diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c
index cd06229db394..ec8731515333 100644
--- a/drivers/pwm/core.c
+++ b/drivers/pwm/core.c
@@ -2295,8 +2295,9 @@ static long pwm_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long ar
 				.duty_offset_ns = wf.duty_offset_ns,
 			};
 
-			return copy_to_user((struct pwmchip_waveform __user *)arg,
-					    &cwf, sizeof(cwf));
+			ret = copy_to_user((struct pwmchip_waveform __user *)arg,
+					   &cwf, sizeof(cwf));
+			return ret ? -EFAULT : 0;
 		}
 
 	case PWM_IOCTL_GETWF:
@@ -2329,8 +2330,9 @@ static long pwm_cdev_ioctl(struct file *file, unsigned int cmd, unsigned long ar
 				.duty_offset_ns = wf.duty_offset_ns,
 			};
 
-			return copy_to_user((struct pwmchip_waveform __user *)arg,
-					    &cwf, sizeof(cwf));
+			ret = copy_to_user((struct pwmchip_waveform __user *)arg,
+					   &cwf, sizeof(cwf));
+			return ret ? -EFAULT : 0;
 		}
 
 	case PWM_IOCTL_SETROUNDEDWF: