libtiff: fix CVE-2017-17095

Backport fix from gitlab.com/libtiff/libtiff.
nvd.nist.gov does not yet reference this patch.

(From OE-Core rev: f72c8af3f2c1ec9e4d9ffcf0cc6e7fdf572b21b9)

Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-multimedia/libtiff/files/CVE-2017-17095.patch

@@ -0,0 +1,46 @@
+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.
+
+CVE: CVE-2017-17095
+
+Upstream-Status: Backport (unchanged) [gitlab.com/libtiff/libtiff/commit/9171da5...]
+
+Signed-off-by: Joe Slater <joe.slater@windriver.com.
+
+---
+ 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
+@@ -182,8 +182,21 @@ 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++) {
+-- 
+1.7.9.5
+

meta/recipes-multimedia/libtiff/tiff_4.0.9.bb

@@ -12,6 +12,7 @@ SRC_URI = "http://download.osgeo.org/libtiff/tiff-${PV}.tar.gz \
            file://CVE-2018-10963.patch \
            file://CVE-2018-8905.patch \
            file://CVE-2018-7456.patch \
+           file://CVE-2017-17095.patch \
           "
 
 SRC_URI[md5sum] = "54bad211279cc93eb4fca31ba9bfdc79"