mmc: rtsx_usb_sdmmc: fix return value check of mmc_add_host()

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: mmc: rtsx_usb_sdmmc: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, the memory that allocated in mmc_alloc_host() will be leaked and it will lead a kernel crash because of deleting not added device in the remove path. So fix this by checking the return value and calling mmc_free_host() in the error path, besides, led_classdev_unregister() and pm_runtime_disable() also need be called.

References

• https://git.kernel.org/stable/c/d7ad7278be401b09c9f9a9f522cf4c449c7fd489
• https://git.kernel.org/stable/c/e598c9683fe1cf97c2b11b800cc3cee072108220
• https://git.kernel.org/stable/c/89303ddbb502c3bc8edbf864f9f85500c8fe07e9
• https://git.kernel.org/stable/c/937112e991ed25d1727d878734adcbef3b900274
• https://git.kernel.org/stable/c/7fa922c7a3dd623fd59f1af50e8896fd9ca7f654
• https://git.kernel.org/stable/c/df683201c7ffbd21a806a7cad657b661c5ebfb6f
• https://git.kernel.org/stable/c/1491667d5450778a265eddddd294219acfd648cb
• https://git.kernel.org/stable/c/a522e26a20a43dcfbef9ee9f71ed803290e852b0
• https://git.kernel.org/stable/c/fc38a5a10e9e5a75eb9189854abeb8405b214cc9