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42 lines
1.5 KiB
Diff
42 lines
1.5 KiB
Diff
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Fix a integer underflow in tiffcp that led to heap overflows in
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TIFFReverseBits():
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http://bugzilla.maptools.org/show_bug.cgi?id=2598
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2016-12-02 Even Rouault <even.rouault at spatialys.com>
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* tools/tiffcp.c: avoid uint32 underflow in cpDecodedStrips that
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can cause various issues, such as buffer overflows in the library.
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Reported by Agostino Sarubbo.
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Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2598
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/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
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new revision: 1.1174; previous revision: 1.1173
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/cvs/maptools/cvsroot/libtiff/tools/tiffcp.c,v <-- tools/tiffcp.c
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new revision: 1.56; previous revision: 1.55
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Index: libtiff/tools/tiffcp.c
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===================================================================
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RCS file: /cvs/maptools/cvsroot/libtiff/tools/tiffcp.c,v
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retrieving revision 1.55
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retrieving revision 1.56
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diff -u -r1.55 -r1.56
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--- libtiff/tools/tiffcp.c 8 Oct 2016 15:54:57 -0000 1.55
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+++ libtiff/tools/tiffcp.c 2 Dec 2016 22:13:32 -0000 1.56
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@@ -1,4 +1,4 @@
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-/* $Id: tiffcp.c,v 1.55 2016-10-08 15:54:57 erouault Exp $ */
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+/* $Id: tiffcp.c,v 1.56 2016-12-02 22:13:32 erouault Exp $ */
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/*
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* Copyright (c) 1988-1997 Sam Leffler
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@@ -985,7 +985,7 @@
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tstrip_t s, ns = TIFFNumberOfStrips(in);
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uint32 row = 0;
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_TIFFmemset(buf, 0, stripsize);
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- for (s = 0; s < ns; s++) {
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+ for (s = 0; s < ns && row < imagelength; s++) {
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tsize_t cc = (row + rowsperstrip > imagelength) ?
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TIFFVStripSize(in, imagelength - row) : stripsize;
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if (TIFFReadEncodedStrip(in, s, buf, cc) < 0
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