Fix: session name max length was not handled correctly

[lttng-tools.git] / src / bin / lttng / conf.c

diff --git a/src/bin/lttng/conf.c b/src/bin/lttng/conf.c
index 7439c1cdcf4d0fac711f7a5f4acfbd018a83a773..b6632fcb144c052fa0ef4a9652843a074abd64c7 100644 (file)
--- a/src/bin/lttng/conf.c
+++ b/src/bin/lttng/conf.c
@@ -40,6 +40,7 @@ char *config_get_file_path(char *path)
        ret = asprintf(&file_path, "%s/%s", path, CONFIG_FILENAME);
        if (ret < 0) {
                ERR("Fail allocating config file path");
+               file_path = NULL;
        }
 
        return file_path;
@@ -248,14 +249,16 @@ found:
 int config_add_session_name(char *path, char *name)
 {
        int ret;
-       char session_name[NAME_MAX];
+       char *attr = "session=";
+       /* Max name len accepted plus attribute's len and the NULL byte. */
+       char session_name[NAME_MAX + strlen(attr) + 1];
 
        /*
         * With GNU C <  2.1, snprintf returns -1 if the target buffer is too small;
         * With GNU C >= 2.1, snprintf returns the required size (excluding closing null)
         */
-       ret = snprintf(session_name, NAME_MAX, "session=%s\n", name);
-       if ((ret < 0) || (ret >= NAME_MAX)) {
+       ret = snprintf(session_name, sizeof(session_name), "%s%s\n", attr, name);
+       if (ret < 0) {
                ret = -1;
                goto error;
        }