Origin: https://src.fedoraproject.org/rpms/freeimage/blob/f39/f/CVE-2021-40266.patch
diff -rupN --no-dereference freeimage-svn-r1909-FreeImage-trunk/Source/FreeImage/PluginTIFF.cpp freeimage-svn-r1909-FreeImage-trunk-new/Source/FreeImage/PluginTIFF.cpp
--- freeimage-svn-r1909-FreeImage-trunk/Source/FreeImage/PluginTIFF.cpp	2023-09-28 19:34:47.501011966 +0200
+++ freeimage-svn-r1909-FreeImage-trunk-new/Source/FreeImage/PluginTIFF.cpp	2023-09-28 19:34:47.610010879 +0200
@@ -357,6 +357,10 @@ static void
 ReadPalette(TIFF *tiff, uint16 photometric, uint16 bitspersample, FIBITMAP *dib) {
 	RGBQUAD *pal = FreeImage_GetPalette(dib);
 
+	if (!pal) {
+	  return;
+	}
+
 	switch(photometric) {
 		case PHOTOMETRIC_MINISBLACK:	// bitmap and greyscale image types
 		case PHOTOMETRIC_MINISWHITE: