132 lines
4.9 KiB
Diff
132 lines
4.9 KiB
Diff
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Fix heap-based buffer overflow in _TIFFmemcpy():
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http://bugzilla.maptools.org/show_bug.cgi?id=2604
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2016-12-03 Even Rouault <even.rouault at spatialys.com>
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* libtiff/tif_pixarlog.c, libtiff/tif_luv.c: fix heap-based buffer
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overflow on generation of PixarLog / LUV compressed files, with
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ColorMap, TransferFunction attached and nasty plays with bitspersample.
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The fix for LUV has not been tested, but suffers from the same kind
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of issue of PixarLog.
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Reported by Agostino Sarubbo.
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Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2604
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/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
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new revision: 1.1175; previous revision: 1.1174
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/cvs/maptools/cvsroot/libtiff/libtiff/tif_luv.c,v <-- libtiff/tif_luv.c
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new revision: 1.44; previous revision: 1.43
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/cvs/maptools/cvsroot/libtiff/libtiff/tif_pixarlog.c,v <--
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libtiff/tif_pixarlog.c
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new revision: 1.49; previous revision: 1.48
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Index: libtiff/libtiff/tif_luv.c
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===================================================================
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RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_luv.c,v
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retrieving revision 1.43
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retrieving revision 1.44
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diff -u -r1.43 -r1.44
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--- libtiff/libtiff/tif_luv.c 4 Sep 2016 21:32:56 -0000 1.43
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+++ libtiff/libtiff/tif_luv.c 2 Dec 2016 23:05:51 -0000 1.44
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@@ -1,4 +1,4 @@
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-/* $Id: tif_luv.c,v 1.43 2016-09-04 21:32:56 erouault Exp $ */
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+/* $Id: tif_luv.c,v 1.44 2016-12-02 23:05:51 erouault Exp $ */
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/*
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* Copyright (c) 1997 Greg Ward Larson
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@@ -158,6 +158,7 @@
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typedef struct logLuvState LogLuvState;
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struct logLuvState {
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+ int encoder_state; /* 1 if encoder correctly initialized */
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int user_datafmt; /* user data format */
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int encode_meth; /* encoding method */
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int pixel_size; /* bytes per pixel */
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@@ -1552,6 +1553,7 @@
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td->td_photometric, "must be either LogLUV or LogL");
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break;
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}
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+ sp->encoder_state = 1;
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return (1);
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notsupported:
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TIFFErrorExt(tif->tif_clientdata, module,
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@@ -1563,19 +1565,27 @@
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static void
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LogLuvClose(TIFF* tif)
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{
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+ LogLuvState* sp = (LogLuvState*) tif->tif_data;
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TIFFDirectory *td = &tif->tif_dir;
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+ assert(sp != 0);
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/*
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* For consistency, we always want to write out the same
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* bitspersample and sampleformat for our TIFF file,
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* regardless of the data format being used by the application.
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* Since this routine is called after tags have been set but
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* before they have been recorded in the file, we reset them here.
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+ * Note: this is really a nasty approach. See PixarLogClose
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*/
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- td->td_samplesperpixel =
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- (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
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- td->td_bitspersample = 16;
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- td->td_sampleformat = SAMPLEFORMAT_INT;
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+ if( sp->encoder_state )
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+ {
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+ /* See PixarLogClose. Might avoid issues with tags whose size depends
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+ * on those below, but not completely sure this is enough. */
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+ td->td_samplesperpixel =
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+ (td->td_photometric == PHOTOMETRIC_LOGL) ? 1 : 3;
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+ td->td_bitspersample = 16;
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+ td->td_sampleformat = SAMPLEFORMAT_INT;
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+ }
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}
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static void
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Index: libtiff/libtiff/tif_pixarlog.c
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===================================================================
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RCS file: /cvs/maptools/cvsroot/libtiff/libtiff/tif_pixarlog.c,v
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retrieving revision 1.48
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retrieving revision 1.49
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diff -u -r1.48 -r1.49
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--- libtiff/libtiff/tif_pixarlog.c 23 Sep 2016 22:12:18 -0000 1.48
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+++ libtiff/libtiff/tif_pixarlog.c 2 Dec 2016 23:05:51 -0000 1.49
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@@ -1,4 +1,4 @@
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-/* $Id: tif_pixarlog.c,v 1.48 2016-09-23 22:12:18 erouault Exp $ */
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+/* $Id: tif_pixarlog.c,v 1.49 2016-12-02 23:05:51 erouault Exp $ */
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/*
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* Copyright (c) 1996-1997 Sam Leffler
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@@ -1233,8 +1233,10 @@
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static void
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PixarLogClose(TIFF* tif)
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{
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+ PixarLogState* sp = (PixarLogState*) tif->tif_data;
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TIFFDirectory *td = &tif->tif_dir;
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+ assert(sp != 0);
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/* In a really sneaky (and really incorrect, and untruthful, and
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* troublesome, and error-prone) maneuver that completely goes against
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* the spirit of TIFF, and breaks TIFF, on close, we covertly
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@@ -1243,8 +1245,19 @@
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* readers that don't know about PixarLog, or how to set
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* the PIXARLOGDATFMT pseudo-tag.
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*/
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- td->td_bitspersample = 8;
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- td->td_sampleformat = SAMPLEFORMAT_UINT;
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+
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+ if (sp->state&PLSTATE_INIT) {
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+ /* We test the state to avoid an issue such as in
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+ * http://bugzilla.maptools.org/show_bug.cgi?id=2604
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+ * What appends in that case is that the bitspersample is 1 and
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+ * a TransferFunction is set. The size of the TransferFunction
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+ * depends on 1<<bitspersample. So if we increase it, an access
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+ * out of the buffer will happen at directory flushing.
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+ * Another option would be to clear those targs.
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+ */
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+ td->td_bitspersample = 8;
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+ td->td_sampleformat = SAMPLEFORMAT_UINT;
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+ }
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}
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static void
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