--- kpdf/xpdf/xpdf/JPXStream.cc.orig	2005-12-04 13:01:07.000000000 +0100
+++ kpdf/xpdf/xpdf/JPXStream.cc	2005-12-04 13:15:44.000000000 +0100
@@ -666,7 +666,7 @@
   int segType;
   GBool haveSIZ, haveCOD, haveQCD, haveSOT;
   Guint precinctSize, style;
-  Guint segLen, capabilities, comp, i, j, r;
+  Guint segLen, capabilities, nTiles, comp, i, j, r;
 
   //----- main header
   haveSIZ = haveCOD = haveQCD = haveSOT = gFalse;
@@ -701,6 +701,13 @@
 	            / img.xTileSize;
       img.nYTiles = (img.ySize - img.yTileOffset + img.yTileSize - 1)
 	            / img.yTileSize;
+      nTiles = img.nXTiles * img.nYTiles;
+      // check for overflow before allocating memory
+      if (nTiles == 0 || nTiles / img.nXTiles != img.nYTiles) {
+	error(getPos(), "Bad tile count in JPX SIZ marker segment");
+	return gFalse;
+      }
+      img.tiles = (JPXTile *)gmalloc(nTiles * sizeof(JPXTile));
       img.tiles = (JPXTile *)gmalloc(img.nXTiles * img.nYTiles *
 				     sizeof(JPXTile));
       for (i = 0; i < img.nXTiles * img.nYTiles; ++i) {
--- kpdf/xpdf/xpdf/Stream.h.orig	2005-12-04 13:16:13.000000000 +0100
+++ kpdf/xpdf/xpdf/Stream.h	2005-12-04 13:21:52.000000000 +0100
@@ -233,6 +233,8 @@
 
   ~StreamPredictor();
 
+  GBool isOk() { return ok; }
+
   int lookChar();
   int getChar();
 
@@ -250,6 +252,7 @@
   int rowBytes;			// bytes per line
   Guchar *predLine;		// line buffer
   int predIdx;			// current index in predLine
+  GBool ok;
 };
 
 //------------------------------------------------------------------------
--- kpdf/xpdf/xpdf/Stream.cc.orig	2005-12-04 13:23:51.000000000 +0100
+++ kpdf/xpdf/xpdf/Stream.cc	2005-12-04 13:36:34.000000000 +0100
@@ -408,18 +408,34 @@
 
 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() {
@@ -1013,6 +1029,10 @@
     FilterStream(strA) {
   if (predictor != 1) {
     pred = new StreamPredictor(this, predictor, columns, colors, bits);
+    if (!pred->isOk()) {
+      delete pred;
+      pred = NULL;
+    }
   } else {
     pred = NULL;
   }
@@ -2899,6 +2919,14 @@
   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;
@@ -3258,6 +3286,10 @@
     FilterStream(strA) {
   if (predictor != 1) {
     pred = new StreamPredictor(this, predictor, columns, colors, bits);
+    if (!pred->isOk()) {
+      delete pred;
+      pred = NULL;
+    }
   } else {
     pred = NULL;
   }