Bug #68743 [NEW]: Infinite loop when CURLOPT_INFILESIZE doesn't match sended data

From: sjaillet at gmail dot com Operating system: Ubuntu 14.04.1 PHP version: 5.6.4 Package: cURL related Bug Type: Bug Bug description:Infinite loop when CURLOPT_INFILESIZE doesn't match sended data Description: ------------ cURL multi enter into an infinite loop when CURLOPT_INFILESIZE doesn't match the size of sended data. In the test script below I intentionally set the CURLOPT_INFILESIZE to the size of the sended data plus 1 byte. In the documentation we can see that CURLOPT_READFUNCTION should return an empty string to signal an EOF. So it's what I done in the following script. So since CURLOPT_READFUNCTION returned the EOF signal which indicates that there's nothing to wait for, I expected cURL to bail out and throwing an error (or at least timeout), but the test script run into an infinite loop instead. Test script: --------------- $options = [ CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1, CURLOPT_RETURNTRANSFER => false, CURLOPT_HEADER => false, CURLOPT_CUSTOMREQUEST => 'PUT', CURLOPT_UPLOAD => true, CURLOPT_URL => 'http://httpbin.org/put', CURLOPT_CONNECTTIMEOUT => 1, CURLOPT_HTTPHEADER => [ 'Content-Type: text/plain; charset=UTF-8', ], CURLOPT_READFUNCTION => function($handle, $fp, $length) { static $data = 'HelloWorld'; $readed = $data; $data = ''; echo "Length asked: '{$length}'\n"; echo "Readed: '{$readed}'\n"; return $readed; }, CURLOPT_INFILESIZE => strlen('HelloWorld') + 1 // The extra byte ]; $handle = curl_init(); curl_setopt_array($handle, $options); $mh = curl_multi_init(); curl_multi_add_handle($mh, $handle); $running = 0; do { if (curl_multi_select($mh) === -1) { usleep(1000); } curl_multi_exec($mh, $running); echo "Number of running request(s): '{$running}'\n"; } while ($running > 0); Expected result: ---------------- # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' Length asked: '16384' Readed: 'HelloWorld' # of running request(s): '1' Length asked: '16384' Readed: '' # of running request(s): '1' # of running request(s): '0' And a call to curl_strerror() should be able to display the error. Actual result: -------------- # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' Length asked: '16384' Readed: 'HelloWorld' # of running request(s): '1' Length asked: '16384' Readed: '' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' # of running request(s): '1' ... etc. -- Edit bug report at https://bugs.php.net/bug.php?id=68743&edit=1 -- Try a snapshot (PHP 5.4): https://bugs.php.net/fix.php?id=68743&r=trysnapshot54 Try a snapshot (PHP 5.5): https://bugs.php.net/fix.php?id=68743&r=trysnapshot55 Try a snapshot (trunk): https://bugs.php.net/fix.php?id=68743&r=trysnapshottrunk Fixed in SVN: https://bugs.php.net/fix.php?id=68743&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=68743&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=68743&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=68743&r=needscript Try newer version: https://bugs.php.net/fix.php?id=68743&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=68743&r=support Expected behavior: https://bugs.php.net/fix.php?id=68743&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=68743&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=68743&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=68743&r=globals PHP 4 support discontinued: https://bugs.php.net/fix.php?id=68743&r=php4 Daylight Savings: https://bugs.php.net/fix.php?id=68743&r=dst IIS Stability: https://bugs.php.net/fix.php?id=68743&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=68743&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=68743&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=68743&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=68743&r=mysqlcfg