[PATCH 4.1 13/86] powerpc/rtas: Validate rtas.entry before calling enter_rtas()

4.1-stable review patch. If anyone has any objections, please let me know. -- From: Vasant Hegde commit 8832317f662c06f5c06e638f57bfe89a71c9b266 upstream. Currently we do not validate rtas.entry before calling enter_rtas(). This leads to a kernel oops when user space calls

[PATCH 4.1 13/86] powerpc/rtas: Validate rtas.entry before calling enter_rtas()

4.1-stable review patch. If anyone has any objections, please let me know. -- From: Vasant Hegde commit 8832317f662c06f5c06e638f57bfe89a71c9b266 upstream. Currently we do not validate rtas.entry before calling enter_rtas(). This leads to a