res_config_pgsql: Fix a memory leak and use RAII_VAR for cleanup when practical

Review: https://reviewboard.asterisk.org/r/3141/
........

Merged revisions 406360 from http://svn.asterisk.org/svn/asterisk/branches/1.8

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/11@406361 65c4cc65-6c06-0410-ace0-fbb531ad65f3

diff --git a/res/res_config_pgsql.c b/res/res_config_pgsql.c
index 252e599d04c86becdedf79668663c6eeccf2217a..40e46d2d9804ec745f1c615f1232b65e787acf72 100644 (file)
--- a/res/res_config_pgsql.c
+++ b/res/res_config_pgsql.c
@@ -252,8 +252,8 @@ static struct tables *find_table(const char *database, const char *orig_tablenam
        struct columns *column;
        struct tables *table;
        struct ast_str *sql = ast_str_thread_get(&findtable_buf, 330);
-        PGresult *result;
-        int exec_result;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
+       int exec_result;
        char *fname, *ftype, *flen, *fnotnull, *fdef;
        int i, rows;
 
@@ -339,14 +339,12 @@ static struct tables *find_table(const char *database, const char *orig_tablenam
        ast_debug(1, "Query of table structure complete.  Now retrieving results.\n");
        if (exec_result != 0) {
                ast_log(LOG_ERROR, "Failed to query database columns for table %s\n", orig_tablename);
-               PQclear(result);
                AST_LIST_UNLOCK(&psql_tables);
                return NULL;
        }
 
        if (!(table = ast_calloc(1, sizeof(*table) + strlen(orig_tablename) + 1))) {
                ast_log(LOG_ERROR, "Unable to allocate memory for new table structure\n");
-               PQclear(result);
                AST_LIST_UNLOCK(&psql_tables);
                return NULL;
        }
@@ -365,7 +363,6 @@ static struct tables *find_table(const char *database, const char *orig_tablenam
 
                if (!(column = ast_calloc(1, sizeof(*column) + strlen(fname) + strlen(ftype) + 2))) {
                        ast_log(LOG_ERROR, "Unable to allocate column element for %s, %s\n", orig_tablename, fname);
-                       PQclear(result);
                        destroy_table(table);
                        AST_LIST_UNLOCK(&psql_tables);
                        return NULL;
@@ -395,7 +392,6 @@ static struct tables *find_table(const char *database, const char *orig_tablenam
                }
                AST_LIST_INSERT_TAIL(&table->columns, column, list);
        }
-       PQclear(result);
 
        AST_LIST_INSERT_TAIL(&psql_tables, table, list);
        ast_rwlock_rdlock(&table->lock);
@@ -420,7 +416,7 @@ static struct columns *find_column(struct tables *t, const char *colname)
 
 static struct ast_variable *realtime_pgsql(const char *database, const char *tablename, va_list ap)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        int num_rows = 0, pgresult;
        struct ast_str *sql = ast_str_thread_get(&sql_buf, 100);
        struct ast_str *escapebuf = ast_str_thread_get(&escapebuf_buf, 100);
@@ -485,7 +481,6 @@ static struct ast_variable *realtime_pgsql(const char *database, const char *tab
        ast_mutex_lock(&pgsql_lock);
 
         if (pgsql_exec(database, tablename, ast_str_buffer(sql), &result) != 0) {
-               PQclear(result);
                ast_mutex_unlock(&pgsql_lock);
                return NULL;
         }
@@ -501,7 +496,6 @@ static struct ast_variable *realtime_pgsql(const char *database, const char *tab
                ast_debug(1, "PostgreSQL RealTime: Found %d rows.\n", num_rows);
 
                if (!(fieldnames = ast_calloc(1, numFields * sizeof(char *)))) {
-                       PQclear(result);
                        ast_mutex_unlock(&pgsql_lock);
                        return NULL;
                }
@@ -530,7 +524,6 @@ static struct ast_variable *realtime_pgsql(const char *database, const char *tab
                ast_debug(1, "Postgresql RealTime: Could not find any rows in table %s@%s.\n", tablename, database);
        }
 
-       PQclear(result);
        ast_mutex_unlock(&pgsql_lock);
 
        return var;
@@ -538,7 +531,7 @@ static struct ast_variable *realtime_pgsql(const char *database, const char *tab
 
 static struct ast_config *realtime_multi_pgsql(const char *database, const char *table, va_list ap)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        int num_rows = 0, pgresult;
        struct ast_str *sql = ast_str_thread_get(&sql_buf, 100);
        struct ast_str *escapebuf = ast_str_thread_get(&escapebuf_buf, 100);
@@ -639,7 +632,6 @@ static struct ast_config *realtime_multi_pgsql(const char *database, const char
                        ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
                        ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
                                                PQresultErrorMessage(result), PQresStatus(result_status));
-                       PQclear(result);
                        ast_mutex_unlock(&pgsql_lock);
                        ast_config_destroy(cfg);
                        return NULL;
@@ -657,7 +649,6 @@ static struct ast_config *realtime_multi_pgsql(const char *database, const char
                ast_debug(1, "PostgreSQL RealTime: Found %d rows.\n", num_rows);
 
                if (!(fieldnames = ast_calloc(1, numFields * sizeof(char *)))) {
-                       PQclear(result);
                        ast_mutex_unlock(&pgsql_lock);
                        ast_config_destroy(cfg);
                        return NULL;
@@ -689,7 +680,6 @@ static struct ast_config *realtime_multi_pgsql(const char *database, const char
                ast_debug(1, "PostgreSQL RealTime: Could not find any rows in table %s.\n", table);
        }
 
-       PQclear(result);
        ast_mutex_unlock(&pgsql_lock);
 
        return cfg;
@@ -698,7 +688,7 @@ static struct ast_config *realtime_multi_pgsql(const char *database, const char
 static int update_pgsql(const char *database, const char *tablename, const char *keyfield,
                                                const char *lookup, va_list ap)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        int numrows = 0, pgresult;
        const char *newparam, *newval;
        struct ast_str *sql = ast_str_thread_get(&sql_buf, 100);
@@ -805,7 +795,6 @@ static int update_pgsql(const char *database, const char *tablename, const char
                        ast_debug(1, "PostgreSQL RealTime: Query: %s\n", ast_str_buffer(sql));
                        ast_debug(1, "PostgreSQL RealTime: Query Failed because: %s (%s)\n",
                                                PQresultErrorMessage(result), PQresStatus(result_status));
-                       PQclear(result);
                        ast_mutex_unlock(&pgsql_lock);
                        return -1;
                }
@@ -830,7 +819,7 @@ static int update_pgsql(const char *database, const char *tablename, const char
 
 static int update2_pgsql(const char *database, const char *tablename, va_list ap)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        int numrows = 0, pgresult, first = 1;
        struct ast_str *escapebuf = ast_str_thread_get(&escapebuf_buf, 16);
        const char *newparam, *newval;
@@ -945,7 +934,7 @@ static int update2_pgsql(const char *database, const char *tablename, va_list ap
 
 static int store_pgsql(const char *database, const char *table, va_list ap)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        Oid insertid;
        struct ast_str *buf = ast_str_thread_get(&escapebuf_buf, 256);
        struct ast_str *sql1 = ast_str_thread_get(&sql_buf, 256);
@@ -1007,7 +996,6 @@ static int store_pgsql(const char *database, const char *table, va_list ap)
         }
 
        insertid = PQoidValue(result);
-       PQclear(result);
        ast_mutex_unlock(&pgsql_lock);
 
        ast_debug(1, "PostgreSQL RealTime: row inserted on table: %s, id: %u\n", table, insertid);
@@ -1026,7 +1014,7 @@ static int store_pgsql(const char *database, const char *table, va_list ap)
 
 static int destroy_pgsql(const char *database, const char *table, const char *keyfield, const char *lookup, va_list ap)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        int numrows = 0;
        int pgresult;
        struct ast_str *sql = ast_str_thread_get(&sql_buf, 256);
@@ -1108,7 +1096,7 @@ static struct ast_config *config_pgsql(const char *database, const char *table,
                                                                           const char *file, struct ast_config *cfg,
                                                                           struct ast_flags flags, const char *suggested_incl, const char *who_asked)
 {
-       PGresult *result = NULL;
+       RAII_VAR(PGresult *, result, NULL, PQclear);
        long num_rows;
        struct ast_variable *new_v;
        struct ast_category *cur_cat = NULL;
@@ -1155,7 +1143,6 @@ static struct ast_config *config_pgsql(const char *database, const char *table,
                        char *field_cat_metric = PQgetvalue(result, rowIndex, 3);
                        if (!strcmp(field_var_name, "#include")) {
                                if (!ast_config_internal_load(field_var_val, cfg, flags, "", who_asked)) {
-                                       PQclear(result);
                                        ast_mutex_unlock(&pgsql_lock);
                                        return NULL;
                                }
@@ -1178,7 +1165,6 @@ static struct ast_config *config_pgsql(const char *database, const char *table,
                                "PostgreSQL RealTime: Could not find config '%s' in database.\n", file);
        }
 
-       PQclear(result);
        ast_mutex_unlock(&pgsql_lock);
 
        return cfg;
@@ -1298,7 +1284,7 @@ static int require_pgsql(const char *database, const char *tablename, va_list ap
                                ast_debug(1, "About to run ALTER query on table '%s' to add column '%s'\n", tablename, elm);
 
                                if (pgsql_exec(database, tablename, ast_str_buffer(sql), &result) != 0) {
-                                       ast_mutex_unlock(&pgsql_lock);
+                                               ast_mutex_unlock(&pgsql_lock);
                                        return -1;
                                }