FS-12048: [Core] Fix leak in SQLite (switch_cache_db_execute_sql2str) when queries return a NULL containing field which may result in high memory consumption.

2019-09-13 20:28:38 +04:00 · 2019-09-13 20:28:38 +04:00 · 4eca43bc62
parent fc61fcfe60
commit 4eca43bc62
7 changed files with 319 additions and 35 deletions
--- a/Freeswitch.2017.sln
+++ b/Freeswitch.2017.sln
@ -586,6 +586,8 @@ Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mod_pgsql", "src\mod\databa
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mod_mariadb", "src\mod\databases\mod_mariadb\mod_mariadb.2017.vcxproj", "{0B612F84-7533-4DEC-AEDD-5C9CBCF15EAC}"
 EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "test_switch_core_db", "tests\unit\test_switch_core_db.2017.vcxproj", "{580675D7-C1C9-4197-AAC5-00F64FAFDE78}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		All|Win32 = All|Win32
@ -2689,6 +2691,18 @@ Global
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 		{0B612F84-7533-4DEC-AEDD-5C9CBCF15EAC}.Release|x64.Build.0 = Release|x64
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.All|Win32.ActiveCfg = Release|Win32
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.All|Win32.Build.0 = Release|Win32
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.All|x64.ActiveCfg = Release|x64
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.All|x64.Build.0 = Release|x64
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Debug|Win32.ActiveCfg = Debug|Win32
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Debug|Win32.Build.0 = Debug|Win32
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Debug|x64.ActiveCfg = Debug|x64
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Debug|x64.Build.0 = Debug|x64
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Release|Win32.ActiveCfg = Release|Win32
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Release|Win32.Build.0 = Release|Win32
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Release|x64.ActiveCfg = Release|x64
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78}.Release|x64.Build.0 = Release|x64
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 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@ -2901,6 +2915,7 @@ Global
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 		{0B612F84-7533-4DEC-AEDD-5C9CBCF15EAC} = {31C2761D-20E0-4BF8-98B9-E32F0D8DD6E1}
+		{580675D7-C1C9-4197-AAC5-00F64FAFDE78} = {9388C266-C3FC-468A-92EF-0CBC35941412}
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--- a/src/include/switch_core_db.h
+++ b/src/include/switch_core_db.h
@ -103,41 +103,42 @@ SWITCH_DECLARE(int) switch_core_db_close(switch_core_db_t *db);
 SWITCH_DECLARE(int) switch_core_db_open(const char *filename, switch_core_db_t **ppDb);

 /**
- * The next group of routines returns information about the information
- * in a single column of the current result row of a query.  In every
- * case the first parameter is a pointer to the SQL statement that is being
- * executed (the switch_core_db_stmt_t* that was returned from switch_core_db_prepare()) and
- * the second argument is the index of the column for which information
- * should be returned.  iCol is zero-indexed.  The left-most column as an
- * index of 0.
+ * ^Strings returned by sqlite3_column_text() and sqlite3_column_text16(),
+ * even empty strings, are always zero-terminated.  ^The return
+ * value from sqlite3_column_blob() for a zero-length BLOB is a NULL pointer.
 *
- * If the SQL statement is not currently point to a valid row, or if the
- * the colulmn index is out of range, the result is undefined.
+ * ^The object returned by [sqlite3_column_value()] is an
+ * [unprotected sqlite3_value] object.  An unprotected sqlite3_value object
+ * may only be used with [sqlite3_bind_value()] and [sqlite3_result_value()].
+ * If the [unprotected sqlite3_value] object returned by
+ * [sqlite3_column_value()] is used in any other way, including calls
+ * to routines like [sqlite3_value_int()], [sqlite3_value_text()],
+ * or [sqlite3_value_bytes()], then the behavior is undefined.
 *
- * These routines attempt to convert the value where appropriate.  For
+ * These routines attempt to convert the value where appropriate.  ^For
 * example, if the internal representation is FLOAT and a text result
- * is requested, sprintf() is used internally to do the conversion
- * automatically.  The following table details the conversions that
- * are applied:
+ * is requested, [sqlite3_snprintf()] is used internally to perform the
+ * conversion automatically.  ^(The following table details the conversions
+ * that are applied:
 *
 *    Internal Type    Requested Type     Conversion
 *    -------------    --------------    --------------------------
 *       NULL             INTEGER         Result is 0
 *       NULL             FLOAT           Result is 0.0
- *       NULL             TEXT            Result is an empty string
- *       NULL             BLOB            Result is a zero-length BLOB
+ *       NULL             TEXT            Result is a NULL pointer
+ *       NULL             BLOB            Result is a NULL pointer
 *       INTEGER          FLOAT           Convert from integer to float
 *       INTEGER          TEXT            ASCII rendering of the integer
- *       INTEGER          BLOB            Same as for INTEGER->TEXT
- *       FLOAT            INTEGER         Convert from float to integer
+ *       INTEGER          BLOB            Same as INTEGER->TEXT
+ *       FLOAT            INTEGER         [CAST] to INTEGER
 *       FLOAT            TEXT            ASCII rendering of the float
- *       FLOAT            BLOB            Same as FLOAT->TEXT
- *       TEXT             INTEGER         Use atoi()
- *       TEXT             FLOAT           Use atof()
+ *       FLOAT            BLOB            [CAST] to BLOB
+ *       TEXT             INTEGER         [CAST] to INTEGER
+ *       TEXT             FLOAT           [CAST] to REAL
 *       TEXT             BLOB            No change
- *       BLOB             INTEGER         Convert to TEXT then use atoi()
- *       BLOB             FLOAT           Convert to TEXT then use atof()
- *       BLOB             TEXT            Add a "\000" terminator if needed
+ *       BLOB             INTEGER         [CAST] to INTEGER
+ *       BLOB             FLOAT           [CAST] to REAL
+ *       BLOB             TEXT            Add a zero terminator if needed
 *
 *  Return the value as UTF-8 text.
 */
--- a/src/switch_core_db.c
+++ b/src/switch_core_db.c
@ -57,15 +57,7 @@ SWITCH_DECLARE(int) switch_core_db_close(switch_core_db_t *db)

 SWITCH_DECLARE(const unsigned char *) switch_core_db_column_text(switch_core_db_stmt_t *stmt, int iCol)
 {
-	const unsigned char *txt = sqlite3_column_text(stmt, iCol);
-
-	if (!strcasecmp((char *) stmt, "(null)")) {
-		memset(stmt, 0, 1);
-		txt = NULL;
-	}
-
-	return txt;
-
+	return sqlite3_column_text(stmt, iCol);
 }

 SWITCH_DECLARE(const char *) switch_core_db_column_name(switch_core_db_stmt_t *stmt, int N)
--- a/src/switch_core_sqldb.c
+++ b/src/switch_core_sqldb.c
@ -884,8 +884,6 @@ SWITCH_DECLARE(char *) switch_cache_db_execute_sql2str(switch_cache_db_handle_t
 							if ((txt = switch_core_db_column_text(stmt, 0))) {
 								switch_copy_string(str, (char *) txt, len);
 								status = SWITCH_STATUS_SUCCESS;
-							} else {
-								goto end;
 							}
 						}
 						break;
--- a/tests/unit/Makefile.am
+++ b/tests/unit/Makefile.am
@ -2,7 +2,7 @@ include $(top_srcdir)/build/modmake.rulesam

 noinst_PROGRAMS = switch_event switch_hash switch_ivr_originate switch_utils switch_core switch_console switch_vpx switch_core_file \
 			   switch_ivr_play_say switch_core_codec switch_rtp
-noinst_PROGRAMS+= switch_core_video
+noinst_PROGRAMS+= switch_core_video switch_core_db
 AM_LDFLAGS  = -avoid-version -no-undefined $(SWITCH_AM_LDFLAGS) $(openssl_LIBS)
 AM_LDFLAGS += $(FREESWITCH_LIBS) $(switch_builddir)/libfreeswitch.la $(CORE_LIBS) $(APR_LIBS)
 AM_CFLAGS   = $(SWITCH_AM_CPPFLAGS)
--- a/tests/unit/switch_core_db.c
+++ b/tests/unit/switch_core_db.c
@ -0,0 +1,75 @@
+/*
+ * FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ * Copyright (C) 2005-2018, Anthony Minessale II <anthm@freeswitch.org>
+ *
+ * Version: MPL 1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
+ *
+ * The Initial Developer of the Original Code is
+ * Anthony Minessale II <anthm@freeswitch.org>
+ * Portions created by the Initial Developer are Copyright (C)
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ * Chris Rienzo <chris@signalwire.com>
+ * Andrey Volk <andrey@signalwire.com>
+ *
+ *
+ * switch_core_db.c -- tests core db functions
+ *
+ */
+#include <switch.h>
+#include <stdlib.h>
+
+#include <test/switch_test.h>
+
+FST_CORE_BEGIN("./conf")
+{
+	FST_SUITE_BEGIN(switch_core_db)
+	{
+		FST_SETUP_BEGIN()
+		{
+		}
+		FST_SETUP_END()
+
+		FST_TEARDOWN_BEGIN()
+		{
+		}
+		FST_TEARDOWN_END()
+
+		FST_TEST_BEGIN(test_switch_cache_db_execute_sql2str)
+		{
+			switch_cache_db_handle_t *dbh = NULL;
+			char *dsn = "test_switch_cache_db_execute_sql2str.db";
+			char res1[20] = "test";
+			char res2[20] = "test";
+
+			if (switch_cache_db_get_db_handle_dsn(&dbh, dsn) == SWITCH_STATUS_SUCCESS) {
+
+				switch_cache_db_execute_sql2str(dbh, "SELECT 1", (char *)&res1, 20, NULL);
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "SELECT 1: %s\n", switch_str_nil(res1));
+
+				switch_cache_db_execute_sql2str(dbh, "SELECT NULL", (char *)&res2, 20, NULL);
+				switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "SELECT NULL: %s\n", switch_str_nil(res2));
+
+			}
+
+			fst_check_string_equals(res1, "1");
+			fst_check_string_equals(res2, "");
+		}
+		FST_TEST_END()
+	}
+	FST_SUITE_END()
+}
+FST_CORE_END()
--- a/tests/unit/test_switch_core_db.2017.vcxproj
+++ b/tests/unit/test_switch_core_db.2017.vcxproj
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