Fix memory leaks when plugin gets no results

Signed-off-by: Florian Forster <octo@collectd.org>

diff --git a/src/mysql.c b/src/mysql.c
index 69df7c708acce1c9f19a034cb2eb094590d46a02..6f9efe356c923d6b7a390b0d8974059a6c5d6a3b 100644 (file)
--- a/src/mysql.c
+++ b/src/mysql.c
@@ -557,6 +557,7 @@ static int mysql_read_master_stats (mysql_database_t *db, MYSQL *con)
        {
                ERROR ("mysql plugin: Failed to get master statistics: "
                                "`%s' did not return any rows.", query);
+               mysql_free_result (res);
                return (-1);
        }
 
@@ -565,6 +566,7 @@ static int mysql_read_master_stats (mysql_database_t *db, MYSQL *con)
        {
                ERROR ("mysql plugin: Failed to get master statistics: "
                                "`%s' returned less than two columns.", query);
+               mysql_free_result (res);
                return (-1);
        }
 
@@ -608,6 +610,7 @@ static int mysql_read_slave_stats (mysql_database_t *db, MYSQL *con)
        {
                ERROR ("mysql plugin: Failed to get slave statistics: "
                                "`%s' did not return any rows.", query);
+               mysql_free_result (res);
                return (-1);
        }
 
@@ -616,6 +619,7 @@ static int mysql_read_slave_stats (mysql_database_t *db, MYSQL *con)
        {
                ERROR ("mysql plugin: Failed to get slave statistics: "
                                "`%s' returned less than 33 columns.", query);
+               mysql_free_result (res);
                return (-1);
        }