commit ccbc956432650734c91acb3fc88837f7b81267ff
Author: Eric S. Raymond <esr@thyrsus.com>
Date:   Wed Feb 21 18:55:00 2024 -0500

    Clean up memory better at end of run (CVE-2021-40633)

CVE: CVE-2021-40633
Upstream: https://sourceforge.net/p/giflib/code/ci/ccbc956432650734c91acb3fc88837f7b81267ff/
Signed-off-by: Thomas Perale <thomas.perale@mind.be>

diff --git a/gif2rgb.c b/gif2rgb.c
index d51226d..fc2e683 100644
--- a/gif2rgb.c
+++ b/gif2rgb.c
@@ -525,6 +525,9 @@ static void GIF2RGB(int NumFiles, char *FileName, bool OneFileFlag,
 	DumpScreen2RGB(OutFileName, OneFileFlag, ColorMap, ScreenBuffer,
 	               GifFile->SWidth, GifFile->SHeight);
 
+	for (i = 0; i < GifFile->SHeight; i++) {
+        	(void)free(ScreenBuffer[i]);
+	}
 	(void)free(ScreenBuffer);
 
 	{