================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1495 Read of size 2 at addr ffff888056f73408 by task kworker/u5:0/309 CPU: 0 PID: 309 Comm: kworker/u5:0 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: hci7 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:317 print_report+0x108/0x220 mm/kasan/report.c:433 kasan_report+0xfb/0x130 mm/kasan/report.c:495 hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1495 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 arch/x86/entry/entry_64.S:306 Allocated by task 340: 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:437 [inline] ____kasan_kmalloc+0xdc/0x110 mm/kasan/common.c:516 kasan_kmalloc include/linux/kasan.h:234 [inline] __kmalloc_node_track_caller+0x265/0x400 mm/slub.c:4969 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1265 [inline] bt_skb_alloc include/net/bluetooth/bluetooth.h:469 [inline] hci_cmd_sync_alloc+0x39/0x340 net/bluetooth/hci_sync.c:54 hci_cmd_sync_add+0xaa/0x240 net/bluetooth/hci_sync.c:95 __hci_cmd_sync_sk+0xdf/0x680 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 net/bluetooth/hci_sync.c:3227 [inline] hci_init_stage_sync net/bluetooth/hci_sync.c:3138 [inline] hci_init1_sync+0x1d6/0x6d0 net/bluetooth/hci_sync.c:3321 hci_init_sync net/bluetooth/hci_sync.c:4396 [inline] hci_dev_init_sync+0x24a/0x6b0 net/bluetooth/hci_sync.c:4584 hci_dev_open_sync+0x34e/0x8e0 net/bluetooth/hci_sync.c:4664 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:984 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 arch/x86/entry/entry_64.S:306 Freed by task 340: 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+0xd8/0x120 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:200 [inline] slab_free_hook mm/slub.c:1759 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1785 slab_free mm/slub.c:3539 [inline] kfree+0xda/0x210 mm/slub.c:4567 skb_free_head net/core/skbuff.c:760 [inline] skb_release_data+0x536/0x6d0 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+0xd3/0x290 net/core/skbuff.c:891 kfree_skb include/linux/skbuff.h:1214 [inline] hci_dev_open_sync+0x622/0x8e0 net/bluetooth/hci_sync.c:4699 hci_dev_do_open net/bluetooth/hci_core.c:483 [inline] hci_power_on+0x16a/0x610 net/bluetooth/hci_core.c:984 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 arch/x86/entry/entry_64.S:306 Last potentially related work creation: kasan_save_stack+0x3b/0x60 mm/kasan/common.c:38 __kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:348 call_rcu+0x163/0x9c0 kernel/rcu/tree.c:2796 fib6_info_release include/net/ip6_fib.h:340 [inline] fixup_permanent_addr net/ipv6/addrconf.c:3472 [inline] addrconf_permanent_addr+0x29d/0x700 net/ipv6/addrconf.c:3500 addrconf_notify+0x881/0xfe0 net/ipv6/addrconf.c:3572 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 __dev_notify_flags+0x2ef/0x5f0 dev_change_flags+0xe3/0x190 net/core/dev.c:8615 do_setlink+0xf36/0x3f10 net/core/rtnetlink.c:2788 __rtnl_newlink net/core/rtnetlink.c:3547 [inline] rtnl_newlink+0x183e/0x2060 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x7b8/0xe90 net/core/rtnetlink.c:6091 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2540 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7e7/0x9c0 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x9b3/0xcd0 net/netlink/af_netlink.c:1921 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg net/socket.c:734 [inline] __sys_sendto+0x46d/0x5f0 net/socket.c:2117 __do_sys_sendto net/socket.c:2129 [inline] __se_sys_sendto net/socket.c:2125 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2125 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+0x63/0xcd The buggy address belongs to the object at ffff888056f73400 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff888056f73400, ffff888056f73600) The buggy address belongs to the physical page: page:ffffea00015bdc00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56f70 head:ffffea00015bdc00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888012041c80 raw: 0000000000000000 0000000000100010 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 0xd2a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3674, tgid 3674 (kworker/1:4), ts 42516748534, free_ts 10504999948 prep_new_page mm/page_alloc.c:2532 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4283 __alloc_pages+0x259/0x560 mm/page_alloc.c:5549 alloc_slab_page+0x70/0xf0 mm/slub.c:1829 allocate_slab+0x5e/0x520 mm/slub.c:1974 new_slab mm/slub.c:2034 [inline] ___slab_alloc+0x42e/0xce0 mm/slub.c:3036 __slab_alloc mm/slub.c:3123 [inline] slab_alloc_node mm/slub.c:3214 [inline] __kmalloc_node_track_caller+0x2c3/0x400 mm/slub.c:4964 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x11d/0x620 net/core/skbuff.c:509 alloc_skb include/linux/skbuff.h:1265 [inline] ndisc_alloc_skb+0xeb/0x2c0 net/ipv6/ndisc.c:421 ndisc_ns_create+0x22a/0x770 net/ipv6/ndisc.c:621 ndisc_send_ns+0xab/0x150 net/ipv6/ndisc.c:663 addrconf_dad_work+0xb3a/0x16e0 net/ipv6/addrconf.c:4171 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 arch/x86/entry/entry_64.S:306 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1449 [inline] free_pcp_prepare+0x812/0x900 mm/page_alloc.c:1499 free_unref_page_prepare mm/page_alloc.c:3380 [inline] free_unref_page+0x7d/0x630 mm/page_alloc.c:3476 free_contig_range+0xa3/0x160 mm/page_alloc.c:9457 destroy_args+0xfe/0x971 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x454/0x4ad mm/debug_vm_pgtable.c:1354 do_one_initcall+0xbd/0x2b0 init/main.c:1296 do_initcall_level+0x168/0x218 init/main.c:1369 do_initcalls+0x4b/0x8c init/main.c:1385 kernel_init_freeable+0x43a/0x5c3 init/main.c:1623 kernel_init+0x19/0x2b0 init/main.c:1512 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Memory state around the buggy address: ffff888056f73300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056f73380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888056f73400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888056f73480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888056f73500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================