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Fix CVE-2016-5652 (buffer overflow in t2p_readwrite_pdf_image_tile()).
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-5652
Patches exfiltrated from upstream CVS repo with:
cvs diff -u -r 1.92 -r 1.94 tools/tiff2pdf.c
Index: tools/tiff2pdf.c
===================================================================
RCS file: /cvs/maptools/cvsroot/libtiff/tools/tiff2pdf.c,v
retrieving revision 1.92
retrieving revision 1.94
diff -u -r1.92 -r1.94
--- a/tools/tiff2pdf.c 23 Sep 2016 22:12:18 -0000 1.92
+++ b/tools/tiff2pdf.c 9 Oct 2016 11:03:36 -0000 1.94
@@ -2887,21 +2887,24 @@
return(0);
}
if(TIFFGetField(input, TIFFTAG_JPEGTABLES, &count, &jpt) != 0) {
- if (count > 0) {
- _TIFFmemcpy(buffer, jpt, count);
+ if (count >= 4) {
+ /* Ignore EOI marker of JpegTables */
+ _TIFFmemcpy(buffer, jpt, count - 2);
bufferoffset += count - 2;
+ /* Store last 2 bytes of the JpegTables */
table_end[0] = buffer[bufferoffset-2];
table_end[1] = buffer[bufferoffset-1];
- }
- if (count > 0) {
xuint32 = bufferoffset;
+ bufferoffset -= 2;
bufferoffset += TIFFReadRawTile(
input,
tile,
- (tdata_t) &(((unsigned char*)buffer)[bufferoffset-2]),
+ (tdata_t) &(((unsigned char*)buffer)[bufferoffset]),
-1);
- buffer[xuint32-2]=table_end[0];
- buffer[xuint32-1]=table_end[1];
+ /* 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,
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