================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x24b/0x250 net/bluetooth/hci_core.c:1495 Read of size 2 at addr ffff888078b93808 by task kworker/u5:5/3648 CPU: 0 PID: 3648 Comm: kworker/u5:5 Not tainted 6.1.0-rc1-syzkaller-00249-g4da34b7d175d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Workqueue: hci6 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 3647: 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 3647: 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 insert_work+0x48/0x350 kernel/workqueue.c:1358 __queue_work+0x693/0x13b0 kernel/workqueue.c:1517 call_timer_fn+0x1da/0x7c0 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers.part.0+0x4a3/0xaf0 kernel/time/timer.c:1790 __run_timers kernel/time/timer.c:1768 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571 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 kvfree_call_rcu+0x74/0x8f0 kernel/rcu/tree.c:3341 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1709 unregister_sysctl_table fs/proc/proc_sysctl.c:1747 [inline] unregister_sysctl_table+0xc0/0x190 fs/proc/proc_sysctl.c:1722 netfilter_log_sysctl_exit net/netfilter/nf_log.c:513 [inline] nf_log_net_exit+0x5c/0xe0 net/netfilter/nf_log.c:554 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:162 cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594 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 The buggy address belongs to the object at ffff888078b93800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff888078b93800, ffff888078b93a00) The buggy address belongs to the physical page: page:ffffea0001e2e400 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888078b90000 pfn:0x78b90 head:ffffea0001e2e400 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0000e16408 ffffea0000eb4608 ffff888011841c80 raw: ffff888078b90000 000000000010000d 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 0x1d2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3637, tgid 3637 (syz-executor.2), ts 158605031715, free_ts 154560610738 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] nlmsg_new include/net/netlink.h:964 [inline] inet6_ifa_notify+0x118/0x230 net/ipv6/addrconf.c:5496 __ipv6_ifa_notify net/ipv6/addrconf.c:6144 [inline] ipv6_ifa_notify net/ipv6/addrconf.c:6196 [inline] inet6_addr_add+0x687/0xae0 net/ipv6/addrconf.c:2981 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 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] netdev_name_node_alloc net/core/dev.c:259 [inline] netdev_name_node_head_alloc net/core/dev.c:273 [inline] register_netdevice+0x413/0x1670 net/core/dev.c:9981 nsim_init_netdevsim drivers/net/netdevsim/netdev.c:317 [inline] nsim_create+0x3c3/0x520 drivers/net/netdevsim/netdev.c:365 __nsim_dev_port_add+0x2d7/0x8f0 drivers/net/netdevsim/dev.c:1387 nsim_dev_port_add_all drivers/net/netdevsim/dev.c:1445 [inline] nsim_drv_probe+0xd80/0x1310 drivers/net/netdevsim/dev.c:1599 call_driver_probe drivers/base/dd.c:560 [inline] really_probe+0x249/0xb90 drivers/base/dd.c:639 __driver_probe_device+0x1df/0x4d0 drivers/base/dd.c:778 driver_probe_device+0x4c/0x1a0 drivers/base/dd.c:808 __device_attach_driver+0x1d0/0x2e0 drivers/base/dd.c:936 bus_for_each_drv+0x15f/0x1e0 drivers/base/bus.c:427 Memory state around the buggy address: ffff888078b93700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888078b93780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888078b93800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888078b93880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888078b93900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================