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Fix GH-22121: double-free in gdImageSetStyle() after overflow early return #71

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Fix GH-22121: double-free in gdImageSetStyle() after overflow early return #71

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6 changes: 3 additions & 3 deletions ext/gd/libgd/gd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2879,12 +2879,12 @@ void gdImageFilledPolygon (gdImagePtr im, gdPointPtr p, int n, int c)

void gdImageSetStyle (gdImagePtr im, int *style, int noOfPixels)
{
if (im->style) {
gdFree(im->style);
}
if (overflow2(sizeof (int), noOfPixels)) {
return;
}
if (im->style) {
gdFree(im->style);
}
im->style = (int *) gdMalloc(sizeof(int) * noOfPixels);
memcpy(im->style, style, sizeof(int) * noOfPixels);
im->styleLength = noOfPixels;
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23 changes: 23 additions & 0 deletions ext/gd/tests/gh22121.phpt
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
--TEST--
GH-22121 (Double free in gdImageSetStyle() after overflow-triggered early return)
--EXTENSIONS--
gd
--INI--
memory_limit=-1
--SKIPIF--
<?php
if (!getenv('RUN_RESOURCE_HEAVY_TESTS')) die('skip resource-heavy test');
if (PHP_INT_SIZE < 8) die('skip 64-bit only (allocates ~10 GiB)');
?>
--FILE--
<?php
$im = imagecreatetruecolor(1, 1);
imagesetstyle($im, [0]);
imagesetstyle($im, array_fill(0, 536870912, 0));
unset($im);
echo "no double free\n";
?>
--EXPECTF--
Warning: imagesetstyle(): Product of memory allocation multiplication would exceed INT_MAX, failing operation gracefully
in %s on line %d
no double free
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