sessiond: fix: strncpy called with source length

strncpy is called with the source's length in two cases in the
session save code. Use the destination and remaining destination
length as intended by the API.

Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/src/bin/lttng-sessiond/save.c b/src/bin/lttng-sessiond/save.c
index 00cdd9364d5f4ff6c7b438debfb66972b9084e4b..3c4c3b2bce527045f7c1c9d3c09f00773fd68a07 100644 (file)
--- a/src/bin/lttng-sessiond/save.c
+++ b/src/bin/lttng-sessiond/save.c
@@ -2285,7 +2285,7 @@ int save_session(struct ltt_session *session,
        struct lttng_save_session_attr *attr, lttng_sock_cred *creds)
 {
        int ret, fd = -1;
-       char config_file_path[PATH_MAX];
+       char config_file_path[LTTNG_PATH_MAX];
        size_t len;
        struct config_writer *writer = NULL;
        size_t session_name_len;
@@ -2313,7 +2313,7 @@ int save_session(struct ltt_session *session,
                        ret = LTTNG_ERR_SET_URL;
                        goto end;
                }
-               strncpy(config_file_path, provided_path, len);
+               strncpy(config_file_path, provided_path, sizeof(config_file_path));
        } else {
                ssize_t ret_len;
                char *home_dir = utils_get_user_home_dir(
@@ -2357,7 +2357,7 @@ int save_session(struct ltt_session *session,
         * was done just above.
         */
        config_file_path[len++] = '/';
-       strncpy(config_file_path + len, session->name, session_name_len);
+       strncpy(config_file_path + len, session->name, sizeof(config_file_path) - len);
        len += session_name_len;
        strcpy(config_file_path + len, DEFAULT_SESSION_CONFIG_FILE_EXTENSION);
        len += sizeof(DEFAULT_SESSION_CONFIG_FILE_EXTENSION);