Copied from Debian

From 0782c759084daaf9e4de7ee6be7543081823455e Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Sun, 21 Dec 2014 20:58:29 +0000
Subject: [PATCH] * tools/tiff2bw.c: when Photometric=RGB, the utility only
 works if SamplesPerPixel = 3. Enforce that
 http://bugzilla.maptools.org/show_bug.cgi?id=2485 (CVE-2014-8127)

---
 ChangeLog       | 6 ++++++
 tools/tiff2bw.c | 5 +++++
 2 files changed, 11 insertions(+)

diff --git a/tools/tiff2bw.c b/tools/tiff2bw.c
index 22467cd..94b8e31 100644
--- a/tools/tiff2bw.c
+++ b/tools/tiff2bw.c
@@ -171,6 +171,11 @@ main(int argc, char* argv[])
 		    argv[optind], samplesperpixel);
 		return (-1);
 	}
+	if( photometric == PHOTOMETRIC_RGB && samplesperpixel != 3) {
+		fprintf(stderr, "%s: Bad samples/pixel %u for PHOTOMETRIC_RGB.\n",
+		    argv[optind], samplesperpixel);
+		return (-1);
+	}
 	TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bitspersample);
 	if (bitspersample != 8) {
 		fprintf(stderr,
