Bluetooth: hci4: unexpected cc 0x0c38 length: 249 > 2
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BUG: KASAN: double-free in kfree_skbmem+0x15c/0x1ec
Free of addr ffff0000ed136280 by task kworker/u9:7/6298

CPU: 1 PID: 6298 Comm: kworker/u9:7 Tainted: G        W          6.10.0-rc3-syzkaller-gac2193b4b460 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
Workqueue: hci1 hci_rx_work
Call trace:
 dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:317
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xe4/0x150 lib/dump_stack.c:114
 print_address_description mm/kasan/report.c:377 [inline]
 print_report+0x198/0x538 mm/kasan/report.c:488
 kasan_report_invalid_free+0xc4/0x118 mm/kasan/report.c:563
 poison_slab_object+0x140/0x180 mm/kasan/common.c:232
 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4437 [inline]
 kmem_cache_free+0x170/0x4d0 mm/slub.c:4512
 kfree_skbmem+0x15c/0x1ec
 __kfree_skb net/core/skbuff.c:1188 [inline]
 kfree_skb_reason+0x1c0/0x490 net/core/skbuff.c:1223
 kfree_skb include/linux/skbuff.h:1257 [inline]
 hci_req_sync_complete+0xb0/0x248 net/bluetooth/hci_request.c:109
 hci_event_packet+0xab8/0x105c net/bluetooth/hci_event.c:7479
 hci_rx_work+0x318/0xa78 net/bluetooth/hci_core.c:4074
 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:3393
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Allocated by task 6298:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:565
 unpoison_slab_object mm/kasan/common.c:312 [inline]
 __kasan_slab_alloc+0x74/0x8c 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+0x1c0/0x350 mm/slub.c:4008
 skb_clone+0x1c8/0x330 net/core/skbuff.c:2052
 hci_send_cmd_sync net/bluetooth/hci_core.c:4123 [inline]
 hci_cmd_work+0x174/0x568 net/bluetooth/hci_core.c:4143
 process_one_work+0x79c/0x15b8 kernel/workqueue.c:3231
 process_scheduled_works kernel/workqueue.c:3312 [inline]
 worker_thread+0x938/0xef4 kernel/workqueue.c:3393
 kthread+0x288/0x310 kernel/kthread.c:389
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860

Freed by task 6286:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x40/0x78 mm/kasan/common.c:68
 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:579
 poison_slab_object+0x128/0x180 mm/kasan/common.c:240
 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256
 kasan_slab_free include/linux/kasan.h:184 [inline]
 slab_free_hook mm/slub.c:2196 [inline]
 slab_free mm/slub.c:4437 [inline]
 kmem_cache_free+0x170/0x4d0 mm/slub.c:4512
 kfree_skbmem+0x15c/0x1ec
 __kfree_skb net/core/skbuff.c:1188 [inline]
 kfree_skb_reason+0x1c0/0x490 net/core/skbuff.c:1223
 kfree_skb include/linux/skbuff.h:1257 [inline]
 __hci_req_sync+0x4e8/0x798 net/bluetooth/hci_request.c:184
 hci_req_sync+0xa0/0xcc net/bluetooth/hci_request.c:206
 hci_dev_cmd+0x304/0x8c0 net/bluetooth/hci_core.c:787
 hci_sock_ioctl+0x4b8/0x7e4 net/bluetooth/hci_sock.c:1150
 sock_do_ioctl+0x134/0x2d0 net/socket.c:1222
 sock_ioctl+0x4ec/0x838 net/socket.c:1341
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:907 [inline]
 __se_sys_ioctl fs/ioctl.c:893 [inline]
 __arm64_sys_ioctl+0x14c/0x1c8 fs/ioctl.c:893
 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline]
 invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48
 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133
 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152
 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712
 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730
 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598

The buggy address belongs to the object at ffff0000ed136280
 which belongs to the cache skbuff_head_cache of size 240
The buggy address is located 0 bytes inside of
 240-byte region [ffff0000ed136280, ffff0000ed136370)

The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d136
flags: 0x5ffc00000000000(node=0|zone=2|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 05ffc00000000000 ffff0000c1bcc780 dead000000000122 0000000000000000
raw: 0000000000000000 00000000000c000c 00000001ffffefff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ed136180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff0000ed136200: 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc
>ffff0000ed136280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff0000ed136300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
 ffff0000ed136380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
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