mailbox: zynq-ipi: fix error handling while device_register() fails

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: zynq-ipi: fix error handling while device_register() fails If device_register() fails, it has two issues: 1. The name allocated by dev_set_name() is leaked. 2. The parent of device is not NULL, device_unregister() is called in zynqmp_ipi_free_mboxes(), it will lead a kernel crash because of removing not added device. Call put_device() to give up the reference, so the name is freed in kobject_cleanup(). Add device registered check in zynqmp_ipi_free_mboxes() to avoid null-ptr-deref.

References

• https://git.kernel.org/stable/c/b3a5c76f61e2b380e29dfc6705854ca1ee85501d
• https://git.kernel.org/stable/c/a39b4de0804f9fe0ae911b359ffd4afe7d9d933b
• https://git.kernel.org/stable/c/4f05d8e2fb3ab702c2633a74571e1b31cb579985
• https://git.kernel.org/stable/c/f2d63cefc012cafe1b7651bbf3302f8bcd8bea4a
• https://git.kernel.org/stable/c/3fcf079958c00d83c51e4f250abf2c77fe9cc1b9
• https://git.kernel.org/stable/c/a6792a0cdef0b1c2d77920246283a72537e60e94