diff --git a/module/lsm.c b/module/lsm.c
index 092146b5f..3bf5457da 100644
--- a/module/lsm.c
+++ b/module/lsm.c
@@ -667,11 +667,6 @@ static int subdomain_getprocattr(struct task_struct *p, char *name, void *value,
 		goto out;
 	}
 
-	if (!size) {
-		error = -ERANGE;
-		goto out;
-	}
-
 	/* must be task querying itself or admin */
 	if (current != p && !capable(CAP_SYS_ADMIN)) {
 		error = -EPERM;
diff --git a/module/procattr.c b/module/procattr.c
index 952ae0e41..4eb1d7b4a 100644
--- a/module/procattr.c
+++ b/module/procattr.c
@@ -52,6 +52,8 @@ size_t sd_getprocattr(struct subdomain *sd, char *str, size_t size)
 			str += lenm;
 			*str++ = '\n';
 			error = len;
+		} else if (size == 0) {
+			error = len;
 		} else {
 			error = -ERANGE;
 		}
@@ -63,6 +65,8 @@ size_t sd_getprocattr(struct subdomain *sd, char *str, size_t size)
 		if (len <= size) {
 			memcpy(str, unconstrained_str, len);
 			error = len;
+		} else if (size == 0) {
+			error = len;
 		} else {
 			error = -ERANGE;
 		}