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Copied from Debian
From cd82b5267ad4c10eb91e4ee8a716a81362cf851c Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Sun, 21 Dec 2014 18:07:48 +0000
Subject: [PATCH] * libtiff/tif_next.c: check that BitsPerSample = 2. Fixes
http://bugzilla.maptools.org/show_bug.cgi?id=2487 (CVE-2014-8129)
---
ChangeLog | 5 +++++
libtiff/tif_next.c | 17 +++++++++++++++++
2 files changed, 22 insertions(+)
diff --git a/libtiff/tif_next.c b/libtiff/tif_next.c
index a53c716..d834196 100644
--- a/libtiff/tif_next.c
+++ b/libtiff/tif_next.c
@@ -141,10 +141,27 @@ NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
return (0);
}
+static int
+NeXTPreDecode(TIFF* tif, uint16 s)
+{
+ static const char module[] = "NeXTPreDecode";
+ TIFFDirectory *td = &tif->tif_dir;
+ (void)s;
+
+ if( td->td_bitspersample != 2 )
+ {
+ TIFFErrorExt(tif->tif_clientdata, module, "Unsupported BitsPerSample = %d",
+ td->td_bitspersample);
+ return (0);
+ }
+ return (1);
+}
+
int
TIFFInitNeXT(TIFF* tif, int scheme)
{
(void) scheme;
+ tif->tif_predecode = NeXTPreDecode;
tif->tif_decoderow = NeXTDecode;
tif->tif_decodestrip = NeXTDecode;
tif->tif_decodetile = NeXTDecode;
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