staging: rtl8712: fix a potential memory leak in r871xu_drv_init()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8712: fix a potential memory leak in r871xu_drv_init() In r871xu_drv_init(), if r8712_init_drv_sw() fails, then the memory allocated by r8712_alloc_io_queue() in r8712_usb_dvobj_init() is not properly released as there is no action will be performed by r8712_usb_dvobj_deinit(). To properly release it, we should call r8712_free_io_queue() in r8712_usb_dvobj_deinit(). Besides, in r871xu_dev_remove(), r8712_usb_dvobj_deinit() will be called by r871x_dev_unload() under condition `padapter->bup` and r8712_free_io_queue() is called by r8712_free_drv_sw(). However, r8712_usb_dvobj_deinit() does not rely on `padapter->bup` and calling r8712_free_io_queue() in r8712_free_drv_sw() is negative for better understading the code. So I move r8712_usb_dvobj_deinit() into r871xu_dev_remove(), and remove r8712_free_io_queue() from r8712_free_drv_sw().

References

• https://git.kernel.org/stable/c/5a89a92efc342dd7c44b6056da87debc598f9c73
• https://git.kernel.org/stable/c/8eb42d6d10f8fe509117859defddf9e72b4fa4d0
• https://git.kernel.org/stable/c/205e039fead72e87ad2838f5e649a4c4834f648b
• https://git.kernel.org/stable/c/a2882b8baad068d21c99fb2ab5a85a2bdbd5b834
• https://git.kernel.org/stable/c/7288ff561de650d4139fab80e9cb0da9b5b32434