x86: Fixed NULL function pointer dereference in AMD microcode patch loader.
Dereference took place in code part responsible for manual installation
of microcode patches through /dev/cpu/microcode.
Signed-off-by: Peter Oruba <peter.oruba@amd.com>
Cc: Peter Oruba <peter.oruba@amd.com>
Cc: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/microcode.c b/arch/x86/kernel/microcode.c
index 39961bb..ad136ad 100644
--- a/arch/x86/kernel/microcode.c
+++ b/arch/x86/kernel/microcode.c
@@ -127,7 +127,8 @@
old = current->cpus_allowed;
while ((cursor = microcode_ops->get_next_ucode(&new_mc, cursor)) > 0) {
- error = microcode_ops->microcode_sanity_check(new_mc);
+ if (microcode_ops->microcode_sanity_check != NULL)
+ error = microcode_ops->microcode_sanity_check(new_mc);
if (error)
goto out;
/*