class: fix possible memory leak in __class_register()

In the Linux kernel, the following vulnerability has been resolved:

class: fix possible memory leak in __class_register()

If class_add_groups() returns error, the 'cp->subsys' need be

unregister, and the 'cp' need be freed.

We can not call kset_unregister() here, because the 'cls' will

be freed in callback function class_release() and it's also

freed in caller's error path, it will cause double free.

So fix this by calling kobject_del() and kfree_const(name) to

cleanup kobject. Besides, call kfree() to free the 'cp'.

Fault injection test can trigger this:

unreferenced object 0xffff888102fa8190 (size 8):

comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s)

hex dump (first 8 bytes):

70 6b 74 63 64 76 64 00 pktcdvd.

backtrace:

[<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320

[<000000005e4d70bc>] kstrdup+0x3a/0x70

[<00000000c2e5e85a>] kstrdup_const+0x68/0x80

[<000000000049a8c7>] kvasprintf_const+0x10b/0x190

[<0000000029123163>] kobject_set_name_vargs+0x56/0x150

[<00000000747219c9>] kobject_set_name+0xab/0xe0

[<0000000005f1ea4e>] __class_register+0x15c/0x49a

unreferenced object 0xffff888037274000 (size 1024):

comm "modprobe", pid 502, jiffies 4294906074 (age 49.296s)

hex dump (first 32 bytes):

00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff .@'7.....@'7....

00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N..........

backtrace:

[<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0

[<00000000ecf3dd95>] __class_register+0x86/0x49a