net: atm: fix memory leak in atm_register_sysfs when device_register fail

net: atm: fix memory leak in atm_register_sysfs when device_register fail

[ Upstream commit 0a228624bcc00af41f281a2a84c928595a74c17d ]

When device_register() return error in atm_register_sysfs(), which can be
triggered by kzalloc fail in device_private_init() or other reasons,
kmemleak reports the following memory leaks:

unreferenced object 0xffff88810182fb80 (size 8):
  comm "insmod", pid 504, jiffies 4294852464
  hex dump (first 8 bytes):
    61 64 75 6d 6d 79 30 00                          adummy0.
  backtrace (crc 14dfadaf):
    __kmalloc_node_track_caller_noprof+0x335/0x450
    kvasprintf+0xb3/0x130
    kobject_set_name_vargs+0x45/0x120
    dev_set_name+0xa9/0xe0
    atm_register_sysfs+0xf3/0x220
    atm_dev_register+0x40b/0x780
    0xffffffffa000b089
    do_one_initcall+0x89/0x300
    do_init_module+0x27b/0x7d0
    load_module+0x54cd/0x5ff0
    init_module_from_file+0xe4/0x150
    idempotent_init_module+0x32c/0x610
    __x64_sys_finit_module+0xbd/0x120
    do_syscall_64+0xa8/0x270
    entry_SYSCALL_64_after_hwframe+0x77/0x7f

When device_create_file() return error in atm_register_sysfs(), the same
issue also can be triggered.

Function put_device() should be called to release kobj->name memory and
other device resource, instead of kfree().

Fixes: 1fa5ae857bb1 ("driver core: get rid of struct device's bus_id string array")
Signed-off-by: Wang Liang <wangliang74@huawei.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20250901063537.1472221-1-wangliang74@huawei.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>