[php-src] Issue #18900: integer overflow imagefilledpolygon

Issue: https://github.com/php/php-src/issues/18900 Author: YuanchengJiang ### Description The following code: ```php <?php $im = imagecreatetruecolor(10, 10); imagealphablending($im, false); $transparent = imagecolorallocatealpha($im, 200, 0, 100, 64); for ($i = 0; $i < imagesx($im); $i++) { for ($j = 0; $j < imagesy($im); $j++) { imagesetpixel($im, $i, $j, ($i%2 != $j%2 ? $solid : $transparent)); } } $copy = imagecreatetruecolor(5, 5); imagealphablending($copy, false); imagecopyresampled($copy, $im, 0,0, 0,0, 5,5, 10, 10); $color = imagecolorat($copy, 3, 3); $fusion = $color; $bot = 255; $points = array( $x, $top, $fusion+$d, (int) (($top+$bot)/2), $x, $bot ); imagefilledpolygon($im, $points, $yellow); ``` Resulted in this output: ``` /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/gd/libgd/gd.c:2849:46: runtime error: signed integer overflow: 4 * 541196321 cannot be represented in type 'int' SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/phpfuzz/WorkSpace/flowfusion/php-src/ext/gd/libgd/gd.c:2849:46 in ``` To reproduce: ``` ./php-src/sapi/cli/php ./test.php ``` Commit: ``` be70f42de7c9ec0e6158ce9ec9d21f0dac24897f ``` Configurations: ``` CC="clang-12" CXX="clang++-12" CFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" CXXFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" ./configure --enable-debug --enable-address-sanitizer --enable-undefined-sanitizer --enable-re2c-cgoto --enable-fpm --enable-litespeed --enable-phpdbg-debug --enable-zts --enable-bcmath --enable-calendar --enable-dba --enable-dl-test --enable-exif --enable-ftp --enable-gd --enable-gd-jis-conv --enable-mbstring --enable-pcntl --enable-shmop --enable-soap --enable-sockets --enable-sysvmsg --enable-zend-test --with-zlib --with-bz2 --with-curl --with-enchant --with-gettext --with-gmp --with-mhash --with-ldap --with-libedit --with-readline --with-snmp --with-sodium --with-xsl --with-zip --with-mysqli --with-pdo-mysql --with-pdo-pgsql --with-pgsql --with-sqlite3 --with-pdo-sqlite --with-webp --with-jpeg --with-freetype --enable-sigchild --with-readline --with-pcre-jit --with-iconv ``` Operating System: ``` Ubuntu 20.04 Host, Docker 0599jiangyc/flowfusion:latest ``` *This report is automatically generated by [FlowFusion](https://github.com/php/flowfusion)* ### PHP Version ```plain be70f42de7c9ec0e6158ce9ec9d21f0dac24897f ``` ### Operating System _No response_