$NetBSD: patch-CVE-2025-31344,v 1.1 2025/05/04 11:19:20 nia Exp $

Fix CVE-2025-31344

https://github.com/OpenMandrivaAssociation/giflib/blob/master/giflib-5.2.2-cve-2025-31344.patch
https://security-tracker.debian.org/tracker/CVE-2025-31344

--- gif2rgb.c.orig	2024-02-19 03:01:28.000000000 +0000
+++ gif2rgb.c
@@ -329,6 +329,11 @@ static void DumpScreen2RGB(char *FileNam
 			GifRow = ScreenBuffer[i];
 			GifQprintf("\b\b\b\b%-4d", ScreenHeight - i);
 			for (j = 0; j < ScreenWidth; j++) {
+				/* Check if color is within color palete */
+				if (GifRow[j] >= ColorMap->ColorCount) {
+					GIF_EXIT(GifErrorString(
+					    D_GIF_ERR_IMAGE_DEFECT));
+				}
 				ColorMapEntry = &ColorMap->Colors[GifRow[j]];
 				Buffers[0][j] = ColorMapEntry->Red;
 				Buffers[1][j] = ColorMapEntry->Green;