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BUG: KASAN: slab-use-after-free in hci_cmd_timeout+0x1d9/0x1e0 net/bluetooth/hci_core.c:1522
Read of size 2 at addr ffff888028682538 by task kworker/u9:5/5122

CPU: 0 PID: 5122 Comm: kworker/u9:5 Not tainted 6.10.0-rc4-syzkaller-00301-g5f583a3162ff #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: hci0 hci_cmd_timeout
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x169/0x550 mm/kasan/report.c:488
 kasan_report+0x143/0x180 mm/kasan/report.c:601
 hci_cmd_timeout+0x1d9/0x1e0 net/bluetooth/hci_core.c:1522
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>

Allocated by task 5122:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x66/0x80 mm/kasan/common.c:338
 kasan_slab_alloc include/linux/kasan.h:201 [inline]
 slab_post_alloc_hook mm/slub.c:3941 [inline]
 slab_alloc_node mm/slub.c:4001 [inline]
 kmem_cache_alloc_noprof+0x135/0x2a0 mm/slub.c:4008
 skb_clone+0x20c/0x390 net/core/skbuff.c:2052
 hci_send_cmd_sync net/bluetooth/hci_core.c:4123 [inline]
 hci_cmd_work+0x29e/0x670 net/bluetooth/hci_core.c:4143
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0xa2e/0x1830 kernel/workqueue.c:3312
 worker_thread+0x86d/0xd70 kernel/workqueue.c:3393
 kthread+0x2f2/0x390 kernel/kthread.c:389
 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

The buggy address belongs to the object at ffff888028682500
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 56 bytes inside of
 freed 240-byte region [ffff888028682500, ffff8880286825f0)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28682
memcg:ffff88802e523e01
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 00fff00000000000 ffff888018adb780 ffffea0001ed7100 dead000000000002
raw: 0000000000000000 00000000000c000c 00000001ffffefff ffff88802e523e01
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 1, tgid 1 (swapper/0), ts 17268937372, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1f3/0x230 mm/page_alloc.c:1468
 prep_new_page mm/page_alloc.c:1476 [inline]
 get_page_from_freelist+0x2e43/0x2f00 mm/page_alloc.c:3420
 __alloc_pages_noprof+0x256/0x6c0 mm/page_alloc.c:4678
 __alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
 alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
 alloc_slab_page+0x5f/0x120 mm/slub.c:2265
 allocate_slab+0x5a/0x2f0 mm/slub.c:2428
 new_slab mm/slub.c:2481 [inline]
 ___slab_alloc+0xcd1/0x14b0 mm/slub.c:3667
 __kmem_cache_alloc_bulk mm/slub.c:4723 [inline]
 kmem_cache_alloc_bulk_noprof+0x202/0x770 mm/slub.c:4795
 napi_skb_cache_get+0x166/0x230 net/core/skbuff.c:346
 __napi_build_skb net/core/skbuff.c:525 [inline]
 napi_alloc_skb+0x1fd/0x530 net/core/skbuff.c:843
 napi_get_frags+0x6a/0x150 net/core/gro.c:680
 napi_get_frags_check+0x39/0x90 net/core/skbuff.c:300
 netif_napi_add_weight+0x898/0xc30 net/core/dev.c:6619
 netif_napi_add include/linux/netdevice.h:2638 [inline]
 gro_cells_init+0x192/0x200 net/core/gro_cells.c:85
 ip6_tnl_dev_init_gen net/ipv6/ip6_tunnel.c:1881 [inline]
 ip6_tnl_dev_init+0xc8/0x7c0 net/ipv6/ip6_tunnel.c:1915
 register_netdevice+0x604/0x19e0 net/core/dev.c:10302
 register_netdev+0x3b/0x50 net/core/dev.c:10512
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888028682400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888028682480: fb fb fb fb fb fb fc fc fc fc fc fc fc fc fc fc
>ffff888028682500: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff888028682580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff888028682600: fc fc fc fc fc fc fc fc 00 00 00 00 00 00 00 00
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