tiff: Fix CVE-2017-17095

Fedora does not have a fix for this but Debian does. Took fix from there.

There are two more CVEs as reported by uscan but I can't seem to find
patches for those.

Signed-off-by: Rosen Penev <rosenp@gmail.com>

libs/tiff/Makefile

@@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
 
 PKG_NAME:=tiff
 PKG_VERSION:=4.0.9
-PKG_RELEASE:=4
+PKG_RELEASE:=5
 
 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
 PKG_SOURCE_URL:=https://download.osgeo.org/libtiff

libs/tiff/patches/027-CVE-2017-17095.patch

@@ -0,0 +1,40 @@
+From 9171da596c88e6a2dadcab4a3a89dddd6e1b4655 Mon Sep 17 00:00:00 2001
+From: Nathan Baker <elitebadger@gmail.com>
+Date: Thu, 25 Jan 2018 21:28:15 +0000
+Subject: [PATCH] Add workaround to pal2rgb buffer overflow.
+
+---
+ tools/pal2rgb.c | 17 +++++++++++++++--
+ 1 file changed, 15 insertions(+), 2 deletions(-)
+
+diff --git a/tools/pal2rgb.c b/tools/pal2rgb.c
+index 0423598..01fcf94 100644
+--- a/tools/pal2rgb.c
++++ b/tools/pal2rgb.c
+@@ -184,8 +184,21 @@ main(int argc, char* argv[])
+ 	{ unsigned char *ibuf, *obuf;
+ 	  register unsigned char* pp;
+ 	  register uint32 x;
+-	  ibuf = (unsigned char*)_TIFFmalloc(TIFFScanlineSize(in));
+-	  obuf = (unsigned char*)_TIFFmalloc(TIFFScanlineSize(out));
++	  tmsize_t tss_in = TIFFScanlineSize(in);
++	  tmsize_t tss_out = TIFFScanlineSize(out);
++	  if (tss_out / tss_in < 3) {
++		/*
++		 * BUG 2750: The following code does not know about chroma
++		 * subsampling of JPEG data. It assumes that the output buffer is 3x
++		 * the length of the input buffer due to exploding the palette into
++		 * RGB tuples. If this assumption is incorrect, it could lead to a
++		 * buffer overflow. Go ahead and fail now to prevent that.
++		 */
++		fprintf(stderr, "Could not determine correct image size for output. Exiting.\n");
++		return -1;
++      }
++	  ibuf = (unsigned char*)_TIFFmalloc(tss_in);
++	  obuf = (unsigned char*)_TIFFmalloc(tss_out);
+ 	  switch (config) {
+ 	  case PLANARCONFIG_CONTIG:
+ 		for (row = 0; row < imagelength; row++) {
+--
+libgit2 0.27.0
+