x86/microcode/intel: Check scan_microcode()'s retval

... and do not attempt to load anything in case of error.

Signed-off-by: Borislav Petkov <bp@suse.de>

diff --git a/arch/x86/kernel/cpu/microcode/intel_early.c b/arch/x86/kernel/cpu/microcode/intel_early.c
index 7bcad1a..88a0348 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/intel_early.c
+++ b/arch/x86/kernel/cpu/microcode/intel_early.c
@@ -514,9 +514,9 @@ EXPORT_SYMBOL_GPL(save_mc_for_early);
 
 static __initdata char ucode_name[] = "kernel/x86/microcode/GenuineIntel.bin";
 static __init enum ucode_state
-scan_microcode(unsigned long start, unsigned long size,
-              struct mc_saved_data *mc_saved_data,
-              unsigned long *mc_saved_in_initrd, struct ucode_cpu_info *uci)
+scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
+              unsigned long start, unsigned long size,
+              struct ucode_cpu_info *uci)
 {
        struct cpio_data cd;
        long offset = 0;
@@ -534,8 +534,7 @@ scan_microcode(unsigned long start, unsigned long size,
                return UCODE_ERROR;
 
        return get_matching_model_microcode(0, start, cd.data, cd.size,
-                                           mc_saved_data, mc_saved_in_initrd,
-                                           uci);
+                                           mc_saved_data, initrd, uci);
 }
 
 /*
@@ -679,16 +678,19 @@ int __init save_microcode_in_initrd_intel(void)
 
 static void __init
 _load_ucode_intel_bsp(struct mc_saved_data *mc_saved_data,
-                     unsigned long *mc_saved_in_initrd,
+                     unsigned long *initrd,
                      unsigned long start, unsigned long size)
 {
        struct ucode_cpu_info uci;
        enum ucode_state ret;
 
        collect_cpu_info_early(&uci);
-       scan_microcode(start, size, mc_saved_data, mc_saved_in_initrd, &uci);
 
-       ret = load_microcode(mc_saved_data, mc_saved_in_initrd, start, &uci);
+       ret = scan_microcode(mc_saved_data, initrd, start, size, &uci);
+       if (ret != UCODE_OK)
+               return;
+
+       ret = load_microcode(mc_saved_data, initrd, start, &uci);
        if (ret != UCODE_OK)
                return;