==================================================================
BUG: KASAN: use-after-free in hci_cmd_timeout+0x24b/0x250 net/bluetooth/hci_core.c:1495
Read of size 2 at addr ffff888020505008 by task kworker/u5:2/3654

CPU: 0 PID: 3654 Comm: kworker/u5:2 Not tainted 6.0.0-rc6-next-20220923-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: hci6 hci_cmd_timeout
Call Trace:
 <TASK>
 __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
 </TASK>

Allocated by task 3664:
 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:934 [inline]
 __kmalloc_node_track_caller+0x55/0xc0 mm/slab_common.c:954
 kmalloc_reserve net/core/skbuff.c:362 [inline]
 __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434
 alloc_skb include/linux/skbuff.h:1258 [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+0x177b/0x2190 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 3664:
 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:1669 [inline]
 slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1695
 slab_free mm/slub.c:3599 [inline]
 __kmem_cache_free+0xab/0x3b0 mm/slub.c:3612
 skb_free_head+0xac/0x110 net/core/skbuff.c:662
 skb_release_data+0x5f1/0x870 net/core/skbuff.c:691
 skb_release_all net/core/skbuff.c:756 [inline]
 __kfree_skb net/core/skbuff.c:770 [inline]
 kfree_skb_reason+0x186/0x4b0 net/core/skbuff.c:793
 kfree_skb include/linux/skbuff.h:1207 [inline]
 hci_dev_open_sync+0xbe2/0x2190 net/bluetooth/hci_sync.c:4698
 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

The buggy address belongs to the object at ffff888020505000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 8 bytes inside of
 512-byte region [ffff888020505000, ffff888020505200)

The buggy address belongs to the physical page:
page:ffffea0000814100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffffea0000779620 pfn:0x20504
head:ffffea0000814100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888011841c80 dead00000010000e ffff888020507400
raw: ffffea0000779620 ffffea0001f2eb20 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3606, tgid 3600 (syz-fuzzer), ts 75111283915, free_ts 42834108841
 prep_new_page mm/page_alloc.c:2538 [inline]
 get_page_from_freelist+0x1092/0x2d20 mm/page_alloc.c:4287
 __alloc_pages+0x1c7/0x5a0 mm/page_alloc.c:5546
 alloc_pages+0x1a6/0x270 mm/mempolicy.c:2280
 alloc_slab_page mm/slub.c:1739 [inline]
 allocate_slab+0x213/0x300 mm/slub.c:1884
 new_slab mm/slub.c:1937 [inline]
 ___slab_alloc+0xac1/0x1430 mm/slub.c:3119
 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3217
 slab_alloc_node mm/slub.c:3302 [inline]
 __kmem_cache_alloc_node+0x18a/0x3d0 mm/slub.c:3375
 __do_kmalloc_node mm/slab_common.c:933 [inline]
 __kmalloc_node_track_caller+0x45/0xc0 mm/slab_common.c:954
 kmalloc_reserve net/core/skbuff.c:362 [inline]
 __alloc_skb+0xd9/0x2f0 net/core/skbuff.c:434
 __napi_alloc_skb+0x93/0x340 net/core/skbuff.c:575
 napi_alloc_skb include/linux/skbuff.h:3208 [inline]
 page_to_skb+0x17d/0xc80 drivers/net/virtio_net.c:496
 receive_mergeable drivers/net/virtio_net.c:1119 [inline]
 receive_buf+0xe0a/0x5560 drivers/net/virtio_net.c:1258
 virtnet_receive drivers/net/virtio_net.c:1553 [inline]
 virtnet_poll+0x708/0x1310 drivers/net/virtio_net.c:1671
 __napi_poll+0xb8/0x770 net/core/dev.c:6511
 napi_poll net/core/dev.c:6578 [inline]
 net_rx_action+0x9fc/0xde0 net/core/dev.c:6689
 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571
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
 __folio_put_large mm/swap.c:118 [inline]
 __folio_put+0x105/0x130 mm/swap.c:126
 folio_put include/linux/mm.h:1159 [inline]
 put_page include/linux/mm.h:1211 [inline]
 __skb_frag_unref include/linux/skbuff.h:3381 [inline]
 skb_release_data+0x51e/0x870 net/core/skbuff.c:685
 skb_release_all net/core/skbuff.c:756 [inline]
 napi_consume_skb net/core/skbuff.c:1013 [inline]
 napi_consume_skb+0x145/0x280 net/core/skbuff.c:991
 skb_defer_free_flush net/core/dev.c:6659 [inline]
 net_rx_action+0x342/0xde0 net/core/dev.c:6680
 __do_softirq+0x1f7/0xad8 kernel/softirq.c:571

Memory state around the buggy address:
 ffff888020504f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888020504f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888020505000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff888020505080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888020505100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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