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Fix for CVE-2017-10168
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Backported for 5.4 without test and binary patch
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From f1b2afc9d9e77edf41804f5dfc4e2069d8a12975 Mon Sep 17 00:00:00 2001
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From: "Christoph M. Becker" <cmbecker69@gmx.de>
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Date: Tue, 16 Aug 2016 18:23:36 +0200
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Subject: [PATCH] Fix #73868: DOS vulnerability in gdImageCreateFromGd2Ctx()
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We must not pretend that there are image data if there are none. Instead
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we fail reading the image file gracefully.
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(cherry picked from commit cdb648dc4115ce0722f3cc75e6a65115fc0e56ab)
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---
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ext/gd/libgd/gd_gd2.c | 8 ++++++--
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ext/gd/tests/bug73868.gd2 | Bin 0 -> 1050 bytes
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ext/gd/tests/bug73868.phpt | 18 ++++++++++++++++++
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3 files changed, 24 insertions(+), 2 deletions(-)
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create mode 100644 ext/gd/tests/bug73868.gd2
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create mode 100644 ext/gd/tests/bug73868.phpt
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diff --git a/ext/gd/libgd/gd_gd2.c b/ext/gd/libgd/gd_gd2.c
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index d06f328..196b785 100644
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--- a/ext/gd/libgd/gd_gd2.c
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+++ b/ext/gd/libgd/gd_gd2.c
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@@ -334,12 +334,16 @@ gdImagePtr gdImageCreateFromGd2Ctx (gdIOCtxPtr in)
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for (x = xlo; x < xhi; x++) {
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if (im->trueColor) {
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if (!gdGetInt(&im->tpixels[y][x], in)) {
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- im->tpixels[y][x] = 0;
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+ php_gd_error("gd2: EOF while reading\n");
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+ gdImageDestroy(im);
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+ return NULL;
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}
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} else {
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int ch;
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if (!gdGetByte(&ch, in)) {
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- ch = 0;
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+ php_gd_error("gd2: EOF while reading\n");
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+ gdImageDestroy(im);
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+ return NULL;
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}
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im->pixels[y][x] = ch;
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}
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--
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2.1.4
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