[PATCH 5/5] x86/microcode/intel: Drop orig_sum from ext signature checksum

[Borislav Petkov]

From: Borislav Petkov <b...@suse.de>

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

Signed-off-by: Borislav Petkov <b...@suse.de>
---
 arch/x86/kernel/cpu/microcode/intel_lib.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/intel_lib.c 
b/arch/x86/kernel/cpu/microcode/intel_lib.c
index 23b1d92342e3..2ce1a7dc45b7 100644
--- a/arch/x86/kernel/cpu/microcode/intel_lib.c
+++ b/arch/x86/kernel/cpu/microcode/intel_lib.c
@@ -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");
-- 
2.3.5