================================================================== BUG: KASAN: slab-use-after-free in skb_queue_empty_lockless include/linux/skbuff.h:1869 [inline] BUG: KASAN: slab-use-after-free in skb_queue_purge_reason+0x37d/0x410 net/core/skbuff.c:3896 Read of size 8 at addr ffff888026176858 by task syz.0.2350/14095 CPU: 1 UID: 0 PID: 14095 Comm: syz.0.2350 Not tainted 6.11.0-rc1-syzkaller-00062-ge4fc196f5ba3 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 skb_queue_empty_lockless include/linux/skbuff.h:1869 [inline] skb_queue_purge_reason+0x37d/0x410 net/core/skbuff.c:3896 vhci_flush+0x40/0x50 drivers/bluetooth/hci_vhci.c:65 hci_dev_do_reset net/bluetooth/hci_core.c:559 [inline] hci_dev_reset+0x22e/0x530 net/bluetooth/hci_core.c:599 hci_sock_ioctl+0x3d2/0x880 net/bluetooth/hci_sock.c:1133 sock_do_ioctl+0x116/0x280 net/socket.c:1222 sock_ioctl+0x22e/0x6c0 net/socket.c:1341 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f12abd773b9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f12acbf2048 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f12abf06058 RCX: 00007f12abd773b9 RDX: 0000000000000000 RSI: 00000000400448cb RDI: 0000000000000006 RBP: 00007f12abde48e6 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f12abf06058 R15: 00007fff5c307e78 Allocated by task 13961: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:370 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387 kmalloc_noprof include/linux/slab.h:681 [inline] kzalloc_noprof include/linux/slab.h:807 [inline] vhci_open+0x4c/0x440 drivers/bluetooth/hci_vhci.c:636 misc_open+0x3da/0x4c0 drivers/char/misc.c:165 chrdev_open+0x26d/0x6f0 fs/char_dev.c:414 do_dentry_open+0x91f/0x15f0 fs/open.c:959 vfs_open+0x82/0x3f0 fs/open.c:1089 do_open fs/namei.c:3727 [inline] path_openat+0x2141/0x2d20 fs/namei.c:3886 do_filp_open+0x1dc/0x430 fs/namei.c:3913 do_sys_openat2+0x17a/0x1e0 fs/open.c:1416 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x175/0x210 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 14239: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579 poison_slab_object+0xf7/0x160 mm/kasan/common.c:240 __kasan_slab_free+0x32/0x50 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kfree+0x12a/0x3b0 mm/slub.c:4594 vhci_release+0xc4/0x100 drivers/bluetooth/hci_vhci.c:672 __fput+0x408/0xbb0 fs/file_table.c:422 task_work_run+0x14e/0x250 kernel/task_work.c:228 exit_task_work include/linux/task_work.h:40 [inline] do_exit+0xaa3/0x2bb0 kernel/exit.c:882 do_group_exit+0xd3/0x2a0 kernel/exit.c:1031 get_signal+0x25fd/0x2770 kernel/signal.c:2917 arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:111 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888026176800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 88 bytes inside of freed 1024-byte region [ffff888026176800, ffff888026176c00) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26170 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xfdffffff(slab) raw: 00fff00000000040 ffff888015842dc0 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000040 ffff888015842dc0 dead000000000100 dead000000000122 head: 0000000000000000 0000000000100010 00000001fdffffff 0000000000000000 head: 00fff00000000003 ffffea0000985c01 ffffffffffffffff 0000000000000000 head: 0000000000000008 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0x1d2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 1106, tgid 1106 (kworker/u32:7), ts 334282632566, free_ts 334187430038 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3442 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4700 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline] alloc_pages_node_noprof include/linux/gfp.h:296 [inline] alloc_slab_page+0x4e/0xf0 mm/slub.c:2321 allocate_slab mm/slub.c:2484 [inline] new_slab+0x84/0x260 mm/slub.c:2537 ___slab_alloc+0xdac/0x1870 mm/slub.c:3723 __slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3813 __slab_alloc_node mm/slub.c:3866 [inline] slab_alloc_node mm/slub.c:4025 [inline] __do_kmalloc_node mm/slub.c:4157 [inline] __kmalloc_node_track_caller_noprof+0x355/0x430 mm/slub.c:4177 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:605 __alloc_skb+0x164/0x380 net/core/skbuff.c:674 alloc_skb include/linux/skbuff.h:1320 [inline] nlmsg_new include/net/netlink.h:1015 [inline] inet6_rt_notify+0xf0/0x2c0 net/ipv6/route.c:6180 fib6_del_route net/ipv6/ip6_fib.c:2012 [inline] fib6_del+0xf08/0x17b0 net/ipv6/ip6_fib.c:2047 fib6_clean_node+0x426/0x5b0 net/ipv6/ip6_fib.c:2209 fib6_walk_continue+0x44f/0x8d0 net/ipv6/ip6_fib.c:2131 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2179 fib6_clean_tree+0xd7/0x120 net/ipv6/ip6_fib.c:2259 page last free pid 1106 tgid 1106 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1094 [inline] free_unref_page+0x64a/0xe40 mm/page_alloc.c:2612 __put_partials+0x14c/0x170 mm/slub.c:3051 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3988 [inline] slab_alloc_node mm/slub.c:4037 [inline] kmem_cache_alloc_node_noprof+0x153/0x310 mm/slub.c:4080 __alloc_skb+0x2b1/0x380 net/core/skbuff.c:664 alloc_skb include/linux/skbuff.h:1320 [inline] nlmsg_new include/net/netlink.h:1015 [inline] rtmsg_ifinfo_build_skb+0x81/0x280 net/core/rtnetlink.c:4070 rtmsg_ifinfo_event net/core/rtnetlink.c:4113 [inline] rtmsg_ifinfo_event net/core/rtnetlink.c:4103 [inline] rtmsg_ifinfo+0x9f/0x1a0 net/core/rtnetlink.c:4122 dev_close_many+0x318/0x6a0 net/core/dev.c:1586 unregister_netdevice_many_notify+0x477/0x1e40 net/core/dev.c:11318 unregister_netdevice_many net/core/dev.c:11405 [inline] default_device_exit_batch+0x85b/0xae0 net/core/dev.c:11888 ops_exit_list+0x128/0x180 net/core/net_namespace.c:178 cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390 Memory state around the buggy address: ffff888026176700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888026176780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888026176800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888026176880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888026176900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================