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$NetBSD: patch-al,v 1.1 2006/01/24 21:51:36 tron Exp $
--- libs/xpdf/xpdf/Stream.cc.orig 2004-01-22 01:26:45.000000000 +0000
+++ libs/xpdf/xpdf/Stream.cc 2006-01-24 21:37:45.000000000 +0000
@@ -15,6 +15,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
+#include <limits.h>
#ifndef WIN32
#include <unistd.h>
#endif
@@ -412,13 +413,28 @@
width = widthA;
nComps = nCompsA;
nBits = nBitsA;
+ predLine = NULL;
+ ok = gFalse;
+ if (width <= 0 || nComps <= 0 || nBits <= 0 ||
+ nComps >= INT_MAX/nBits ||
+ width >= INT_MAX/nComps/nBits) {
+ return;
+ }
nVals = width * nComps;
+ if (nVals * nBits + 7 <= 0) {
+ return;
+ }
pixBytes = (nComps * nBits + 7) >> 3;
rowBytes = ((nVals * nBits + 7) >> 3) + pixBytes;
+ if (rowBytes < 0) {
+ return;
+ }
predLine = (Guchar *)gmalloc(rowBytes);
memset(predLine, 0, rowBytes);
predIdx = rowBytes;
+
+ ok = gTrue;
}
StreamPredictor::~StreamPredictor() {
@@ -1012,6 +1028,10 @@
FilterStream(strA) {
if (predictor != 1) {
pred = new StreamPredictor(this, predictor, columns, colors, bits);
+ if (!pred->isOk()) {
+ delete pred;
+ pred = NULL;
+ }
} else {
pred = NULL;
}
@@ -1260,6 +1280,9 @@
endOfLine = endOfLineA;
byteAlign = byteAlignA;
columns = columnsA;
+ if (columns + 3 < 1 || columns + 4 < 1 || columns < 1) {
+ columns = 1;
+ }
rows = rowsA;
endOfBlock = endOfBlockA;
black = blackA;
@@ -2897,6 +2920,10 @@
height = read16();
width = read16();
numComps = str->getChar();
+ if (numComps <= 0 || numComps > 4) {
+ error(getPos(), "Bad number of components in DCT stream", prec);
+ return gFalse;
+ }
if (prec != 8) {
error(getPos(), "Bad DCT precision %d", prec);
return gFalse;
@@ -2923,6 +2950,10 @@
height = read16();
width = read16();
numComps = str->getChar();
+ if (numComps <= 0 || numComps > 4) {
+ error(getPos(), "Bad number of components in DCT stream", prec);
+ return gFalse;
+ }
if (prec != 8) {
error(getPos(), "Bad DCT precision %d", prec);
return gFalse;
@@ -2945,6 +2976,10 @@
length = read16() - 2;
scanInfo.numComps = str->getChar();
+ if (scanInfo.numComps <= 0 || scanInfo.numComps > 4) {
+ error(getPos(), "Bad number of components in DCT stream");
+ return gFalse;
+ }
--length;
if (length != 2 * scanInfo.numComps + 3) {
error(getPos(), "Bad DCT scan info block");
@@ -3019,12 +3054,12 @@
while (length > 0) {
index = str->getChar();
--length;
- if ((index & 0x0f) >= 4) {
+ if ((index & ~0x10) >= 4 || (index & ~0x10) < 0) {
error(getPos(), "Bad DCT Huffman table");
return gFalse;
}
if (index & 0x10) {
- index &= 0x0f;
+ index &= 0x03;
if (index >= numACHuffTables)
numACHuffTables = index+1;
tbl = &acHuffTables[index];
@@ -3255,6 +3290,10 @@
FilterStream(strA) {
if (predictor != 1) {
pred = new StreamPredictor(this, predictor, columns, colors, bits);
+ if (!pred->isOk()) {
+ delete pred;
+ pred = NULL;
+ }
} else {
pred = NULL;
}
|
