================================================================== 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 ffff8880994166c8 by task syz-executor3/8971 CPU: 1 PID: 8971 Comm: syz-executor3 Not tainted 5.0.0-rc2+ #4 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+0x1db/0x2d0 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+0xc4a/0x1680 kernel/rcu/tree.c:2754 __do_softirq+0x30b/0xb11 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+0x1b7/0x760 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:lock_acquire+0x259/0x570 kernel/locking/lockdep.c:3844 Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 64 02 00 00 48 83 3d 26 31 2e 08 00 0f 84 d0 01 00 00 48 8b bd 48 ff ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 03 85 40 ff ff ff RSP: 0018:ffff888060315f00 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: 1ffffffff1325016 RBX: ffff888060308000 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 000000000000063c RDI: 0000000000000286 RBP: ffff888060315fd0 R08: 0000000000000004 R09: ffff888060308940 R10: ffff888060308920 R11: 0000000000000001 R12: ffff8880a3794c78 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] dd_dispatch_request+0x13e/0xea0 block/mq-deadline.c:392 blk_mq_do_dispatch_sched+0x376/0x550 block/blk-mq-sched.c:102 blk_mq_sched_dispatch_requests+0x5f8/0x970 block/blk-mq-sched.c:210 __blk_mq_run_hw_queue+0x195/0x2e0 block/blk-mq.c:1372 __blk_mq_delay_run_hw_queue+0x4ec/0x5b0 block/blk-mq.c:1440 blk_mq_run_hw_queue+0x1cf/0x3a0 block/blk-mq.c:1477 blk_mq_sched_insert_requests+0xe1/0x1a0 block/blk-mq-sched.c:432 blk_mq_flush_plug_list+0xb1f/0x11d0 block/blk-mq.c:1740 blk_flush_plug_list+0x5de/0x950 block/blk-core.c:1773 blk_mq_make_request+0x865/0x1e10 block/blk-mq.c:1971 generic_make_request+0x902/0x17f0 block/blk-core.c:1086 submit_bio+0xba/0x480 block/blk-core.c:1194 dio_bio_submit fs/direct-io.c:481 [inline] dio_send_cur_page fs/direct-io.c:824 [inline] submit_page_section fs/direct-io.c:881 [inline] do_direct_IO fs/direct-io.c:1095 [inline] do_blockdev_direct_IO+0x8857/0xdc10 fs/direct-io.c:1333 __blockdev_direct_IO+0xa1/0xca fs/direct-io.c:1419 ext4_direct_IO_write fs/ext4/inode.c:3775 [inline] ext4_direct_IO+0x10a3/0x2090 fs/ext4/inode.c:3902 generic_file_direct_write+0x214/0x4b0 mm/filemap.c:3111 __generic_file_write_iter+0x2ee/0x630 mm/filemap.c:3290 ext4_file_write_iter+0x37a/0x1410 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1862 [inline] new_sync_write fs/read_write.c:474 [inline] __vfs_write+0x764/0xb40 fs/read_write.c:487 vfs_write+0x20c/0x580 fs/read_write.c:549 ksys_write+0x105/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457ec9 Code: 6d 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0e97c9dc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000457ec9 RDX: 000000010000000d RSI: 0000000020000000 RDI: 0000000000000006 RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f0e97c9e6d4 R13: 00000000004c71fb R14: 00000000004dcae8 R15: 00000000ffffffff Allocated by task 9019: 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+0x205/0x800 kernel/bpf/devmap.c:88 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create kernel/bpf/syscall.c:510 [inline] __do_sys_bpf+0x6df/0x4410 kernel/bpf/syscall.c:2603 __se_sys_bpf kernel/bpf/syscall.c:2580 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2580 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 2979: 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+0x522/0x6b0 kernel/bpf/devmap.c:192 bpf_map_free_deferred+0xba/0xf0 kernel/bpf/syscall.c:290 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153 worker_thread+0x143/0x14a0 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 ffff8880994165c0 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff8880994165c0, ffff8880994167c0) The buggy address belongs to the page: page:ffffea0002650580 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002572d88 ffffea0002796688 ffff88812c3f0940 raw: 0000000000000000 ffff8880994160c0 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888099416580: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb ffff888099416600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888099416680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888099416700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888099416780: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc 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