gentoo-overlay/media-libs/tiff/files/tiff-4.0.7-bug2597.patch

From 5ad5e64f8530a827482645986f5bb4e4613d0aa7 Mon Sep 17 00:00:00 2001
From: Even Rouault <even.rouault@spatialys.com>
Date: Sat, 3 Dec 2016 14:42:40 +0000
Subject: [PATCH] * tools/tiffcp.c: avoid potential division by zero is
 BitsPerSamples tag is missing. Reported by Agostino sarubbo. Fixes
 http://bugzilla.maptools.org/show_bug.cgi?id=2597

---
 ChangeLog      |  7 +++++++
 tools/tiffcp.c | 10 ++++++++--
 2 files changed, 15 insertions(+), 2 deletions(-)

diff --git a/tools/tiffcp.c b/tools/tiffcp.c
index 6dfb9a91bfa9..c8e48c3c2bb3 100644
--- a/tools/tiffcp.c
+++ b/tools/tiffcp.c
@@ -1378,7 +1378,7 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	uint8* bufp = (uint8*) buf;
 	uint32 tw, tl;
 	uint32 row;
-	uint16 bps, bytes_per_sample;
+	uint16 bps = 0, bytes_per_sample;
 
 	tilebuf = _TIFFmalloc(tilesize);
 	if (tilebuf == 0)
@@ -1387,6 +1387,12 @@ DECLAREreadFunc(readSeparateTilesIntoBuffer)
 	(void) TIFFGetField(in, TIFFTAG_TILEWIDTH, &tw);
 	(void) TIFFGetField(in, TIFFTAG_TILELENGTH, &tl);
 	(void) TIFFGetField(in, TIFFTAG_BITSPERSAMPLE, &bps);
+        if( bps == 0 )
+        {
+            TIFFError(TIFFFileName(in), "Error, cannot read BitsPerSample");
+            status = 0;
+            goto done;
+        }
 	assert( bps % 8 == 0 );
 	bytes_per_sample = bps/8;
 
-- 
2.12.0