nla_parse: 28 callbacks suppressed netlink: 40 bytes leftover after parsing attributes in process `syz-executor.3'. PF_BRIDGE: RTM_NEWNEIGH with invalid vlan id 0 ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 Read of size 8 at addr ffff88804db3d580 by task syz-executor.5/10595 CPU: 1 PID: 10595 Comm: syz-executor.5 Not tainted 4.14.269-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:252 kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:351 kasan_report mm/kasan/report.c:409 [inline] __asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:430 __lock_acquire+0x2c57/0x3f20 kernel/locking/lockdep.c:3369 lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3998 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x8c/0xc0 kernel/locking/spinlock.c:160 remove_wait_queue+0x1d/0x180 kernel/sched/wait.c:51 ep_remove_wait_queue fs/eventpoll.c:609 [inline] ep_unregister_pollwait.constprop.0+0x9b/0x350 fs/eventpoll.c:627 ep_remove+0x48/0x450 fs/eventpoll.c:790 eventpoll_release_file+0xb9/0x130 fs/eventpoll.c:1018 eventpoll_release include/linux/eventpoll.h:66 [inline] __fput+0x63a/0x7a0 fs/file_table.c:201 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f8007777049 RSP: 002b:00007f80060ec168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007f8007889f60 RCX: 00007f8007777049 RDX: 0000000000000000 RSI: 000000004004743c RDI: 0000000000000003 RBP: 00007f80077d108d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff73b1e8df R14: 00007f80060ec300 R15: 0000000000022000 Allocated by task 10595: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551 __do_kmalloc_node mm/slab.c:3682 [inline] __kmalloc_node+0x4c/0x70 mm/slab.c:3689 kmalloc_node include/linux/slab.h:530 [inline] kvmalloc_node+0x46/0xd0 mm/util.c:397 kvmalloc include/linux/mm.h:531 [inline] kvzalloc include/linux/mm.h:539 [inline] alloc_netdev_mqs+0x76/0xb70 net/core/dev.c:8112 ppp_create_interface drivers/net/ppp/ppp_generic.c:3035 [inline] ppp_unattached_ioctl drivers/net/ppp/ppp_generic.c:869 [inline] ppp_ioctl+0x12e9/0x21e0 drivers/net/ppp/ppp_generic.c:605 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb Freed by task 10595: save_stack mm/kasan/kasan.c:447 [inline] set_track mm/kasan/kasan.c:459 [inline] kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524 __cache_free mm/slab.c:3496 [inline] kfree+0xc9/0x250 mm/slab.c:3815 kvfree+0x45/0x50 mm/util.c:416 device_release+0x15f/0x1a0 drivers/base/core.c:848 kobject_cleanup lib/kobject.c:646 [inline] kobject_release lib/kobject.c:675 [inline] kref_put include/linux/kref.h:70 [inline] kobject_put+0x251/0x550 lib/kobject.c:692 put_device+0x1c/0x30 drivers/base/core.c:2030 free_netdev+0x26f/0x360 net/core/dev.c:8234 ppp_destroy_interface+0x2d7/0x3b0 drivers/net/ppp/ppp_generic.c:3117 ppp_release+0x122/0x1a0 drivers/net/ppp/ppp_generic.c:416 ppp_ioctl+0x522/0x21e0 drivers/net/ppp/ppp_generic.c:631 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb The buggy address belongs to the object at ffff88804db3c9c0 which belongs to the cache kmalloc-4096 of size 4096 The buggy address is located 3008 bytes inside of 4096-byte region [ffff88804db3c9c0, ffff88804db3d9c0) The buggy address belongs to the page: page:ffffea000136cf00 count:1 mapcount:0 mapping:ffff88804db3c9c0 index:0x0 compound_mapcount: 0 flags: 0xfff00000008100(slab|head) raw: 00fff00000008100 ffff88804db3c9c0 0000000000000000 0000000100000001 raw: ffffea00013696a0 ffffea000136e3a0 ffff88813fe74dc0 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88804db3d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804db3d500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88804db3d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88804db3d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88804db3d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================