avoid potential NULL pointer dereference when ComPath = 0, use empty …

…string instead
FDOS · Jul 10, 2021 · e3c5d68 · e3c5d68
1 parent dacdacd
commit e3c5d68
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/lib/comfile.c b/lib/comfile.c
@@ -44,8 +44,12 @@
 
 char *comFile(void)
 { char *fnam;
-
-  if(inInit || (fnam = getEnv("COMSPEC")) == 0)
+
+  if(inInit || (fnam = getEnv("COMSPEC")) == 0) {
+    /* ComPath may be a NULL reference */
+	if (!ComPath) return strdup("");
     return strdup(ComPath);
+  }
+
   return fnam;
 }