$OpenBSD: patch-xpdf_Stream_cc,v 1.1 2005/12/07 10:51:40 bernd Exp $
--- xpdf/Stream.cc.orig	Mon May 17 21:37:57 2004
+++ xpdf/Stream.cc	Tue Dec  6 22:42:37 2005
@@ -407,18 +407,33 @@ void ImageStream::skipLine() {
 
 StreamPredictor::StreamPredictor(Stream *strA, int predictorA,
 				 int widthA, int nCompsA, int nBitsA) {
+  int totalBits;
+
   str = strA;
   predictor = predictorA;
   width = widthA;
   nComps = nCompsA;
   nBits = nBitsA;
+  predLine = NULL;
+  ok = gFalse;
 
   nVals = width * nComps;
+  totalBits = nVals * nBits;
+  if (totalBits == 0 ||
+      (totalBits / nBits) / nComps != width ||
+      totalBits + 7 < 0) {
+    return;
+  }
   pixBytes = (nComps * nBits + 7) >> 3;
-  rowBytes = ((nVals * nBits + 7) >> 3) + pixBytes;
+  rowBytes = ((totalBits + 7) >> 3) + pixBytes;
+  if (rowBytes < 0) {
+    return;
+  }
   predLine = (Guchar *)gmalloc(rowBytes);
   memset(predLine, 0, rowBytes);
   predIdx = rowBytes;
+
+  ok = gTrue;
 }
 
 StreamPredictor::~StreamPredictor() {
@@ -1012,6 +1027,10 @@ LZWStream::LZWStream(Stream *strA, int p
     FilterStream(strA) {
   if (predictor != 1) {
     pred = new StreamPredictor(this, predictor, columns, colors, bits);
+    if (!pred->isOk()) {
+      delete pred;
+      pred = NULL;
+    }
   } else {
     pred = NULL;
   }
@@ -2897,6 +2916,14 @@ GBool DCTStream::readBaselineSOF() {
   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 (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;
@@ -3255,6 +3282,10 @@ FlateStream::FlateStream(Stream *strA, i
     FilterStream(strA) {
   if (predictor != 1) {
     pred = new StreamPredictor(this, predictor, columns, colors, bits);
+    if (!pred->isOk()) {
+      delete pred;
+      pred = NULL;
+    }
   } else {
     pred = NULL;
   }