Bug #17154: Recode memory corruption

From: k.joe@freemail.hu Operating system: Linux2.2.19/Debian PHP version: 4.1.2 PHP Bug Type: Recode related Bug description: Recode memory corruption Recode function somehow fails to calculate length of the result string, this cause (mostly) random segfaults. In this example, the FOR will stop at different cyclcount, which count depends on running mode: apache module, cgi from shell, cgi from gdb, and the operations on the string before calling recode. The result of recoding in the file is so weird, at several places the two string's length doesn't equal (like some buffer owerflow problem.) PHP versions 4.0.6-4.1.2 (with recode 3.6) are all affected (commandline recode is works well). <? $fp = fopen("ideni","w"); for ($i = 0; $i < 10240; $i++) { echo "$i\n"; $str = str_repeat("a",$i); if (strlen($str) != strlen(recode("utf8..latin2",$str))) { $fstr = "\n$i: $str"; $rstr = "\n$i: " . recode("utf8..latin2",$str); fwrite($fp,$fstr); fwrite($fp,$rstr); } } fclose($fp); ?> This backtrace made from cgi/gdb: #0 0x4024ed28 in free () from /lib/libc.so.6 #1 0x4024ea0a in malloc () from /lib/libc.so.6 #2 0x4024e1e4 in malloc () from /lib/libc.so.6 #3 0x080f5a8f in _emalloc (size=6828, __zend_filename=0x81309c2 "recode.c", __zend_lineno=142, __zend_orig_filename=0x0, __zend_orig_lineno=0) at zend_alloc.c:165 #4 0x080f61ed in _estrndup (s=0x81d64a8 'a' <repeats 200 times>..., length=6827, __zend_filename=0x81309c2 "recode.c", __zend_lineno=142, __zend_orig_filename=0x0, __zend_orig_lineno=0) at zend_alloc.c:356 #5 0x0807d88a in zif_recode_string (ht=2, return_value=0x81d2384, this_ptr=0x0, return_value_used=1) at recode.c:142 #6 0x0812594a in execute (op_array=0x81cddbc) at ./zend_execute.c:1590 #7 0x08107309 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at zend.c:814 #8 0x0805f411 in php_execute_script (primary_file=0xbffffd04) at main.c:1307 #9 0x0805cc8c in main (argc=3, argv=0xbffffd94) at cgi_main.c:738 #10 0x401f96cf in __libc_start_main () from /lib/libc.so.6 (gdb) frame 6 #6 0x0812594a in execute (op_array=0x81cddbc) at ./zend_execute.c:1590 1590 ((zend_internal_function *) function_state.function)->handler(opline->extended_value, Ts[opline->result.u.var].var.ptr, object.ptr, return_value_used TSRMLS_CC); Good luck! -- Edit bug report at http://bugs.php.net/?id=17154&edit=1 -- Fixed in CVS: http://bugs.php.net/fix.php?id=17154&r=fixedcvs Fixed in release: http://bugs.php.net/fix.php?id=17154&r=alreadyfixed Need backtrace: http://bugs.php.net/fix.php?id=17154&r=needtrace Try newer version: http://bugs.php.net/fix.php?id=17154&r=oldversion Not developer issue: http://bugs.php.net/fix.php?id=17154&r=support Expected behavior: http://bugs.php.net/fix.php?id=17154&r=notwrong Not enough info: http://bugs.php.net/fix.php?id=17154&r=notenoughinfo Submitted twice: http://bugs.php.net/fix.php?id=17154&r=submittedtwice register_globals: http://bugs.php.net/fix.php?id=17154&r=globals