================================================================== BUG: KASAN: use-after-free in hci_cmd_timeout+0x1c3/0x1f0 net/bluetooth/hci_core.c:1495 Read of size 2 at addr ffff88807d6b4808 by task kworker/u5:6/3659 CPU: 0 PID: 3659 Comm: kworker/u5:6 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022 Workqueue: hci9 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 3661: 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 The buggy address belongs to the object at ffff88807d6b4800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 8 bytes inside of 512-byte region [ffff88807d6b4800, ffff88807d6b4a00) The buggy address belongs to the physical page: page:ffffea0001f5ad00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7d6b4 head:ffffea0001f5ad00 order:2 compound_mapcount:0 compound_pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 0000000000000000 dead000000000001 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 0xd28c0(GFP_NOWAIT|__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3644, tgid 3644 (syz-executor.3), ts 170691134924, free_ts 170090926998 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] pskb_expand_head+0x18c/0x1280 net/core/skbuff.c:1832 netlink_trim+0x17f/0x210 net/netlink/af_netlink.c:1301 netlink_broadcast+0x64/0x1170 net/netlink/af_netlink.c:1497 nlmsg_multicast include/net/netlink.h:1044 [inline] nlmsg_notify+0xfa/0x1c0 net/netlink/af_netlink.c:2583 rtmsg_fib+0x38b/0x610 net/ipv4/fib_semantics.c:539 fib_table_insert+0xf9d/0x1f20 net/ipv4/fib_trie.c:1402 fib_magic+0x451/0x650 net/ipv4/fib_frontend.c:1098 fib_add_ifaddr+0x143/0x5c0 net/ipv4/fib_frontend.c:1120 fib_inetaddr_event+0x12b/0x2e0 net/ipv4/fib_frontend.c:1434 notifier_call_chain kernel/notifier.c:87 [inline] blocking_notifier_call_chain+0x108/0x1b0 kernel/notifier.c:382 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_slab mm/slub.c:2073 [inline] discard_slab mm/slub.c:2079 [inline] __unfreeze_partials+0x1ab/0x200 mm/slub.c:2553 put_cpu_partial+0x116/0x180 mm/slub.c:2629 qlist_free_all+0x2b/0x70 mm/kasan/quarantine.c:187 kasan_quarantine_reduce+0x169/0x180 mm/kasan/quarantine.c:294 __kasan_slab_alloc+0x2f/0xe0 mm/kasan/common.c:447 kasan_slab_alloc include/linux/kasan.h:224 [inline] slab_post_alloc_hook mm/slab.h:727 [inline] slab_alloc_node mm/slub.c:3248 [inline] slab_alloc mm/slub.c:3256 [inline] __kmem_cache_alloc_lru mm/slub.c:3263 [inline] kmem_cache_alloc+0x1a6/0x310 mm/slub.c:3273 anon_vma_chain_alloc mm/rmap.c:141 [inline] __anon_vma_prepare+0x64/0x3f0 mm/rmap.c:195 anon_vma_prepare include/linux/rmap.h:159 [inline] do_cow_fault+0x3ac/0x5d0 mm/memory.c:4540 do_fault mm/memory.c:4655 [inline] handle_pte_fault mm/memory.c:4917 [inline] __handle_mm_fault mm/memory.c:5059 [inline] handle_mm_fault+0x1bbd/0x35c0 mm/memory.c:5157 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1407 handle_page_fault arch/x86/mm/fault.c:1498 [inline] exc_page_fault+0x7a/0x120 arch/x86/mm/fault.c:1554 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 Memory state around the buggy address: ffff88807d6b4700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88807d6b4780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88807d6b4800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88807d6b4880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88807d6b4900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================