x86, microcode, AMD: Correct buf references

Both the equivalence table and the microcode patch types are u32. Access
them properly through the buf-ptr.

Signed-off-by: Borislav Petkov <borislav.petkov@amd.com>

diff --git a/arch/x86/kernel/microcode_amd.c b/arch/x86/kernel/microcode_amd.c
index c5610384ab167c162f33abbb6da8401b5cbba45d..d30d67cd33ad25983808be10202b25abca2745c7 100644 (file)
--- a/arch/x86/kernel/microcode_amd.c
+++ b/arch/x86/kernel/microcode_amd.c
@@ -157,7 +157,7 @@ static int apply_microcode_amd(int cpu)
 static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size)
 {
        struct cpuinfo_x86 *c = &cpu_data(cpu);
-       unsigned int max_size, actual_size;
+       u32 max_size, actual_size;
 
 #define F1XH_MPB_MAX_SIZE 2048
 #define F14H_MPB_MAX_SIZE 1824
@@ -175,7 +175,7 @@ static unsigned int verify_ucode_size(int cpu, const u8 *buf, unsigned int size)
                break;
        }
 
-       actual_size = buf[4] + (buf[5] << 8);
+       actual_size = *(u32 *)(buf + 4);
 
        if (actual_size > size || actual_size > max_size) {
                pr_err("section size mismatch\n");
@@ -191,7 +191,7 @@ get_next_ucode(int cpu, const u8 *buf, unsigned int size, unsigned int *mc_size)
        struct microcode_header_amd *mc = NULL;
        unsigned int actual_size = 0;
 
-       if (buf[0] != UCODE_UCODE_TYPE) {
+       if (*(u32 *)buf != UCODE_UCODE_TYPE) {
                pr_err("invalid type field in container file section header\n");
                goto out;
        }