Protect against integer overflows caused by malformed fdt headers. CRs-Fixed: 749977 Change-Id: I51d87038f520bc761b163d291b0138c513c69a33 Signed-off-by: Vijay Kumar Pendoti <vpendo@codeaurora.org> Signed-off-by: Rishabh Bhatnagar <rishabhb@codeaurora.org>