From: ben at thelemite dot freeserve dot co dot uk Operating system: Solaris 10 PHP version: 5.2.0 PHP Bug Type: MSSQL related Bug description: Crash when using 64-bit fields
Description: ------------ Executing SELECT * queries on tables that contain 64-bit values (such as bigints) cause a seg fault. Segfault occurs in php_mssql_get_column_content_with_type within php_mssql.c It's probably system dependent but has been verified on a separate Solaris 10 setup. Note the following things though: 1) Running queries containing 64-bit fields that do not contain the primary key do not seem to cause the crash, e.g: "SELECT value from TestTable", but individually selecting fields does, e.g: "SELECT id,value". Bizzarely "SELECT value,id" doesn't cause a crash. 2) There seems to be some weird allocation issues going on that I have not been able to get to the bottom of. In php_mssql_get_column_content_with_type there is: case SQLFLT8: ZVAL_DOUBLE(result, (double) floatcol8(offset)); break; If I change it to: case SQLFLT8: { DBFLT8 res_buf; memcpy(&res_buf, &floatcol8(offset), 8); ZVAL_DOUBLE(result, res_buf); } break; It cures the problem! But (very bizzarely), the following code still crashes: res_buf = *(DBFLT8 *)dbdata(mssql_ptr->link,offset); ZVAL_DOUBLE(result, res_buf); BUT... It does not crash at the point of reading the data into res_buf. It's crashes when something is done with the value! (Possibly FreeTDS is corrupting the stack?). Help! SunOS 5.10 Generic_118833-17 sun4u sparc SUNW,Ultra-60 PHP 5.1.6 (cli) (built: Oct 26 2006 15:30:54) [same on 5.2.0 as well though] FreeTDS 0.63 Reproduce code: --------------- Table I have been using for experimenting:- TestTable { id, int value, bigint } PHP code to generate crash:- $link = mssql_connect("MyServer","MyUser","MyPassword"); $q = mssql_query("SELECT * from TestTable"); echo $q; Expected result: ---------------- Resource id #X Actual result: -------------- nothing (segfaults when run from CLI) -- Edit bug report at http://bugs.php.net/?id=39460&edit=1 -- Try a CVS snapshot (PHP 4.4): http://bugs.php.net/fix.php?id=39460&r=trysnapshot44 Try a CVS snapshot (PHP 5.2): http://bugs.php.net/fix.php?id=39460&r=trysnapshot52 Try a CVS snapshot (PHP 6.0): http://bugs.php.net/fix.php?id=39460&r=trysnapshot60 Fixed in CVS: http://bugs.php.net/fix.php?id=39460&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=39460&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=39460&r=needtrace Need Reproduce Script: http://bugs.php.net/fix.php?id=39460&r=needscript Try newer version: http://bugs.php.net/fix.php?id=39460&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=39460&r=support Expected behavior: http://bugs.php.net/fix.php?id=39460&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=39460&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=39460&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=39460&r=globals PHP 3 support discontinued: http://bugs.php.net/fix.php?id=39460&r=php3 Daylight Savings: http://bugs.php.net/fix.php?id=39460&r=dst IIS Stability: http://bugs.php.net/fix.php?id=39460&r=isapi Install GNU Sed: http://bugs.php.net/fix.php?id=39460&r=gnused Floating point limitations: http://bugs.php.net/fix.php?id=39460&r=float No Zend Extensions: http://bugs.php.net/fix.php?id=39460&r=nozend MySQL Configuration Error: http://bugs.php.net/fix.php?id=39460&r=mysqlcfg