 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:509 [inline] do_vfs_ioctl+0xd6e/0x1390 fs/ioctl.c:696 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713 __do_sys_ioctl fs/ioctl.c:720 [inline] __se_sys_ioctl fs/ioctl.c:718 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457e39 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f7c4441ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457e39 RDX: 0000000020000000 RSI: 00000000400454ca RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7c4441f6d4 R13: 00000000004c22e8 R14: 00000000004d4b80 R15: 00000000ffffffff Allocated by task 10337: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:496 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:469 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:504 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3609 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] dev_map_alloc kernel/bpf/devmap.c:102 [inline] dev_map_alloc+0x1be/0x6e0 kernel/bpf/devmap.c:88 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create kernel/bpf/syscall.c:526 [inline] __do_sys_bpf+0x97b/0x3ea0 kernel/bpf/syscall.c:2642 __se_sys_bpf kernel/bpf/syscall.c:2619 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2619 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7594: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:458 kasan_slab_free+0xe/0x10 mm/kasan/common.c:466 __cache_free mm/slab.c:3487 [inline] kfree+0xcf/0x230 mm/slab.c:3806 dev_map_free+0x43c/0x540 kernel/bpf/devmap.c:192 bpf_map_free_deferred+0xba/0xf0 kernel/bpf/syscall.c:290 process_one_work+0x98e/0x1760 kernel/workqueue.c:2153 worker_thread+0x98/0xe40 kernel/workqueue.c:2296 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff888092cbc5c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff888092cbc5c0, ffff888092cbc7c0) The buggy address belongs to the page: page:ffffea00024b2f00 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0001b0b108 ffffea00021c1b08 ffff88812c3f0940 raw: 0000000000000000 ffff888092cbc0c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888092cbc580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888092cbc600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888092cbc680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888092cbc700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888092cbc780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================