diff -up less-590/lesskey_parse.c.fix_sast2 less-590/lesskey_parse.c
--- less-590/lesskey_parse.c.fix_sast2	2024-08-06 23:42:33.839079731 +0200
+++ less-590/lesskey_parse.c	2024-08-06 23:47:17.433874330 +0200
@@ -548,9 +548,9 @@ parse_lesskey(infile, tables)
 	FILE *desc;
 	char line[1024];
 
-	if (infile == NULL)
-		infile = homefile(DEF_LESSKEYINFILE);
-	lesskey_file = infile;
+	lesskey_file = (infile != NULL) ? strdup(infile) : homefile(DEF_LESSKEYINFILE);
+	if (lesskey_file == NULL)
+		return (-1);
 
 	init_tables(tables);
 	errors = 0;
@@ -559,22 +559,29 @@ parse_lesskey(infile, tables)
 	/*
 	 * Open the input file.
 	 */
-	if (strcmp(infile, "-") == 0)
+	if (strcmp(lesskey_file, "-") == 0)
 		desc = stdin;
-	else if ((desc = fopen(infile, "r")) == NULL)
+	else if ((desc = fopen(lesskey_file, "r")) == NULL)
 	{
-		/* parse_error("cannot open lesskey file ", infile); */
-		return (-1);
+		/* parse_error("cannot open lesskey file %s", lesskey_file); */
+		errors = -1;
 	}
 
 	/*
 	 * Read and parse the input file, one line at a time.
 	 */
-	while (fgets(line, sizeof(line), desc) != NULL)
+	if (desc != NULL)
 	{
-		++linenum;
-		parse_line(line, tables);
+		while (fgets(line, sizeof(line), desc) != NULL)
+		{
+			++linenum;
+			parse_line(line, tables);
+		}
+		if (desc != stdin)
+			fclose(desc);
 	}
+	free(lesskey_file);
+	lesskey_file = NULL;
 
 	return (errors);
 }