x86/microcode/intel: Handle truncated microcode images more robustly

[pandora-kernel.git] / arch / x86 / kernel / cpu / microcode / intel.c

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index c6826d1..746e7fd 100644 (file)
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -196,6 +196,11 @@ static enum ucode_state generic_load_microcode(int cpu, void *data, size_t size,
                struct microcode_header_intel mc_header;
                unsigned int mc_size;
 
+               if (leftover < sizeof(mc_header)) {
+                       pr_err("error! Truncated header in microcode data file\n");
+                       break;
+               }
+
                if (get_ucode_data(&mc_header, ucode_ptr, sizeof(mc_header)))
                        break;