[v6.1] KFENCE: invalid free in __hci_req_sync

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 909ba1f1b414 Linux 6.1.90
git tree: linux-6.1.y
console output: https://syzkaller.appspot.com/x/log.txt?x=1658d884980000
kernel config: https://syzkaller.appspot.com/x/.config?x=3be6d6f79b879a67
dashboard link: https://syzkaller.appspot.com/bug?extid=fc354d92b934fe7548f1
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/63178de7cba7/disk-909ba1f1.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/25dec90d8126/vmlinux-909ba1f1.xz
kernel image: https://storage.googleapis.com/syzbot-assets/25509ea1c6cd/bzImage-909ba1f1.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+fc354d...@syzkaller.appspotmail.com

==================================================================
BUG: KFENCE: invalid free in kfree_skb include/linux/skbuff.h:1220 [inline]
BUG: KFENCE: invalid free in __hci_req_sync+0x626/0x940 net/bluetooth/hci_request.c:184

Invalid free of 0xffff88823bdac000 (in kfence-#213):
kfree_skb include/linux/skbuff.h:1220 [inline]
__hci_req_sync+0x626/0x940 net/bluetooth/hci_request.c:184
hci_req_sync+0xa5/0xc0 net/bluetooth/hci_request.c:206
hci_dev_cmd+0x2fc/0xa30 net/bluetooth/hci_core.c:790
sock_do_ioctl+0x152/0x450 net/socket.c:1204
sock_ioctl+0x47f/0x770 net/socket.c:1321
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2

kfence-#213: 0xffff88823bdac000-0xffff88823bdac0ef, size=240, cache=skbuff_head_cache

allocated by task 3570 on cpu 1 at 339.858362s:
skb_clone+0x1e5/0x360 net/core/skbuff.c:1660
hci_send_cmd_sync net/bluetooth/hci_core.c:4179 [inline]
hci_cmd_work+0x296/0x660 net/bluetooth/hci_core.c:4199
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

freed by task 3570 on cpu 1 at 339.861251s:
kfree_skb include/linux/skbuff.h:1220 [inline]
hci_req_sync_complete+0xee/0x280 net/bluetooth/hci_request.c:109
hci_event_packet+0xc49/0x1510 net/bluetooth/hci_event.c:7601
hci_rx_work+0x3cd/0xce0 net/bluetooth/hci_core.c:4130
process_one_work+0x8a9/0x11d0 kernel/workqueue.c:2292
worker_thread+0xa47/0x1200 kernel/workqueue.c:2439
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308

CPU: 0 PID: 8892 Comm: syz-executor.0 Not tainted 6.1.90-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/02/2024
==================================================================


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