================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x24b/0x250 net/bluetooth/hci_core.c:1495 Read of size 2 at addr ffff88801a66f808 by task kworker/u19:3/3708 CPU: 2 PID: 3708 Comm: kworker/u19:3 Not tainted 6.1.0-rc2-syzkaller-00107-g200204f56f3b #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014 Workqueue: hci4 hci_cmd_timeout Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x15e/0x45d mm/kasan/report.c:395 kasan_report+0xbb/0x1f0 mm/kasan/report.c:495 hci_cmd_timeout+0x24b/0x250 net/bluetooth/hci_core.c:1495 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Allocated by task 63: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] ____kasan_kmalloc mm/kasan/common.c:330 [inline] __kasan_kmalloc+0xa1/0xb0 mm/kasan/common.c:380 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:955 [inline] __kmalloc_node_track_caller+0x55/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] hci_cmd_sync_alloc net/bluetooth/hci_sync.c:54 [inline] hci_cmd_sync_add net/bluetooth/hci_sync.c:95 [inline] __hci_cmd_sync_sk+0x568/0xe20 net/bluetooth/hci_sync.c:157 __hci_cmd_sync_status_sk net/bluetooth/hci_sync.c:246 [inline] __hci_cmd_sync_status net/bluetooth/hci_sync.c:271 [inline] hci_read_local_features_sync+0xc2/0x1e0 net/bluetooth/hci_sync.c:3227 hci_init_stage_sync net/bluetooth/hci_sync.c:3138 [inline] hci_init1_sync net/bluetooth/hci_sync.c:3321 [inline] hci_init_sync net/bluetooth/hci_sync.c:4396 [inline] hci_dev_init_sync net/bluetooth/hci_sync.c:4584 [inline] hci_dev_open_sync+0x1785/0x21a0 net/bluetooth/hci_sync.c:4664 hci_dev_do_open+0x2d/0x70 net/bluetooth/hci_core.c:483 hci_power_on+0xda/0x620 net/bluetooth/hci_core.c:984 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Freed by task 63: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 kasan_set_track+0x21/0x30 mm/kasan/common.c:52 kasan_save_free_info+0x2a/0x40 mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xab/0x3b0 mm/slub.c:3674 skb_free_head+0xac/0x110 net/core/skbuff.c:760 skb_release_data+0x5f1/0x870 net/core/skbuff.c:789 skb_release_all net/core/skbuff.c:854 [inline] __kfree_skb net/core/skbuff.c:868 [inline] kfree_skb_reason+0x186/0x4b0 net/core/skbuff.c:891 kfree_skb include/linux/skbuff.h:1216 [inline] hci_dev_open_sync+0xbec/0x21a0 net/bluetooth/hci_sync.c:4699 hci_dev_do_open+0x2d/0x70 net/bluetooth/hci_core.c:483 hci_power_on+0xda/0x620 net/bluetooth/hci_core.c:984 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 worker_thread+0x665/0x1080 kernel/workqueue.c:2436 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x99/0x820 kernel/rcu/tree.c:2798 fib6_info_release include/net/ip6_fib.h:340 [inline] nsim_rt6_release drivers/net/netdevsim/fib.c:515 [inline] nsim_fib6_event_fini+0x18f/0x240 drivers/net/netdevsim/fib.c:841 nsim_fib_event drivers/net/netdevsim/fib.c:891 [inline] nsim_fib_event_work+0x325/0x24a0 drivers/net/netdevsim/fib.c:1492 process_one_work+0x9bf/0x1710 kernel/workqueue.c:2289 process_scheduled_works kernel/workqueue.c:2352 [inline] worker_thread+0x854/0x1080 kernel/workqueue.c:2438 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 mm/kasan/common.c:45 __kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:481 call_rcu+0x99/0x820 kernel/rcu/tree.c:2798 fib6_info_release include/net/ip6_fib.h:340 [inline] fib6_info_release include/net/ip6_fib.h:337 [inline] ip6_route_info_create+0x1518/0x18f0 net/ipv6/route.c:3829 ip6_route_add+0x24/0x150 net/ipv6/route.c:3843 addrconf_add_mroute+0x1e1/0x310 net/ipv6/addrconf.c:2489 addrconf_add_dev+0x156/0x1c0 net/ipv6/addrconf.c:2507 inet6_addr_add+0x19f/0xae0 net/ipv6/addrconf.c:2937 inet6_rtm_newaddr+0xfa4/0x1a60 net/ipv6/addrconf.c:4927 rtnetlink_rcv_msg+0x43a/0xca0 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 __sys_sendto+0x236/0x340 net/socket.c:2117 __do_compat_sys_socketcall+0x47f/0x660 net/compat.c:473 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 The buggy address belongs to the object at ffff88801a66f800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88801a66f800, ffff88801a66fa00) The buggy address belongs to the physical page: page:ffffea0000699b00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801a66e000 pfn:0x1a66c head:ffffea0000699b00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea00008f9008 ffffea000075d708 ffff888011842c80 raw: ffff88801a66e000 000000000010000f 00000001ffffffff 0000000000000000 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 3702, tgid 3702 (syz-executor.1), ts 195734785077, free_ts 195733594370 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x10b5/0x2d50 mm/page_alloc.c:4287 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5554 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2285 alloc_slab_page mm/slub.c:1794 [inline] allocate_slab+0x213/0x300 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0xa91/0x1400 mm/slub.c:3180 __slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3279 slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x191/0x3e0 mm/slub.c:3437 __do_kmalloc_node mm/slab_common.c:954 [inline] __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1267 [inline] alloc_uevent_skb+0x7b/0x210 lib/kobject_uevent.c:290 uevent_net_broadcast_tagged lib/kobject_uevent.c:351 [inline] kobject_uevent_net_broadcast lib/kobject_uevent.c:412 [inline] kobject_uevent_env+0x110a/0x1640 lib/kobject_uevent.c:593 netdev_queue_add_kobject net/core/net-sysfs.c:1677 [inline] netdev_queue_update_kobjects+0x3d1/0x4e0 net/core/net-sysfs.c:1718 register_queue_kobjects net/core/net-sysfs.c:1779 [inline] netdev_register_kobject+0x330/0x400 net/core/net-sysfs.c:2019 register_netdevice+0xd95/0x1670 net/core/dev.c:10057 veth_newlink+0x4cf/0x990 drivers/net/veth.c:1795 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3581 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1458 [inline] free_pcp_prepare+0x65c/0xd90 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page+0x19/0x4d0 mm/page_alloc.c:3482 qlink_free mm/kasan/quarantine.c:168 [inline] qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x62/0x80 mm/kasan/common.c:302 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slab.h:737 [inline] slab_alloc_node mm/slub.c:3398 [inline] __kmem_cache_alloc_node+0x2da/0x3e0 mm/slub.c:3437 kmalloc_trace+0x22/0x60 mm/slab_common.c:1046 kmalloc include/linux/slab.h:576 [inline] kzalloc include/linux/slab.h:712 [inline] ref_tracker_alloc+0x14c/0x550 lib/ref_tracker.c:85 __netdev_tracker_alloc include/linux/netdevice.h:3995 [inline] netdev_hold include/linux/netdevice.h:4024 [inline] netdev_hold include/linux/netdevice.h:4019 [inline] netdev_queue_add_kobject net/core/net-sysfs.c:1663 [inline] netdev_queue_update_kobjects+0x1a7/0x4e0 net/core/net-sysfs.c:1718 register_queue_kobjects net/core/net-sysfs.c:1779 [inline] netdev_register_kobject+0x330/0x400 net/core/net-sysfs.c:2019 register_netdevice+0xd95/0x1670 net/core/dev.c:10057 veth_newlink+0x4cf/0x990 drivers/net/veth.c:1795 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline] __rtnl_newlink+0x1087/0x17e0 net/core/rtnetlink.c:3581 rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x43a/0xca0 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2540 Memory state around the buggy address: ffff88801a66f700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88801a66f780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88801a66f800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88801a66f880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88801a66f900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================