================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x68/0x1e0 net/bluetooth/hci_core.c:1473 Read of size 8 at addr ffff88801a28d358 by task kworker/1:7/4369 CPU: 1 PID: 4369 Comm: kworker/1:7 Not tainted 5.18.0-syzkaller-10643-g9d004b2f4fea-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x65/0x4b0 mm/kasan/report.c:313 print_report+0xf4/0x210 mm/kasan/report.c:429 kasan_report+0xfb/0x130 mm/kasan/report.c:491 hci_cmd_timeout+0x68/0x1e0 net/bluetooth/hci_core.c:1473 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Allocated by task 3611: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:436 [inline] __kasan_slab_alloc+0xb2/0xe0 mm/kasan/common.c:469 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:750 [inline] slab_alloc_node mm/slub.c:3214 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x199/0x2f0 mm/slub.c:3239 skb_clone+0x1aa/0x370 net/core/skbuff.c:1515 hci_cmd_work+0xbc/0x360 net/bluetooth/hci_core.c:3854 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 Freed by task 4083: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:45 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:370 ____kasan_slab_free+0xd8/0x110 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1727 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kmem_cache_free+0xc7/0x270 mm/slub.c:3524 kfree_skb include/linux/skbuff.h:1375 [inline] hci_dev_open_sync+0x107e/0x1340 net/bluetooth/hci_sync.c:4052 hci_dev_do_open net/bluetooth/hci_core.c:482 [inline] hci_power_on+0x180/0x650 net/bluetooth/hci_core.c:963 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 The buggy address belongs to the object at ffff88801a28d280 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 216 bytes inside of 240-byte region [ffff88801a28d280, ffff88801a28d370) The buggy address belongs to the physical page: page:ffffea000068a340 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1a28d flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000682640 dead000000000005 ffff888140a57500 raw: 0000000000000000 00000000000c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 51, tgid 51 (kworker/u4:2), ts 58236376345, free_ts 58226454515 prep_new_page mm/page_alloc.c:2456 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4198 __alloc_pages+0x259/0x560 mm/page_alloc.c:5426 alloc_slab_page+0x70/0xf0 mm/slub.c:1797 allocate_slab+0x5e/0x520 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x41e/0xcd0 mm/slub.c:3002 __slab_alloc mm/slub.c:3089 [inline] slab_alloc_node mm/slub.c:3180 [inline] kmem_cache_alloc_node+0x287/0x340 mm/slub.c:3264 __alloc_skb+0xd5/0x660 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1426 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_netconf_notify_devconf+0xf8/0x1b0 net/ipv6/addrconf.c:581 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7112 [inline] addrconf_sysctl_unregister net/ipv6/addrconf.c:7136 [inline] addrconf_ifdown+0x18a2/0x1bc0 net/ipv6/addrconf.c:3903 addrconf_notify+0x403/0xf80 notifier_call_chain kernel/notifier.c:84 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:392 call_netdevice_notifiers_info net/core/dev.c:1943 [inline] call_netdevice_notifiers_extack net/core/dev.c:1981 [inline] call_netdevice_notifiers net/core/dev.c:1995 [inline] unregister_netdevice_many+0xeee/0x1950 net/core/dev.c:10834 default_device_exit_batch+0x660/0x6d0 net/core/dev.c:11328 ops_exit_list net/core/net_namespace.c:167 [inline] cleanup_net+0x80c/0xc50 net/core/net_namespace.c:594 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 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+0x812/0x900 mm/page_alloc.c:1421 free_unref_page_prepare mm/page_alloc.c:3343 [inline] free_unref_page+0x7d/0x390 mm/page_alloc.c:3438 mm_free_pgd kernel/fork.c:737 [inline] __mmdrop+0xae/0x3f0 kernel/fork.c:788 mmdrop include/linux/sched/mm.h:50 [inline] mmdrop_sched include/linux/sched/mm.h:78 [inline] finish_task_switch+0x221/0x610 kernel/sched/core.c:5021 context_switch kernel/sched/core.c:5119 [inline] __schedule+0x95f/0xec0 kernel/sched/core.c:6431 schedule+0xeb/0x1b0 kernel/sched/core.c:6503 do_wait+0x7a4/0x9d0 kernel/exit.c:1537 kernel_wait4+0x29c/0x3e0 kernel/exit.c:1681 __do_sys_wait4 kernel/exit.c:1709 [inline] __se_sys_wait4 kernel/exit.c:1705 [inline] __x64_sys_wait4+0x130/0x1e0 kernel/exit.c:1705 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Memory state around the buggy address: ffff88801a28d200: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc ffff88801a28d280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88801a28d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88801a28d380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88801a28d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================