================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1495 Read of size 2 at addr ffff88808551f008 by task kworker/u5:4/28618 CPU: 0 PID: 28618 Comm: kworker/u5:4 Not tainted 6.1.0-rc2-syzkaller-00105-gb229b6ca5abb #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+0x1e3/0x2cb lib/dump_stack.c:106 print_address_description+0x74/0x340 mm/kasan/report.c:284 print_report+0x107/0x220 mm/kasan/report.c:395 kasan_report+0x139/0x170 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 3663: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:371 [inline] __kasan_kmalloc+0x97/0xb0 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+0xad/0x1a0 mm/slab_common.c:975 kmalloc_reserve net/core/skbuff.c:437 [inline] __alloc_skb+0x11d/0x620 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+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 3663: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x70 mm/kasan/common.c:52 kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:511 ____kasan_slab_free+0xd6/0x120 mm/kasan/common.c:236 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x12e/0x1a0 mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x71/0x110 mm/slub.c:3674 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:1216 [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:45 __kasan_record_aux_stack+0xb0/0xc0 mm/kasan/generic.c:481 insert_work+0x54/0x3e0 kernel/workqueue.c:1358 __queue_work+0xaaa/0xd60 kernel/workqueue.c:1517 call_timer_fn+0xf5/0x210 kernel/time/timer.c:1474 expire_timers kernel/time/timer.c:1514 [inline] __run_timers+0x7a2/0x980 kernel/time/timer.c:1790 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1803 __do_softirq+0x277/0x75b kernel/softirq.c:571 The buggy address belongs to the object at ffff88808551f000 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88808551f000, ffff88808551f200) The buggy address belongs to the physical page: page:ffffea0002154700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x8551c head:ffffea0002154700 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 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 3746, tgid 3746 (syz-executor.1), ts 223679421701, free_ts 219270076377 prep_new_page mm/page_alloc.c:2538 [inline] get_page_from_freelist+0x72b/0x7a0 mm/page_alloc.c:4287 __alloc_pages+0x259/0x560 mm/page_alloc.c:5554 alloc_slab_page+0x70/0xf0 mm/slub.c:1794 allocate_slab+0x5e/0x4b0 mm/slub.c:1939 new_slab mm/slub.c:1992 [inline] ___slab_alloc+0x7f4/0xeb0 mm/slub.c:3180 __slab_alloc mm/slub.c:3279 [inline] slab_alloc_node mm/slub.c:3364 [inline] __kmem_cache_alloc_node+0x252/0x310 mm/slub.c:3437 kmalloc_trace+0x26/0x60 mm/slab_common.c:1046 kmalloc include/linux/slab.h:576 [inline] kzalloc include/linux/slab.h:712 [inline] mca_alloc net/ipv6/mcast.c:880 [inline] __ipv6_dev_mc_inc+0x454/0xbc0 net/ipv6/mcast.c:936 ipv6_add_dev+0xc9c/0x1150 net/ipv6/addrconf.c:465 addrconf_notify+0x75b/0xfe0 net/ipv6/addrconf.c:3528 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:455 call_netdevice_notifiers_info net/core/dev.c:1945 [inline] call_netdevice_notifiers_extack net/core/dev.c:1983 [inline] call_netdevice_notifiers+0x14e/0x1d0 net/core/dev.c:1997 register_netdevice+0x15d5/0x1a20 net/core/dev.c:10090 veth_newlink+0x875/0xd10 drivers/net/veth.c:1795 rtnl_newlink_create net/core/rtnetlink.c:3364 [inline] __rtnl_newlink net/core/rtnetlink.c:3581 [inline] rtnl_newlink+0x14ed/0x2060 net/core/rtnetlink.c:3594 rtnetlink_rcv_msg+0x7b8/0xe90 net/core/rtnetlink.c:6091 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+0x80c/0x8f0 mm/page_alloc.c:1508 free_unref_page_prepare mm/page_alloc.c:3386 [inline] free_unref_page_list+0xb4/0x7b0 mm/page_alloc.c:3528 release_pages+0x233a/0x25d0 mm/swap.c:1055 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:256 [inline] tlb_flush_mmu+0x850/0xa70 mm/mmu_gather.c:263 tlb_finish_mmu+0xcb/0x200 mm/mmu_gather.c:363 zap_page_range+0x65a/0x720 mm/memory.c:1765 madvise_dontneed_single_vma mm/madvise.c:793 [inline] madvise_dontneed_free+0x663/0x1540 mm/madvise.c:876 madvise_vma_behavior mm/madvise.c:1015 [inline] madvise_walk_vmas mm/madvise.c:1240 [inline] do_madvise+0x7d3/0x2000 mm/madvise.c:1419 __do_sys_madvise mm/madvise.c:1432 [inline] __se_sys_madvise mm/madvise.c:1430 [inline] __x64_sys_madvise+0xa2/0xb0 mm/madvise.c:1430 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 Memory state around the buggy address: ffff88808551ef00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88808551ef80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88808551f000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88808551f080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88808551f100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================