Check the return value from snprintf().
[oweals/tinc.git] / src / conf.c
index c933f09..4497b0e 100644 (file)
@@ -432,7 +432,11 @@ bool read_server_config(void) {
 
                                // And we try to read the ones that end with ".conf"
                                if(l > 5 && !strcmp(".conf", & ep->d_name[ l - 5 ])) {
-                                       snprintf(fname, sizeof(fname), "%s/%s", dname, ep->d_name);
+                                       if(snprintf(fname, sizeof(fname), "%s/%s", dname, ep->d_name) >= sizeof(fname)) {
+                                               logger(LOG_ERR, "Pathname too long: %s/%s", dname, ep->d_name);
+                                               return false;
+                                       }
+
                                        x = read_config_file(config_tree, fname);
                                }
                        }
@@ -573,7 +577,12 @@ FILE *ask_and_open(const char *filename, const char *what) {
 #endif
                /* The directory is a relative path or a filename. */
                getcwd(directory, sizeof(directory));
-               snprintf(abspath, sizeof(abspath), "%s/%s", directory, fn);
+
+               if(snprintf(abspath, sizeof(abspath), "%s/%s", directory, fn) >= sizeof(abspath)) {
+                       fprintf(stderr, "Pathname too long: %s/%s\n", directory, fn);
+                       return NULL;
+               }
+
                fn = abspath;
        }