diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c
index 4eecb9c7c6a0..d8a057ba0895 100644
--- a/arch/x86/lib/insn-eval.c
+++ b/arch/x86/lib/insn-eval.c

@@ -1442,27 +1442,36 @@ static int insn_get_effective_ip(struct pt_regs *regs, unsigned long *ip)
  * insn_fetch_from_user() - Copy instruction bytes from user-space memory
  * @regs:	Structure with register values as seen when entering kernel mode
  * @buf:	Array to store the fetched instruction
+ * @copied:	Pointer to an int where the number of copied instruction bytes
+ *		is stored. Can be NULL.
  *
  * Gets the linear address of the instruction and copies the instruction bytes
  * to the buf.
  *
  * Returns:
  *
- * Number of instruction bytes copied.
+ * -EINVAL if the linear address of the instruction could not be calculated
+ * -EFAULT if nothing was copied
+ *       0 on success
  *
- * 0 if nothing was copied.
  */
-int insn_fetch_from_user(struct pt_regs *regs, unsigned char buf[MAX_INSN_SIZE])
+int insn_fetch_from_user(struct pt_regs *regs, unsigned char buf[MAX_INSN_SIZE],
+			 int *copied)
 {
 	unsigned long ip;
 	int not_copied;
+	int bytes;
 
 	if (insn_get_effective_ip(regs, &ip))
-		return 0;
+		return -EINVAL;
 
 	not_copied = copy_from_user(buf, (void __user *)ip, MAX_INSN_SIZE);
 
-	return MAX_INSN_SIZE - not_copied;
+	bytes = MAX_INSN_SIZE - not_copied;
+	if (copied)
+		*copied = bytes;
+
+	return bytes ? 0 : -EFAULT;