--- /dev/null
+From 6e7042c61e300cf9971c645c79d05de974b24308 Mon Sep 17 00:00:00 2001
+From: erouault <erouault>
+Date: Sat, 3 Dec 2016 11:02:15 +0000
+Subject: [PATCH 3/4] * 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.
+
+Upstream-Status: Backport
+
+CVE: CVE-2016-10270
+Signed-off-by: Rajkumar Veer <rveer@mvista.com>
+---
+ ChangeLog | 15 +++++++++++++++
+ libtiff/tif_dirread.c | 22 ++++++++++------------
+ libtiff/tif_strip.c | 9 ---------
+ 3 files changed, 25 insertions(+), 21 deletions(-)
+
+diff --git a/ChangeLog b/ChangeLog
+index 0a2c2a7..6e30e41 100644
+--- a/ChangeLog
++++ b/ChangeLog
+@@ -1,5 +1,20 @@
+ 2016-12-03 Even Rouault <even.rouault at spatialys.com>
+
++ * 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.
++
++2016-12-03 Even Rouault <even.rouault at spatialys.com>
++
+ * libtiff/tif_pixarlog.c, libtiff/tif_luv.c: fix heap-based buffer
+ overflow on generation of PixarLog / LUV compressed files, with
+ ColorMap, TransferFunction attached and nasty plays with bitspersample.
+diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
+index 3eec79c..570d0c3 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 4c46ecf..1676e47 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)
+--
+1.9.1
+
