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From 98b2e94e62d873acbcc6d968f1f97af9749fe021 Mon Sep 17 00:00:00 2001
From: Ondrej Dubaj <odubaj@redhat.com>
Date: Tue, 4 Jun 2019 10:54:45 +0200
Subject: [PATCH] heap based buffer overflow in
gd_color_match.c:gdImageColorMatch() in libgd as used in imagecolormatch()
---
src/gd_color_match.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/gd_color_match.c b/src/gd_color_match.c
index f0842b6..a94a841 100755
--- a/src/gd_color_match.c
+++ b/src/gd_color_match.c
@@ -31,8 +31,8 @@ BGD_DECLARE(int) gdImageColorMatch (gdImagePtr im1, gdImagePtr im2)
return -4; /* At least 1 color must be allocated */
}
- buf = (unsigned long *)gdMalloc(sizeof(unsigned long) * 5 * im2->colorsTotal);
- memset (buf, 0, sizeof(unsigned long) * 5 * im2->colorsTotal );
+ buf = (unsigned long *)gdMalloc(sizeof(unsigned long) * 5 * gdMaxColors);
+ memset (buf, 0, sizeof(unsigned long) * 5 * gdMaxColors );
for (x=0; x < im1->sx; x++) {
for( y=0; y<im1->sy; y++ ) {
--
2.17.1
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