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Commit 4ace2e7a authored by Borislav Petkov's avatar Borislav Petkov Committed by Thomas Gleixner
Browse files

x86/microcode/intel: Drop orig_sum from ext signature checksum 



It is 0 because for !0 values we would have exited already.

Signed-off-by: default avatarBorislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/1457345404-28884-6-git-send-email-bp@alien8.de


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 5b46b5e0

arch/x86/kernel/cpu/microcode/intel_lib.c

+3 −3
Original line number Diff line number Diff line
@@ -130,9 +130,9 @@ int microcode_sanity_check(void *mc, int print_err) 
	for (i = 0; i < ext_sigcount; i++) {

		ext_sig = (void *)ext_header + EXT_HEADER_SIZE +

			  EXT_SIGNATURE_SIZE * i;

		sum = orig_sum

			- (mc_header->sig + mc_header->pf + mc_header->cksum)

			+ (ext_sig->sig + ext_sig->pf + ext_sig->cksum);



		sum = (mc_header->sig + mc_header->pf + mc_header->cksum) -

		      (ext_sig->sig + ext_sig->pf + ext_sig->cksum);

		if (sum) {

			if (print_err)

				pr_err("Bad extended signature checksum, aborting.\n");