main/tiff: security fixes

CVE-2016-10266
CVE-2016-10267
CVE-2016-10268
CVE-2016-10269
CVE-2016-10270

1 files changed, 104 insertions, 0 deletions

diff --git a/main/tiff/CVE-2016-10270.patch b/main/tiff/CVE-2016-10270.patch
new file mode 100644
index 0000000000..4c419decca
--- /dev/null
+++ b/main/tiff/CVE-2016-10270.patch
@@ -0,0 +1,104 @@
+From 9a72a69e035ee70ff5c41541c8c61cd97990d018 Mon Sep 17 00:00:00 2001
+From: erouault <erouault>
+Date: Sat, 3 Dec 2016 11:02:15 +0000
+Subject: [PATCH] * libtiff/tif_dirread.c: modify
+ ChopUpSingleUncompressedStrip() to instanciate compute ntrips as
+ TIFFhowmany_32(td->td_imagelength, rowsperstrip), instead of a logic based on
+ the total size of data. Which is faulty is the total size of data is not
+ sufficient to fill the whole image, and thus results in reading outside of
+ the StripByCounts/StripOffsets arrays when using TIFFReadScanline(). Reported
+ by Agostino Sarubbo. Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2608.
+
+* libtiff/tif_strip.c: revert the change in TIFFNumberOfStrips() done
+for http://bugzilla.maptools.org/show_bug.cgi?id=2587 / CVE-2016-9273 since
+the above change is a better fix that makes it unnecessary.
+
+---
+ libtiff/tif_dirread.c | 22 ++++++++++------------
+ libtiff/tif_strip.c   |  9 ---------
+ 2 files changed, 25 insertions(+), 21 deletions(-)
+
+diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
+index 3eec79c9..570d0c32 100644
+--- a/libtiff/tif_dirread.c
++++ b/libtiff/tif_dirread.c
+@@ -5502,8 +5502,7 @@ ChopUpSingleUncompressedStrip(TIFF* tif)
+ 	uint64 rowblockbytes;
+ 	uint64 stripbytes;
+ 	uint32 strip;
+-	uint64 nstrips64;
+-	uint32 nstrips32;
++	uint32 nstrips;
+ 	uint32 rowsperstrip;
+ 	uint64* newcounts;
+ 	uint64* newoffsets;
+@@ -5534,18 +5533,17 @@ ChopUpSingleUncompressedStrip(TIFF* tif)
+ 	    return;
+ 
+ 	/*
+-	 * never increase the number of strips in an image
++	 * never increase the number of rows per strip
+ 	 */
+ 	if (rowsperstrip >= td->td_rowsperstrip)
+ 		return;
+-	nstrips64 = TIFFhowmany_64(bytecount, stripbytes);
+-	if ((nstrips64==0)||(nstrips64>0xFFFFFFFF)) /* something is wonky, do nothing. */
+-	    return;
+-	nstrips32 = (uint32)nstrips64;
++        nstrips = TIFFhowmany_32(td->td_imagelength, rowsperstrip);
++        if( nstrips == 0 )
++            return;
+ 
+-	newcounts = (uint64*) _TIFFCheckMalloc(tif, nstrips32, sizeof (uint64),
++	newcounts = (uint64*) _TIFFCheckMalloc(tif, nstrips, sizeof (uint64),
+ 				"for chopped \"StripByteCounts\" array");
+-	newoffsets = (uint64*) _TIFFCheckMalloc(tif, nstrips32, sizeof (uint64),
++	newoffsets = (uint64*) _TIFFCheckMalloc(tif, nstrips, sizeof (uint64),
+ 				"for chopped \"StripOffsets\" array");
+ 	if (newcounts == NULL || newoffsets == NULL) {
+ 		/*
+@@ -5562,18 +5560,18 @@ ChopUpSingleUncompressedStrip(TIFF* tif)
+ 	 * Fill the strip information arrays with new bytecounts and offsets
+ 	 * that reflect the broken-up format.
+ 	 */
+-	for (strip = 0; strip < nstrips32; strip++) {
++	for (strip = 0; strip < nstrips; strip++) {
+ 		if (stripbytes > bytecount)
+ 			stripbytes = bytecount;
+ 		newcounts[strip] = stripbytes;
+-		newoffsets[strip] = offset;
++		newoffsets[strip] = stripbytes ? offset : 0;
+ 		offset += stripbytes;
+ 		bytecount -= stripbytes;
+ 	}
+ 	/*
+ 	 * Replace old single strip info with multi-strip info.
+ 	 */
+-	td->td_stripsperimage = td->td_nstrips = nstrips32;
++	td->td_stripsperimage = td->td_nstrips = nstrips;
+ 	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP, rowsperstrip);
+ 
+ 	_TIFFfree(td->td_stripbytecount);
+diff --git a/libtiff/tif_strip.c b/libtiff/tif_strip.c
+index 4c46ecf5..1676e47d 100644
+--- a/libtiff/tif_strip.c
++++ b/libtiff/tif_strip.c
+@@ -63,15 +63,6 @@ TIFFNumberOfStrips(TIFF* tif)
+ 	TIFFDirectory *td = &tif->tif_dir;
+ 	uint32 nstrips;
+ 
+-    /* If the value was already computed and store in td_nstrips, then return it,
+-       since ChopUpSingleUncompressedStrip might have altered and resized the
+-       since the td_stripbytecount and td_stripoffset arrays to the new value
+-       after the initial affectation of td_nstrips = TIFFNumberOfStrips() in
+-       tif_dirread.c ~line 3612.
+-       See http://bugzilla.maptools.org/show_bug.cgi?id=2587 */
+-    if( td->td_nstrips )
+-        return td->td_nstrips;
+-
+ 	nstrips = (td->td_rowsperstrip == (uint32) -1 ? 1 :
+ 	     TIFFhowmany_32(td->td_imagelength, td->td_rowsperstrip));
+ 	if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
+-- 
+2.11.0
+