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Fix invalid read in t2p_writeproc():
http://bugzilla.maptools.org/show_bug.cgi?id=2639
2016-12-20 Even Rouault <even.rouault at spatialys.com>
* tools/tiff2pdf.c: avoid potential invalid memory read in
t2p_writeproc.
Fixes http://bugzilla.maptools.org/show_bug.cgi?id=2639
/cvs/maptools/cvsroot/libtiff/ChangeLog,v <-- ChangeLog
new revision: 1.1198; previous revision: 1.1197
/cvs/maptools/cvsroot/libtiff/tools/tiff2pdf.c,v <-- tools/tiff2pdf.c
new revision: 1.100; previous revision: 1.99
Index: libtiff/tools/tiff2pdf.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/tools/tiff2pdf.c,v
retrieving revision 1.99
retrieving revision 1.100
diff -u -r1.99 -r1.100
--- libtiff/tools/tiff2pdf.c 20 Dec 2016 17:13:26 -0000 1.99
+++ libtiff/tools/tiff2pdf.c 20 Dec 2016 17:24:35 -0000 1.100
@@ -2896,6 +2896,7 @@
}
if(TIFFGetField(input, TIFFTAG_JPEGTABLES, &count, &jpt) != 0) {
if (count >= 4) {
+ int retTIFFReadRawTile;
/* Ignore EOI marker of JpegTables */
_TIFFmemcpy(buffer, jpt, count - 2);
bufferoffset += count - 2;
@@ -2903,22 +2904,23 @@
table_end[0] = buffer[bufferoffset-2];
table_end[1] = buffer[bufferoffset-1];
xuint32 = bufferoffset;
- bufferoffset -= 2;
- bufferoffset += TIFFReadRawTile(
+ bufferoffset -= 2;
+ retTIFFReadRawTile= TIFFReadRawTile(
input,
tile,
(tdata_t) &(((unsigned char*)buffer)[bufferoffset]),
-1);
+ if( retTIFFReadRawTile < 0 )
+ {
+ _TIFFfree(buffer);
+ t2p->t2p_error = T2P_ERR_ERROR;
+ return(0);
+ }
+ bufferoffset += retTIFFReadRawTile;
/* Overwrite SOI marker of image scan with previously */
/* saved end of JpegTables */
buffer[xuint32-2]=table_end[0];
buffer[xuint32-1]=table_end[1];
- } else {
- bufferoffset += TIFFReadRawTile(
- input,
- tile,
- (tdata_t) &(((unsigned char*)buffer)[bufferoffset]),
- -1);
}
}
t2pWriteFile(output, (tdata_t) buffer, bufferoffset);
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