Apply security fixes to libtiff that are not in 4.0.6.

third_party/libtiff/0004-CVE-2015-8784.patch

+From b18012dae552f85dcc5c57d3bf4e997a15b1cc1c Mon Sep 17 00:00:00 2001
+From: erouault <erouault>
+Date: Sun, 27 Dec 2015 16:55:20 +0000
+Subject: [PATCH] * libtiff/tif_next.c: fix potential out-of-bound write in
+ NeXTDecode() triggered by http://lcamtuf.coredump.cx/afl/vulns/libtiff5.tif
+ (bugzilla #2508)
+
+---
+ ChangeLog          |  6 ++++++
+ libtiff/tif_next.c | 10 ++++++++--
+ 2 files changed, 14 insertions(+), 2 deletions(-)
+
+diff --git a/libtiff/tif_next.c b/libtiff/tif_next.c
+index dd669cc..0a5b635 100644
+--- a/libtiff/tif_next.c
++++ b/libtiff/tif_next.c
+@@ -37,7 +37,7 @@
+        case 0: op[0]  = (unsigned char) ((v) << 6); break;     \
+        case 1: op[0] |= (v) << 4; break;       \
+        case 2: op[0] |= (v) << 2; break;       \
+-       case 3: *op++ |= (v);      break;       \
++       case 3: *op++ |= (v);      op_offset++; break;  \
+        }                                       \
+ }
+ 
+@@ -106,6 +106,7 @@ NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
+                        uint32 imagewidth = tif->tif_dir.td_imagewidth;
+             if( isTiled(tif) )
+                 imagewidth = tif->tif_dir.td_tilewidth;
++            tmsize_t op_offset = 0;
+ 
+                        /*
+                         * The scanline is composed of a sequence of constant
+@@ -122,10 +123,15 @@ NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
+                                 * bounds, potentially resulting in a security
+                                 * issue.
+                                 */
+-                               while (n-- > 0 && npixels < imagewidth)
++                               while (n-- > 0 && npixels < imagewidth && op_offset < scanline)
+                                        SETPIXEL(op, grey);
+                                if (npixels >= imagewidth)
+                                        break;
++                if (op_offset >= scanline ) {
++                    TIFFErrorExt(tif->tif_clientdata, module, "Invalid data for scanline %ld",
++                        (long) tif->tif_row);
++                    return (0);
++                }
+                                if (cc == 0)
+                                        goto bad;
+                                n = *bp++, cc--;