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Fix GH-17703: imagescale both width and heigh set with negative values. #17708

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Fix GH-17703: imagescale both width and heigh set with negative values. #17708

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5 changes: 5 additions & 0 deletions ext/gd/gd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -3981,6 +3981,11 @@ PHP_FUNCTION(imagescale)

im = php_gd_libgdimageptr_from_zval_p(IM);

if (tmp_h < 0 && tmp_w < 0) {
zend_value_error("Argument #2 ($width) and argument #3 ($height) cannot be both negative");
RETURN_THROWS();
}

if (tmp_h < 0 || tmp_w < 0) {
/* preserve ratio */
long src_x, src_y;
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17 changes: 17 additions & 0 deletions ext/gd/tests/gh17703.phpt
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@@ -0,0 +1,17 @@
--TEST--
GH-17703 both width and height value being negative triggers ValueError on width.
--EXTENSIONS--
gd
--FILE--
<?php

$img = imagecreatetruecolor ( 256, 1);

try {
imagescale($img, -1, -1, 0);
} catch (\ValueError $e) {
echo $e->getMessage();
}
?>
--EXPECT--
Argument #2 ($width) and argument #3 ($height) cannot be both negative