firmware: dmi-sysfs: Fix null-ptr-deref in dmi_sysfs_register_handle

firmware: dmi-sysfs: Fix null-ptr-deref in dmi_sysfs_register_handle

[ Upstream commit 18e126e97c961f7a93823795c879d7c085fe5098 ]

KASAN reported a null-ptr-deref error:

KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 PID: 1373 Comm: modprobe
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
RIP: 0010:dmi_sysfs_entry_release
...
Call Trace:
 <TASK>
 kobject_put
 dmi_sysfs_register_handle (drivers/firmware/dmi-sysfs.c:540) dmi_sysfs
 dmi_decode_table (drivers/firmware/dmi_scan.c:133)
 dmi_walk (drivers/firmware/dmi_scan.c:1115)
 dmi_sysfs_init (drivers/firmware/dmi-sysfs.c:149) dmi_sysfs
 do_one_initcall (init/main.c:1296)
 ...
Kernel panic - not syncing: Fatal exception
Kernel Offset: 0x4000000 from 0xffffffff81000000
---[ end Kernel panic - not syncing: Fatal exception ]---

It is because previous patch added kobject_put() to release the memory
which will call  dmi_sysfs_entry_release() and list_del().

However, list_add_tail(entry->list) is called after the error block,
so the list_head is uninitialized and cannot be deleted.

Move error handling to after list_add_tail to fix this.

Fixes: 660ba678f999 ("firmware: dmi-sysfs: Fix memory leak in dmi_sysfs_register_handle")
Signed-off-by: Chen Zhongjin <chenzhongjin@huawei.com>
Link: https://lore.kernel.org/r/20221111015326.251650-2-chenzhongjin@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>