IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready ================================================================== BUG: KASAN: use-after-free in kill_fasync+0x45e/0x470 fs/fcntl.c:1014 Read of size 8 at addr ffff88806e58a168 by task kworker/1:0/22 CPU: 1 PID: 22 Comm: kworker/1:0 Not tainted 5.19.0-rc5-syzkaller-00228-ge5524c2a1fc4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022 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+0xeb/0x495 mm/kasan/report.c:313 print_report mm/kasan/report.c:429 [inline] kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491 kill_fasync+0x45e/0x470 fs/fcntl.c:1014 post_one_notification.isra.0+0x6e4/0x990 kernel/watch_queue.c:128 remove_watch_from_object+0x35a/0x9d0 kernel/watch_queue.c:527 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+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Allocated by task 4400: 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:600 [inline] kzalloc include/linux/slab.h:733 [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+0x46/0xb0 Freed by task 4399: 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+0x166/0x1a0 mm/kasan/common.c:328 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1754 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1780 slab_free mm/slub.c:3536 [inline] kfree+0xd6/0x4d0 mm/slub.c:4584 put_pipe_info fs/pipe.c:711 [inline] pipe_release+0x2b6/0x310 fs/pipe.c:734 __fput+0x277/0x9d0 fs/file_table.c:317 task_work_run+0xdd/0x1a0 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop kernel/entry/common.c:169 [inline] exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201 __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x46/0xb0 The buggy address belongs to the object at ffff88806e58a000 which belongs to the cache kmalloc-cg-512 of size 512 The buggy address is located 360 bytes inside of 512-byte region [ffff88806e58a000, ffff88806e58a200) The buggy address belongs to the physical page: page:ffffea0001b96200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6e588 head:ffffea0001b96200 order:2 compound_mapcount:0 compound_pincount:0 memcg:ffff88806dec9001 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888011842dc0 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff88806dec9001 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 4362, tgid 4361 (syz-executor.5), ts 90294526124, free_ts 87626845778 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x1290/0x3b70 mm/page_alloc.c:4198 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5426 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2272 alloc_slab_page mm/slub.c:1824 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1969 new_slab mm/slub.c:2029 [inline] ___slab_alloc+0x9c4/0xe20 mm/slub.c:3031 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3118 slab_alloc_node mm/slub.c:3209 [inline] __kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4979 kmalloc_reserve net/core/skbuff.c:354 [inline] __alloc_skb+0xde/0x340 net/core/skbuff.c:426 alloc_skb include/linux/skbuff.h:1426 [inline] alloc_skb_with_frags+0x93/0x730 net/core/skbuff.c:5992 sock_alloc_send_pskb+0x793/0x920 net/core/sock.c:2662 unix_dgram_sendmsg+0x425/0x1ad0 net/unix/af_unix.c:1895 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2488 ___sys_sendmsg+0xf3/0x170 net/socket.c:2542 __sys_sendmmsg+0x195/0x470 net/socket.c:2628 __do_sys_sendmmsg net/socket.c:2657 [inline] __se_sys_sendmmsg net/socket.c:2654 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2654 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1371 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x19/0x6a0 mm/page_alloc.c:3438 tipc_exit_net+0x132/0x560 net/tipc/core.c:116 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 process_one_work+0x996/0x1610 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 Memory state around the buggy address: ffff88806e58a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806e58a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806e58a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806e58a180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806e58a200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================