================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x239/0x250 net/bluetooth/hci_core.c:1473 Read of size 8 at addr ffff88806e5f15d8 by task kworker/0:3/145 CPU: 0 PID: 145 Comm: kworker/0:3 Not tainted 5.18.0-rc6-next-20220513-syzkaller #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+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 hci_cmd_timeout+0x239/0x250 net/bluetooth/hci_core.c:1473 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:297 Allocated by task 3651: 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_slab_alloc+0x90/0xc0 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+0x204/0x3b0 mm/slub.c:3239 skb_clone+0x170/0x3c0 net/core/skbuff.c:1512 hci_cmd_work+0x191/0x3c0 net/bluetooth/hci_core.c:3853 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:297 Freed by task 3661: 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:1727 [inline] slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1753 slab_free mm/slub.c:3507 [inline] kmem_cache_free+0xdd/0x5a0 mm/slub.c:3524 kfree_skbmem+0xef/0x1b0 net/core/skbuff.c:699 kfree_skb_reason+0x85/0x110 include/linux/refcount.h:279 kfree_skb include/linux/skbuff.h:1374 [inline] hci_dev_open_sync+0xb8c/0x2160 net/bluetooth/hci_sync.c:4053 hci_dev_do_open+0x32/0x70 net/bluetooth/hci_core.c:482 hci_power_on+0x133/0x630 net/bluetooth/hci_core.c:963 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:297 The buggy address belongs to the object at ffff88806e5f1500 which belongs to the cache skbuff_head_cache of size 240 The buggy address is located 216 bytes inside of 240-byte region [ffff88806e5f1500, ffff88806e5f15f0) The buggy address belongs to the physical page: page:ffffea0001b97c40 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x6e5f1 memcg:ffff88805c389f81 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0001f0f180 dead000000000004 ffff888011bdd280 raw: 0000000000000000 00000000000c000c 00000001ffffffff ffff88805c389f81 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 6498, tgid 6492 (syz-executor.3), ts 268266340941, free_ts 267580256113 prep_new_page mm/page_alloc.c:2439 [inline] get_page_from_freelist+0xa25/0x3d00 mm/page_alloc.c:4259 __alloc_pages+0x1c7/0x510 mm/page_alloc.c:5483 alloc_pages+0x1aa/0x310 mm/mempolicy.c:2280 alloc_slab_page mm/slub.c:1797 [inline] allocate_slab+0x26c/0x3c0 mm/slub.c:1942 new_slab mm/slub.c:2002 [inline] ___slab_alloc+0x985/0xd90 mm/slub.c:3002 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3089 slab_alloc_node mm/slub.c:3180 [inline] slab_alloc mm/slub.c:3222 [inline] __kmem_cache_alloc_lru mm/slub.c:3229 [inline] kmem_cache_alloc+0x360/0x3b0 mm/slub.c:3239 skb_clone+0x170/0x3c0 net/core/skbuff.c:1512 __netlink_deliver_tap_skb net/netlink/af_netlink.c:300 [inline] __netlink_deliver_tap net/netlink/af_netlink.c:325 [inline] netlink_deliver_tap+0xa8a/0xc40 net/netlink/af_netlink.c:338 __netlink_sendskb net/netlink/af_netlink.c:1263 [inline] netlink_broadcast_deliver net/netlink/af_netlink.c:1398 [inline] do_one_broadcast net/netlink/af_netlink.c:1476 [inline] netlink_broadcast+0x83c/0xd60 net/netlink/af_netlink.c:1516 nlmsg_multicast include/net/netlink.h:1033 [inline] xfrm_nlmsg_multicast net/xfrm/xfrm_user.c:1191 [inline] xfrm_send_acquire+0x87d/0xb90 net/xfrm/xfrm_user.c:3237 km_query+0xac/0x220 net/xfrm/xfrm_state.c:2247 xfrm_state_find+0x2bfe/0x4f10 net/xfrm/xfrm_state.c:1165 xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2393 [inline] xfrm_tmpl_resolve+0x2f3/0xd40 net/xfrm/xfrm_policy.c:2438 xfrm_resolve_and_create_bundle+0x123/0x2620 net/xfrm/xfrm_policy.c:2728 xfrm_lookup_with_ifid+0x22a/0x2240 net/xfrm/xfrm_policy.c:3062 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1354 [inline] free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1404 free_unref_page_prepare mm/page_alloc.c:3290 [inline] free_unref_page+0x19/0x7b0 mm/page_alloc.c:3405 __unfreeze_partials+0x17c/0x1a0 mm/slub.c:2521 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+0xa2/0xc0 mm/kasan/common.c:446 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] kmem_cache_alloc_node+0x255/0x3f0 mm/slub.c:3264 __alloc_skb+0x215/0x340 net/core/skbuff.c:413 alloc_skb include/linux/skbuff.h:1425 [inline] nlmsg_new include/net/netlink.h:953 [inline] inet6_netconf_notify_devconf+0xa0/0x1e0 net/ipv6/addrconf.c:581 __addrconf_sysctl_unregister net/ipv6/addrconf.c:7112 [inline] addrconf_sysctl_unregister+0x131/0x1c0 net/ipv6/addrconf.c:7136 addrconf_ifdown.isra.0+0x128c/0x1830 net/ipv6/addrconf.c:3903 addrconf_notify+0xeb/0x1ba0 net/ipv6/addrconf.c:3673 notifier_call_chain+0xb5/0x200 kernel/notifier.c:84 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1943 call_netdevice_notifiers_extack net/core/dev.c:1981 [inline] call_netdevice_notifiers net/core/dev.c:1995 [inline] unregister_netdevice_many+0x92e/0x1890 net/core/dev.c:10828 unregister_netdevice_queue net/core/dev.c:10760 [inline] unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:10750 Memory state around the buggy address: ffff88806e5f1480: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc ffff88806e5f1500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806e5f1580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc ^ ffff88806e5f1600: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ffff88806e5f1680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================