diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index 07b5fc00b188..b44c9029860c 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -461,8 +461,12 @@ static int collect_cpu_info_amd(int cpu, struct cpu_signature *csig)
 	return 0;
 }
 
-static unsigned int verify_patch_size(u8 family, u32 patch_size,
-				      unsigned int size)
+/*
+ * Check whether the passed remaining file @size is large enough to contain a
+ * patch of the indicated @patch_size (and also whether this size does not
+ * exceed the per-family maximum).
+ */
+static unsigned int verify_patch_size(u8 family, u32 patch_size, unsigned int size)
 {
 	u32 max_size;
 
@@ -621,7 +625,12 @@ static int verify_and_add_patch(u8 family, u8 *fw, unsigned int leftover)
 		return crnt_size;
 	}
 
-	ret = verify_patch_size(family, patch_size, leftover);
+	/*
+	 * The section header length is not included in this indicated size
+	 * but is present in the leftover file length so we need to subtract
+	 * it before passing this value to the function below.
+	 */
+	ret = verify_patch_size(family, patch_size, leftover - SECTION_HDR_SIZE);
 	if (!ret) {
 		pr_err("Patch-ID 0x%08x: size mismatch.\n", mc_hdr->patch_id);
 		return crnt_size;