https://crbug.com/923647

commit ae0bed1fe530a82faf2e9ea1775109dbf301a971
Merge: 933784a1 0c74a9f4
Author: Even Rouault <even.rouault@spatialys.com>
Date:   Sat Feb 2 14:46:05 2019 +0000

    Merge branch 'master' into 'master'

    Fix for simple memory leak that was assigned CVE-2019-6128.

    See merge request libtiff/libtiff!50

diff --git a/tools/pal2rgb.c b/tools/pal2rgb.c
index 01d8502ecf7a8a7f015e49ca9378a1a741cbc06b..9492f1cf1212177bf7e97d307757d0977c898e90 100644
--- a/tools/pal2rgb.c
+++ b/tools/pal2rgb.c
@@ -118,12 +118,14 @@ main(int argc, char* argv[])
 	    shortv != PHOTOMETRIC_PALETTE) {
 		fprintf(stderr, "%s: Expecting a palette image.\n",
 		    argv[optind]);
+		(void) TIFFClose(in);
 		return (-1);
 	}
 	if (!TIFFGetField(in, TIFFTAG_COLORMAP, &rmap, &gmap, &bmap)) {
 		fprintf(stderr,
 		    "%s: No colormap (not a valid palette image).\n",
 		    argv[optind]);
+		(void) TIFFClose(in);
 		return (-1);
 	}
 	bitspersample = 0;
@@ -131,11 +133,14 @@ main(int argc, char* argv[])
 	if (bitspersample != 8) {
 		fprintf(stderr, "%s: Sorry, can only handle 8-bit images.\n",
 		    argv[optind]);
+		(void) TIFFClose(in);
 		return (-1);
 	}
 	out = TIFFOpen(argv[optind+1], "w");
-	if (out == NULL)
+	if (out == NULL) {
+		(void) TIFFClose(in);
 		return (-2);
+	}
 	cpTags(in, out);
 	TIFFGetField(in, TIFFTAG_IMAGEWIDTH, &imagewidth);
 	TIFFGetField(in, TIFFTAG_IMAGELENGTH, &imagelength);