Bug #54221 [NEW]: mysqli::get_warnings segfault when used in multi queries

From: Operating system: PHP version: 5.3.5 Package: MySQLi related Bug Type: Bug Bug description:mysqli::get_warnings segfault when used in multi queries Description: ------------ http://php.net/manual/en/mysqli.get-warnings.php can't use mysqli::get_warnings with multi queries reliably as it will get either segfault or empty result. the code is supposed to print 2 times warning: "Warning: 1050: Table 'a' already exists" "Warning: 1050: Table 'a' already exists" but instead it segfaults (PHP 5.3.5). also if i run queries where only one warning is printed. it will not segfault. segfault seems to happen in ->next() call. seems is because internally this is implemented as "SHOW WARNINGS" query [1] [1] http://svn.php.net/viewvc/php/php- src/branches/PHP_5_3/ext/mysqli/mysqli_warning.c?annotate=306939#l76 segfault must be fixed, but regarding the usage, perhaps document that you can't use it sanely with multi queries, due limitations of mysql protocol, as seems it is problem in mysql protocol, that it returns warnings only from last of the multi query Test script: --------------- <?php $dbh = new mysqli(null, null, null, "test"); if ($dbh->connect_error) { die('Connect Error (' . $dbh->connect_errno . ') ' . $dbh->connect_error); } $create = "create temporary table if not exists a (a int4)"; $query = "$create;$create";$create;"; if ($dbh->multi_query($query)) { do { $sth = $dbh->store_result(); if ($dbh->warning_count) { $e = $dbh->get_warnings(); do { echo "Warning: $e->errno: $e->message\n"; } while ($e->next()); } } while ($dbh->next_result()); } ?> -- Edit bug report at http://bugs.php.net/bug.php?id=54221&edit=1 -- Try a snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=54221&r=trysnapshot52 Try a snapshot (PHP 5.3): http://bugs.php.net/fix.php?id=54221&r=trysnapshot53 Try a snapshot (trunk): http://bugs.php.net/fix.php?id=54221&r=trysnapshottrunk Fixed in SVN: http://bugs.php.net/fix.php?id=54221&r=fixed Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=54221&r=needdocs Fixed in release: http://bugs.php.net/fix.php?id=54221&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=54221&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=54221&r=needscript Try newer version: http://bugs.php.net/fix.php?id=54221&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=54221&r=support Expected behavior: http://bugs.php.net/fix.php?id=54221&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=54221&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=54221&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=54221&r=globals PHP 4 support discontinued: http://bugs.php.net/fix.php?id=54221&r=php4 Daylight Savings: http://bugs.php.net/fix.php?id=54221&r=dst IIS Stability: http://bugs.php.net/fix.php?id=54221&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=54221&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=54221&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=54221&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=54221&r=mysqlcfg