Add a missing check for a pathname being too long.
[oweals/tinc.git] / src / conf.c
index 58d7b6d..3f81877 100644 (file)
@@ -467,9 +467,14 @@ static void disable_old_keys(const char *filename) {
                return;
        }
 
-       snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
+       int len = snprintf(tmpfile, sizeof(tmpfile), "%s.tmp", filename);
 
-       w = fopen(tmpfile, "w");
+       if(len < 0 || len >= PATH_MAX) {
+               fprintf(stderr, "Pathname too long: %s.tmp\n", filename);
+               w = NULL;
+       } else {
+               w = fopen(tmpfile, "w");
+       }
 
        while(fgets(buf, sizeof(buf), r)) {
                if(!strncmp(buf, "-----BEGIN RSA", 14)) {