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

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: mmc: omap_hsmmc: fix return value check of mmc_add_host() mmc_add_host() may return error, if we ignore its return value, it will lead two issues: 1. The memory that allocated in mmc_alloc_host() is leaked. 2. In the remove() path, mmc_remove_host() will be called to delete device, but it's not added yet, it will lead a kernel crash because of null-ptr-deref in device_del(). Fix this by checking the return value and goto error path wihch will call mmc_free_host().

References

• https://git.kernel.org/stable/c/f153c9e15f8961bdf38707853e15b42ea7c691d9
• https://git.kernel.org/stable/c/fb3d596267a98813a7a8206097d8d46c98505a0d
• https://git.kernel.org/stable/c/62005dfcc396424db3337a1dc3ab49623537f5e5
• https://git.kernel.org/stable/c/a5f8a4583280a76e50329b910e91ef1dea1e6c79
• https://git.kernel.org/stable/c/4e1dc24bcfc8257f24c0663badec7e4f3ae80558
• https://git.kernel.org/stable/c/a525cad241c339ca00bf7ebf03c5180f2a9b767c