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Index: kpdf/xpdf/xpdf/Stream.cc
===================================================================
--- kpdf/xpdf/xpdf/Stream.cc (revision 486295)
+++ kpdf/xpdf/xpdf/Stream.cc (working copy)
@@ -408,18 +408,33 @@ 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() {
@@ -1013,6 +1028,10 @@ 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;
}
@@ -2899,6 +2918,10 @@ GBool DCTStream::readBaselineSOF() {
height = read16();
width = read16();
numComps = str->getChar();
+ if (numComps <= 0 || numComps > 4) {
+ error(getPos(), "Bad number of components in DCT stream");
+ return gFalse;
+ }
if (prec != 8) {
error(getPos(), "Bad DCT precision %d", prec);
return gFalse;
@@ -3258,6 +3281,10 @@ 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;
}
Index: kpdf/xpdf/xpdf/Stream.h
===================================================================
--- kpdf/xpdf/xpdf/Stream.h (revision 486295)
+++ kpdf/xpdf/xpdf/Stream.h (working copy)
@@ -233,6 +233,8 @@ public:
~StreamPredictor();
+ GBool isOk() { return ok; }
+
int lookChar();
int getChar();
@@ -250,6 +252,7 @@ private:
int rowBytes; // bytes per line
Guchar *predLine; // line buffer
int predIdx; // current index in predLine
+ GBool ok;
};
//------------------------------------------------------------------------
Index: kpdf/xpdf/xpdf/JPXStream.cc
===================================================================
--- kpdf/xpdf/xpdf/JPXStream.cc (revision 486295)
+++ kpdf/xpdf/xpdf/JPXStream.cc (working copy)
@@ -666,7 +666,7 @@ GBool JPXStream::readCodestream(Guint /*
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;
@@ -701,8 +701,12 @@ GBool JPXStream::readCodestream(Guint /*
/ img.xTileSize;
img.nYTiles = (img.ySize - img.yTileOffset + img.yTileSize - 1)
/ img.yTileSize;
- img.tiles = (JPXTile *)gmalloc(img.nXTiles * img.nYTiles *
- sizeof(JPXTile));
+ nTiles = img.nXTiles * img.nYTiles;
+ if (img.nXTiles == 0 || nTiles / img.nXTiles != img.nYTiles) {
+ error(getPos(), "Bad tile count in JPX SIZ marker segment");
+ return gFalse;
+ }
+ img.tiles = (JPXTile *)gmallocn(nTiles, sizeof(JPXTile));
for (i = 0; i < img.nXTiles * img.nYTiles; ++i) {
img.tiles[i].tileComps = (JPXTileComp *)gmalloc(img.nComps *
sizeof(JPXTileComp));
Index: kpdf/xpdf/goo/gmem.c
===================================================================
--- kpdf/xpdf/goo/gmem.c (revision 486129)
+++ kpdf/xpdf/goo/gmem.c (working copy)
@@ -175,6 +175,28 @@ void gfree(void *p) {
#endif
}
+void *gmallocn(int nObjs, int objSize) {
+ int n;
+
+ n = nObjs * objSize;
+ if (objSize == 0 || n / objSize != nObjs) {
+ fprintf(stderr, "Bogus memory allocation size\n");
+ exit(1);
+ }
+ return gmalloc(n);
+}
+
+void *greallocn(void *p, int nObjs, int objSize) {
+ int n;
+
+ n = nObjs * objSize;
+ if (objSize == 0 || n / objSize != nObjs) {
+ fprintf(stderr, "Bogus memory allocation size\n");
+ exit(1);
+ }
+ return grealloc(p, n);
+}
+
#ifdef DEBUG_MEM
void gMemReport(FILE *f) {
GMemHdr *p;
Index: kpdf/xpdf/goo/gmem.h
===================================================================
--- kpdf/xpdf/goo/gmem.h (revision 486129)
+++ kpdf/xpdf/goo/gmem.h (working copy)
@@ -28,6 +28,15 @@ extern void *gmalloc(size_t size);
extern void *grealloc(void *p, size_t size);
/*
+ * These are similar to gmalloc and grealloc, but take an object count
+ * and size. The result is similar to allocating nObjs * objSize
+ * bytes, but there is an additional error check that the total size
+ * doesn't overflow an int.
+ */
+extern void *gmallocn(int nObjs, int objSize);
+extern void *greallocn(void *p, int nObjs, int objSize);
+
+/*
* Same as free, but checks for and ignores NULL pointers.
*/
extern void gfree(void *p);
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