================================================================== 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 ffff88808b9f78c8 by task syz-executor0/11045 CPU: 0 PID: 11045 Comm: syz-executor0 Not tainted 5.0.0-rc4+ #30 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:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] RIP: 0010:_raw_spin_unlock_irqrestore+0x95/0xe0 kernel/locking/spinlock.c:184 Code: 48 c7 c0 f0 81 92 88 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 39 48 83 3d c2 5e 8e 01 00 74 24 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 3c 8b 49 fa 65 8b 05 85 ca fd 78 RSP: 0018:ffff888060137b78 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff112503e RBX: 0000000000000282 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: ffff888060137b88 R08: ffff88806344e5c0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880ae825d40 R13: ffff888060137dc0 R14: 0000000000025d40 R15: ffff8880ae825dc0 unlock_hrtimer_base kernel/time/hrtimer.c:878 [inline] hrtimer_start_range_ns+0x66b/0xc80 kernel/time/hrtimer.c:1109 hrtimer_start_expires include/linux/hrtimer.h:409 [inline] do_nanosleep+0x19b/0x6a0 kernel/time/hrtimer.c:1676 hrtimer_nanosleep+0x2a6/0x570 kernel/time/hrtimer.c:1733 __do_sys_nanosleep kernel/time/hrtimer.c:1767 [inline] __se_sys_nanosleep kernel/time/hrtimer.c:1754 [inline] __x64_sys_nanosleep+0x1a6/0x220 kernel/time/hrtimer.c:1754 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4854d1 Code: 75 14 b8 23 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 e2 f8 ff c3 48 83 ec 08 e8 3a 55 fd ff 48 89 04 24 b8 23 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 83 55 fd ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffdea45cb40 EFLAGS: 00000293 ORIG_RAX: 0000000000000023 RAX: ffffffffffffffda RBX: 000000000002b175 RCX: 00000000004854d1 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007ffdea45cb50 RBP: 000000000073bf00 R08: 00000000d37db732 R09: 00000000d37db736 R10: 00007ffdea45cc30 R11: 0000000000000293 R12: 000000000073c900 R13: 000000000002af64 R14: 00000000000003e8 R15: 000000000073c18c kobject: 'rx-47' (00000000697a59ad): kobject_add_internal: parent: 'queues', set: 'queues' Allocated by task 11072: 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 kobject: 'rx-47' (00000000697a59ad): kobject_uevent_env 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 kobject: 'rx-47' (00000000697a59ad): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-47' 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 kobject: 'rx-48' (00000000ba69f978): kobject_add_internal: parent: 'queues', set: 'queues' entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7825: save_stack+0x45/0xd0 mm/kasan/common.c:73 kobject: 'rx-48' (00000000ba69f978): kobject_uevent_env 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 kobject: 'rx-48' (00000000ba69f978): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-48' 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 kobject: 'rx-49' (00000000c108a3a5): kobject_add_internal: parent: 'queues', set: 'queues' ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88808b9f77c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff88808b9f77c0, ffff88808b9f79c0) The buggy address belongs to the page: page:ffffea00022e7dc0 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 kobject: 'rx-49' (00000000c108a3a5): kobject_uevent_env flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002508408 ffffea000237f1c8 ffff88812c3f0940 raw: 0000000000000000 ffff88808b9f7040 0000000100000006 0000000000000000 kobject: 'rx-49' (00000000c108a3a5): fill_kobj_path: path = '/devices/virtual/net/nr0/queues/rx-49' page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88808b9f7780: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff88808b9f7800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88808b9f7880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ kobject: 'rx-50' (00000000b4081767): kobject_add_internal: parent: 'queues', set: 'queues' ffff88808b9f7900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808b9f7980: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ================================================================== kobject: 'rx-50' (00000000b4081767): kobject_uevent_env