Fix a potential resize bug and apply xpdf 3.02pl4 and 3.02pl5 security patches.

This partially resolves bug report 1175.
(cherry picked from commit 561d1d6802dd50ddc9f441442cc2c351dd2759d6)

8 files changed, 77 insertions, 17 deletions

diff --git a/kpdf/xpdf/fofi/FoFiType1.cc b/kpdf/xpdf/fofi/FoFiType1.cc
index efad5ee4..88b35ecc 100644
--- a/kpdf/xpdf/fofi/FoFiType1.cc
+++ b/kpdf/xpdf/fofi/FoFiType1.cc
@@ -224,7 +224,7 @@ void FoFiType1::parse() {
 		code = code * 8 + (*p2 - '0');
 	      }
 	    }
-	    if (code < 256) {
+	    if (code >= 0 && code < 256) {
 	      for (p = p2; *p == ' ' || *p == '\t'; ++p) ;
 	      if (*p == '/') {
 		++p;
@@ -235,9 +235,14 @@ void FoFiType1::parse() {
 	    }
 	  }
 	} else {
-	  if (strtok(buf, " \t") &&
-	      (p = strtok(NULL, " \t\n\r")) && !strcmp(p, "def")) {
-	    break;
+	  p = strtok(buf, " \t\n\r");
+	  if (p)
+	  {
+	    if (!strcmp(p, "def")) break;
+	    if (!strcmp(p, "readonly")) break;
+	    // the spec does not says this but i'm mantaining old xpdf behaviour that accepts "foo def" as end of the encoding array
+	    p = strtok(buf, " \t\n\r");
+	    if (p && !strcmp(p, "def")) break;
 	  }
 	}
       }
diff --git a/kpdf/xpdf/splash/Splash.cc b/kpdf/xpdf/splash/Splash.cc
index 30179fda..2b91e4e7 100644
--- a/kpdf/xpdf/splash/Splash.cc
+++ b/kpdf/xpdf/splash/Splash.cc
@@ -12,6 +12,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <limits.h>
 #include "gmem.h"
 #include "SplashErrorCodes.h"
 #include "SplashMath.h"
@@ -1501,6 +1502,11 @@ SplashError Splash::fillWithPattern(SplashPath *path, GBool eo,
     xPath->aaScale();
   }
   xPath->sort();
+  if (!&xPath->segs[0])
+  {
+    delete xPath;
+    return splashErrEmptyPath;
+  }
   scanner = new SplashXPathScanner(xPath, eo);
 
   // get the min and max x and y values
@@ -1937,7 +1943,10 @@ SplashError Splash::fillImageMask(SplashImageMaskSource src, void *srcData,
   xq = w % scaledWidth;
 
   // allocate pixel buffer
-  pixBuf = (SplashColorPtr)gmalloc((yp + 1) * w);
+  if (yp < 0 || yp > INT_MAX - 1) {
+    return splashErrBadArg;
+  }
+  pixBuf = (SplashColorPtr)gmallocn(yp + 1, w);
 
   // initialize the pixel pipe
   pipeInit(&pipe, 0, 0, state->fillPattern, NULL, state->fillAlpha,
@@ -2233,9 +2242,12 @@ SplashError Splash::drawImage(SplashImageSource src, void *srcData,
   xq = w % scaledWidth;
 
   // allocate pixel buffers
-  colorBuf = (SplashColorPtr)gmalloc((yp + 1) * w * nComps);
+  if (yp < 0 || yp > INT_MAX - 1 || w > INT_MAX / nComps) {
+    return splashErrBadArg;
+  }
+  colorBuf = (SplashColorPtr)gmallocn(yp + 1, w * nComps);
   if (srcAlpha) {
-    alphaBuf = (Guchar *)gmalloc((yp + 1) * w);
+    alphaBuf = (Guchar *)gmallocn(yp + 1, w);
   } else {
     alphaBuf = NULL;
   }
diff --git a/kpdf/xpdf/splash/SplashBitmap.cc b/kpdf/xpdf/splash/SplashBitmap.cc
index 0cb1a752..62bbd8e8 100644
--- a/kpdf/xpdf/splash/SplashBitmap.cc
+++ b/kpdf/xpdf/splash/SplashBitmap.cc
@@ -11,6 +11,7 @@
 #endif
 
 #include <stdio.h>
+#include <limits.h>
 #include "gmem.h"
 #include "SplashErrorCodes.h"
 #include "SplashBitmap.h"
@@ -27,30 +28,48 @@ SplashBitmap::SplashBitmap(int widthA, int heightA, int rowPad,
   mode = modeA;
   switch (mode) {
   case splashModeMono1:
-    rowSize = (width + 7) >> 3;
+    if (width > 0) {
+      rowSize = (width + 7) >> 3;
+    } else {
+      rowSize = -1;
+    }
     break;
   case splashModeMono8:
-    rowSize = width;
+    if (width > 0) {
+      rowSize = width;
+    } else {
+      rowSize = -1;
+    }
     break;
   case splashModeRGB8:
   case splashModeBGR8:
-    rowSize = width * 3;
+    if (width > 0 && width <= INT_MAX / 3) {
+      rowSize = width * 3;
+    } else {
+      rowSize = -1;
+    }
     break;
 #if SPLASH_CMYK
   case splashModeCMYK8:
-    rowSize = width * 4;
+    if (width > 0 && width <= INT_MAX / 4) {
+      rowSize = width * 4;
+    } else {
+      rowSize = -1;
+    }
     break;
 #endif
   }
-  rowSize += rowPad - 1;
-  rowSize -= rowSize % rowPad;
-  data = (SplashColorPtr)gmalloc(rowSize * height);
+  if (rowSize > 0) {
+    rowSize += rowPad - 1;
+    rowSize -= rowSize % rowPad;
+  }
+  data = (SplashColorPtr)gmallocn(height, rowSize);
   if (!topDown) {
     data += (height - 1) * rowSize;
     rowSize = -rowSize;
   }
   if (alphaA) {
-    alpha = (Guchar *)gmalloc(width * height);
+    alpha = (Guchar *)gmallocn(width, height);
   } else {
     alpha = NULL;
   }
diff --git a/kpdf/xpdf/splash/SplashErrorCodes.h b/kpdf/xpdf/splash/SplashErrorCodes.h
index e7f1f0b5..711271ca 100644
--- a/kpdf/xpdf/splash/SplashErrorCodes.h
+++ b/kpdf/xpdf/splash/SplashErrorCodes.h
@@ -31,4 +31,6 @@
 
 #define splashErrZeroImage       9      // image of 0x0
 
+#define splashErrBadArg          9	// bad argument
+
 #endif
diff --git a/kpdf/xpdf/xpdf/Gfx.cc b/kpdf/xpdf/xpdf/Gfx.cc
index b37dcb54..e3df8384 100644
--- a/kpdf/xpdf/xpdf/Gfx.cc
+++ b/kpdf/xpdf/xpdf/Gfx.cc
@@ -461,6 +461,7 @@ Gfx::Gfx(XRef *xrefA, OutputDev *outA, int pageNum, Dict *resDict,
     baseMatrix[i] = state->getCTM()[i];
   }
   formDepth = 0;
+  parser = NULL;
   abortCheckCbk = abortCheckCbkA;
   abortCheckCbkData = abortCheckCbkDataA;
 
@@ -500,6 +501,7 @@ Gfx::Gfx(XRef *xrefA, OutputDev *outA, Dict *resDict,
     baseMatrix[i] = state->getCTM()[i];
   }
   formDepth = 0;
+  parser = NULL;
   abortCheckCbk = abortCheckCbkA;
   abortCheckCbkData = abortCheckCbkDataA;
 
diff --git a/kpdf/xpdf/xpdf/PSOutputDev.cc b/kpdf/xpdf/xpdf/PSOutputDev.cc
index d35739a5..4fb2cbfd 100644
--- a/kpdf/xpdf/xpdf/PSOutputDev.cc
+++ b/kpdf/xpdf/xpdf/PSOutputDev.cc
@@ -4386,7 +4386,7 @@ void PSOutputDev::doImageL1Sep(GfxImageColorMap *colorMap,
 	     width, -height, height);
 
   // allocate a line buffer
-  lineBuf = (Guchar *)gmalloc(4 * width);
+  lineBuf = (Guchar *)gmallocn(width, 4);
 
   // set up to process the data stream
   imgStr = new ImageStream(str, width, colorMap->getNumPixelComps(),
diff --git a/kpdf/xpdf/xpdf/Stream.cc b/kpdf/xpdf/xpdf/Stream.cc
index 20219522..2c1db5b4 100644
--- a/kpdf/xpdf/xpdf/Stream.cc
+++ b/kpdf/xpdf/xpdf/Stream.cc
@@ -323,6 +323,10 @@ ImageStream::ImageStream(Stream *strA, int widthA, int nCompsA, int nBitsA) {
   } else {
     imgLineSize = nVals;
   }
+  if (width > INT_MAX / nComps) {
+    // force a call to gmallocn(-1,...), which will throw an exception
+    imgLineSize = -1;
+  }
   imgLine = (Guchar *)gmallocn(imgLineSize, sizeof(Guchar));
   imgIdx = nVals;
 }
diff --git a/kpdf/xpdf/xpdf/XRef.cc b/kpdf/xpdf/xpdf/XRef.cc
index d12d812f..2e0d1cef 100644
--- a/kpdf/xpdf/xpdf/XRef.cc
+++ b/kpdf/xpdf/xpdf/XRef.cc
@@ -52,6 +52,8 @@ public:
   // generation 0.
   ObjectStream(XRef *xref, int objStrNumA);
 
+  GBool isOk() { return ok; }
+
   ~ObjectStream();
 
   // Return the object number of this object stream.
@@ -67,6 +69,7 @@ private:
   int nObjects;			// number of objects in the stream
   Object *objs;			// the objects (length = nObjects)
   int *objNums;			// the object numbers (length = nObjects)
+  GBool ok;
 };
 
 ObjectStream::ObjectStream(XRef *xref, int objStrNumA) {
@@ -80,6 +83,7 @@ ObjectStream::ObjectStream(XRef *xref, int objStrNumA) {
   nObjects = 0;
   objs = NULL;
   objNums = NULL;
+  ok = gFalse;
 
   if (!xref->fetch(objStrNum, 0, &objStr)->isStream()) {
     goto err1;
@@ -105,6 +109,13 @@ ObjectStream::ObjectStream(XRef *xref, int objStrNumA) {
     goto err1;
   }
 
+  // this is an arbitrary limit to avoid integer overflow problems
+  // in the 'new Object[nObjects]' call (Acrobat apparently limits
+  // object streams to 100-200 objects)
+  if (nObjects > 1000000) {
+    error(-1, "Too many objects in an object stream");
+    goto err1;
+  }
   objs = new Object[nObjects];
   objNums = (int *)gmallocn(nObjects, sizeof(int));
   offsets = (int *)gmallocn(nObjects, sizeof(int));
@@ -161,10 +172,10 @@ ObjectStream::ObjectStream(XRef *xref, int objStrNumA) {
   }
 
   gfree(offsets);
+  ok = gTrue;
 
  err1:
   objStr.free();
-  return;
 }
 
 ObjectStream::~ObjectStream() {
@@ -837,6 +848,11 @@ Object *XRef::fetch(int num, int gen, Object *obj) {
 	delete objStr;
       }
       objStr = new ObjectStream(this, e->offset);
+      if (!objStr->isOk()) {
+	delete objStr;
+	objStr = NULL;
+	goto err;
+      }
     }
     objStr->getObject(e->gen, num, obj);
     break;