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BUG: KMSAN: uninit-value in vsscanf+0x3dd4/0x4410 lib/vsprintf.c:3639
 vsscanf+0x3dd4/0x4410 lib/vsprintf.c:3639
 sscanf+0x206/0x250 lib/vsprintf.c:3692
 get_l2cap_conn+0x1d6/0x760 net/bluetooth/6lowpan.c:960
 lowpan_control_write+0x31d/0xf70 net/bluetooth/6lowpan.c:1100
 full_proxy_write+0x2c2/0x440 fs/debugfs/file.c:236
 vfs_write+0x8ce/0x2030 fs/read_write.c:588
 ksys_write+0x28b/0x510 fs/read_write.c:643
 __do_sys_write fs/read_write.c:655 [inline]
 __se_sys_write fs/read_write.c:652 [inline]
 __x64_sys_write+0xdb/0x120 fs/read_write.c:652
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable vmf.i created at:
 __handle_mm_fault mm/memory.c:4624 [inline]
 handle_mm_fault+0x585/0x4750 mm/memory.c:4805
 do_user_addr_fault+0x126c/0x1f20 arch/x86/mm/fault.c:1417

CPU: 0 PID: 25659 Comm: syz-executor.0 Not tainted 5.17.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
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