4 files changed, 20 insertions, 1 deletions
diff --git a/src/basic/errno-list.h b/src/basic/errno-list.h
index acd70950d..0f8716160 100644
--- a/src/basic/errno-list.h
+++ b/src/basic/errno-list.h
@@ -20,6 +20,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+//#include <stdbool.h>
 /*
  * MAX_ERRNO is defined as 4095 in linux/err.h
  * We use the same value here.
@@ -30,3 +31,6 @@ const char *errno_to_name(int id);
 int errno_from_name(const char *name);
 #if 0 /// UNNEEDED by elogind
 #endif // 0
+static inline bool errno_is_valid(int n) {
+        return n > 0 && n <= ERRNO_MAX;
+}
diff --git a/src/basic/parse-util.c b/src/basic/parse-util.c
index 37f6a08c3..ea902ed96 100644
--- a/src/basic/parse-util.c
+++ b/src/basic/parse-util.c
@@ -288,7 +288,8 @@ int parse_errno(const char *t) {
         if (r < 0)
                 return r;
 
-        if (e < 0 || e > ERRNO_MAX)
+        /* 0 is also allowed here */
+        if (!errno_is_valid(e) && e != 0)
                 return -ERANGE;
 
         return e;
diff --git a/src/basic/process-util.h b/src/basic/process-util.h
index 9128d0b2c..efefbee4a 100644
--- a/src/basic/process-util.h
+++ b/src/basic/process-util.h
@@ -149,6 +149,13 @@ static inline bool pid_is_valid(pid_t p) {
         return p > 0;
 }
 
+static inline int sched_policy_to_string_alloc_with_check(int n, char **s) {
+        if (!sched_policy_is_valid(n))
+                return -EINVAL;
+
+        return sched_policy_to_string_alloc(n, s);
+}
+
 #if 0 /// UNNEEDED by elogind
 int ioprio_parse_priority(const char *s, int *ret);
 #endif // 0
diff --git a/src/basic/signal-util.h b/src/basic/signal-util.h
index 2343ca80f..a66699179 100644
--- a/src/basic/signal-util.h
+++ b/src/basic/signal-util.h
@@ -59,3 +59,10 @@ static inline void block_signals_reset(sigset_t *ss) {
 static inline bool SIGNAL_VALID(int signo) {
         return signo > 0 && signo < _NSIG;
 }
+
+static inline const char* signal_to_string_with_check(int n) {
+        if (!SIGNAL_VALID(n))
+                return NULL;
+
+        return signal_to_string(n);
+}