Index: kpdf/xpdf/xpdf/JBIG2Stream.cc =================================================================== --- kpdf/xpdf/xpdf/JBIG2Stream.cc (revision 481099) +++ kpdf/xpdf/xpdf/JBIG2Stream.cc (revision 488715) @@ -7,6 +7,7 @@ //======================================================================== #include +#include #ifdef USE_GCC_PRAGMAS #pragma implementation @@ -681,6 +682,12 @@ JBIG2Bitmap::JBIG2Bitmap(Guint segNumA, w = wA; h = hA; line = (wA + 7) >> 3; + + if (h < 0 || line <= 0 || h >= (INT_MAX - 1) / line ) { + data = NULL; + return; + } + // need to allocate one extra guard byte for use in combine() data = (Guchar *)gmalloc(h * line + 1); data[h * line] = 0; @@ -692,6 +699,12 @@ JBIG2Bitmap::JBIG2Bitmap(Guint segNumA, w = bitmap->w; h = bitmap->h; line = bitmap->line; + + if (h < 0 || line <= 0 || h >= (INT_MAX - 1) / line) { + data = NULL; + return; + } + // need to allocate one extra guard byte for use in combine() data = (Guchar *)gmalloc(h * line + 1); memcpy(data, bitmap->data, h * line); @@ -720,7 +733,8 @@ JBIG2Bitmap *JBIG2Bitmap::getSlice(Guint } void JBIG2Bitmap::expand(int newH, Guint pixel) { - if (newH <= h) { + + if (newH <= h || line <= 0 || newH >= (INT_MAX - 1) / line) { return; } // need to allocate one extra guard byte for use in combine() @@ -2305,6 +2319,15 @@ void JBIG2Stream::readHalftoneRegionSeg( error(getPos(), "Bad symbol dictionary reference in JBIG2 halftone segment"); return; } + if (gridH == 0 || gridW >= INT_MAX / gridH) { + error(getPos(), "Bad size in JBIG2 halftone segment"); + return; + } + if (h < 0 || w == 0 || h >= INT_MAX / w) { + error(getPos(), "Bad size in JBIG2 bitmap segment"); + return; + } + patternDict = (JBIG2PatternDict *)seg; bpp = 0; i = 1; @@ -2936,6 +2959,9 @@ JBIG2Bitmap *JBIG2Stream::readGenericRef JBIG2BitmapPtr tpgrCXPtr0, tpgrCXPtr1, tpgrCXPtr2; int x, y, pix; + if (w < 0 || h <= 0 || w >= INT_MAX / h) + return NULL; + bitmap = new JBIG2Bitmap(0, w, h); bitmap->clearToZero(); Index: kpdf/xpdf/xpdf/Stream.cc =================================================================== --- kpdf/xpdf/xpdf/Stream.cc (revision 481099) +++ kpdf/xpdf/xpdf/Stream.cc (revision 488715) @@ -15,6 +15,7 @@ #include #include #include +#include #ifndef WIN32 #include #endif @@ -408,13 +409,27 @@ StreamPredictor::StreamPredictor(Stream 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() { @@ -1006,6 +1021,10 @@ 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; } @@ -1258,8 +1277,9 @@ CCITTFaxStream::CCITTFaxStream(Stream *s endOfLine = endOfLineA; byteAlign = byteAlignA; columns = columnsA; - if (columns < 1) { - columns = 1; + if (columns < 1 || columns >= INT_MAX / sizeof(short)) { + error(getPos(), "Bad number of columns in CCITTFaxStream"); + exit(1); } rows = rowsA; endOfBlock = endOfBlockA; @@ -2903,7 +2923,12 @@ GBool DCTStream::readBaselineSOF() { height = read16(); width = read16(); numComps = str->getChar(); - if (prec != 8) { + if (numComps <= 0 || numComps > 4) { + numComps = 0; + error(getPos(), "Bad number of components in DCT stream", prec); + return gFalse; + } + if (prec != 8) { error(getPos(), "Bad DCT precision %d", prec); return gFalse; } @@ -2929,6 +2954,11 @@ GBool DCTStream::readProgressiveSOF() { height = read16(); width = read16(); numComps = str->getChar(); + if (numComps <= 0 || numComps > 4) { + numComps = 0; + error(getPos(), "Bad number of components in DCT stream"); + return gFalse; + } if (prec != 8) { error(getPos(), "Bad DCT precision %d", prec); return gFalse; @@ -2951,6 +2981,11 @@ GBool DCTStream::readScanInfo() { length = read16() - 2; scanInfo.numComps = str->getChar(); + if (scanInfo.numComps <= 0 || scanInfo.numComps > 4) { + scanInfo.numComps = 0; + 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"); @@ -3035,12 +3070,12 @@ GBool DCTStream::readHuffmanTables() { 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]; @@ -3833,6 +3868,10 @@ 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 481099) +++ kpdf/xpdf/xpdf/Stream.h (revision 488715) @@ -232,6 +232,8 @@ public: ~StreamPredictor(); + GBool isOk() { return ok; } + int lookChar(); int getChar(); @@ -249,6 +251,7 @@ private: int rowBytes; // bytes per line Guchar *predLine; // line buffer int predIdx; // current index in predLine + GBool ok; }; //------------------------------------------------------------------------ --- kpdf/xpdf/xpdf/JPXStream.cc (revision 481099) +++ kpdf/xpdf/xpdf/JPXStream.cc (revision 488715) @@ -7,6 +7,7 @@ //======================================================================== #include +#include #ifdef USE_GCC_PRAGMAS #pragma implementation @@ -783,7 +784,7 @@ 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; @@ -818,8 +819,13 @@ GBool JPXStream::readCodestream(Guint /* / img.xTileSize; img.nYTiles = (img.ySize - img.yTileOffset + img.yTileSize - 1) / img.yTileSize; - img.tiles = (JPXTile *)gmallocn(img.nXTiles * img.nYTiles, - sizeof(JPXTile)); + nTiles = img.nXTiles * img.nYTiles; + // check for overflow before allocating memory + if (img.nXTiles <= 0 || img.nYTiles <= 0 || img.nXTiles >= INT_MAX / 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 *)gmallocn(img.nComps, sizeof(JPXTileComp)); Index: kpdf/xpdf/goo/gmem.c =================================================================== --- kpdf/xpdf/goo/gmem.c (revision 481099) +++ kpdf/xpdf/goo/gmem.c (revision 488715) @@ -11,6 +11,7 @@ #include #include #include +#include #include "gmem.h" #ifdef DEBUG_MEM @@ -141,7 +142,7 @@ void *gmallocn(int nObjs, int objSize) { int n; n = nObjs * objSize; - if (objSize == 0 || n / objSize != nObjs) { + if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) { fprintf(stderr, "Bogus memory allocation size\n"); exit(1); } @@ -152,7 +153,7 @@ void *greallocn(void *p, int nObjs, int int n; n = nObjs * objSize; - if (objSize == 0 || n / objSize != nObjs) { + if (objSize <= 0 || nObjs < 0 || nObjs >= INT_MAX / objSize) { fprintf(stderr, "Bogus memory allocation size\n"); exit(1); }