================================================================== BUG: KASAN: use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] BUG: KASAN: use-after-free in do_raw_spin_lock+0x262/0x2b0 kernel/locking/spinlock_debug.c:114 Read of size 4 at addr ffff888078bf6894 by task kworker/1:1/2895 CPU: 1 PID: 2895 Comm: kworker/1:1 Not tainted 5.17.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events key_garbage_collector Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x336 mm/kasan/report.c:255 __kasan_report mm/kasan/report.c:442 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:459 debug_spin_lock_before kernel/locking/spinlock_debug.c:85 [inline] do_raw_spin_lock+0x262/0x2b0 kernel/locking/spinlock_debug.c:114 spin_lock_irq include/linux/spinlock.h:374 [inline] post_one_notification.isra.0+0x59/0x830 kernel/watch_queue.c:86 remove_watch_from_object+0x35a/0x9d0 kernel/watch_queue.c:525 remove_watch_list include/linux/watch_queue.h:115 [inline] key_gc_unused_keys.constprop.0+0x2e5/0x600 security/keys/gc.c:135 key_garbage_collector+0x3d7/0x920 security/keys/gc.c:297 process_one_work+0x9ac/0x1650 kernel/workqueue.c:2307 worker_thread+0x657/0x1110 kernel/workqueue.c:2454 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Allocated by task 11532: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] ____kasan_kmalloc mm/kasan/common.c:515 [inline] ____kasan_kmalloc mm/kasan/common.c:474 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] alloc_pipe_info+0x105/0x590 fs/pipe.c:790 get_pipe_inode fs/pipe.c:881 [inline] create_pipe_files+0x8d/0x880 fs/pipe.c:913 __do_pipe_flags fs/pipe.c:962 [inline] do_pipe2+0x96/0x1b0 fs/pipe.c:1010 __do_sys_pipe2 fs/pipe.c:1028 [inline] __se_sys_pipe2 fs/pipe.c:1026 [inline] __x64_sys_pipe2+0x50/0x70 fs/pipe.c:1026 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 11544: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:45 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free+0x126/0x160 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:236 [inline] slab_free_hook mm/slub.c:1728 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754 slab_free mm/slub.c:3509 [inline] kfree+0xd0/0x390 mm/slub.c:4562 put_pipe_info fs/pipe.c:711 [inline] pipe_release+0x2bf/0x320 fs/pipe.c:734 __fput+0x286/0x9f0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 exit_task_work include/linux/task_work.h:32 [inline] do_exit+0xb29/0x2a30 kernel/exit.c:806 do_group_exit+0xd2/0x2f0 kernel/exit.c:935 get_signal+0x45a/0x2490 kernel/signal.c:2863 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff888078bf6800 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 148 bytes inside of 512-byte region [ffff888078bf6800, ffff888078bf6a00) The buggy address belongs to the page: page:ffffea0001e2fd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x78bf4 head:ffffea0001e2fd00 order:2 compound_mapcount:0 compound_pincount:0 memcg:ffff8880712e9801 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00007a8e00 dead000000000002 ffff888010c42dc0 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff8880712e9801 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3623, ts 151659054628, free_ts 151649741479 prep_new_page mm/page_alloc.c:2434 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4165 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5389 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2271 alloc_slab_page mm/slub.c:1799 [inline] allocate_slab+0x27f/0x3c0 mm/slub.c:1944 new_slab mm/slub.c:2004 [inline] ___slab_alloc+0xbe1/0x12b0 mm/slub.c:3018 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3105 slab_alloc_node mm/slub.c:3196 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc_trace+0x2f8/0x3d0 mm/slub.c:3255 kmalloc include/linux/slab.h:581 [inline] kzalloc include/linux/slab.h:714 [inline] ipv6_add_addr+0x352/0x1f30 net/ipv6/addrconf.c:1092 inet6_addr_add+0x410/0xae0 net/ipv6/addrconf.c:2967 inet6_rtm_newaddr+0xf00/0x1970 net/ipv6/addrconf.c:4909 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5596 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 netlink_unicast_kernel net/netlink/af_netlink.c:1317 [inline] netlink_unicast+0x539/0x7e0 net/netlink/af_netlink.c:1343 netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:705 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:725 __sys_sendto+0x21c/0x320 net/socket.c:2040 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1352 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3325 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3404 __stack_depot_save+0x168/0x500 lib/stackdepot.c:427 kasan_save_stack+0x2e/0x40 mm/kasan/common.c:39 kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:260 [inline] slab_post_alloc_hook mm/slab.h:732 [inline] slab_alloc_node mm/slub.c:3230 [inline] slab_alloc mm/slub.c:3238 [inline] kmem_cache_alloc+0x271/0x4b0 mm/slub.c:3243 kmem_cache_zalloc include/linux/slab.h:704 [inline] lsm_inode_alloc security/security.c:593 [inline] security_inode_alloc+0x34/0x160 security/security.c:1010 inode_init_always+0x5d8/0xd70 fs/inode.c:195 alloc_inode+0x82/0x230 fs/inode.c:267 new_inode_pseudo fs/inode.c:1018 [inline] new_inode+0x27/0x2f0 fs/inode.c:1047 debugfs_get_inode+0x1a/0x130 fs/debugfs/inode.c:72 __debugfs_create_file+0x11a/0x540 fs/debugfs/inode.c:407 debugfs_hw_add+0x15c/0x480 net/mac80211/debugfs.c:663 ieee80211_register_hw+0x1f38/0x3ed0 net/mac80211/main.c:1303 mac80211_hwsim_new_radio+0x24b9/0x4b20 drivers/net/wireless/mac80211_hwsim.c:3493 hwsim_new_radio_nl+0x9bc/0x1080 drivers/net/wireless/mac80211_hwsim.c:4066 Memory state around the buggy address: ffff888078bf6780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888078bf6800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888078bf6880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078bf6900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078bf6980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================