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openSUSE:Leap:15.2:Staging:A
freeimage
CVE-2015-0852.patch
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File CVE-2015-0852.patch of Package freeimage
diff -rupN FreeImage/Source/FreeImage/PluginPCX.cpp FreeImage-new/Source/FreeImage/PluginPCX.cpp --- FreeImage/Source/FreeImage/PluginPCX.cpp 2015-03-02 02:07:08.000000000 +0100 +++ FreeImage-new/Source/FreeImage/PluginPCX.cpp 2015-09-05 02:44:55.429436425 +0200 @@ -30,7 +30,7 @@ // Constants + headers // ---------------------------------------------------------- -#define IO_BUF_SIZE 2048 +#define PCX_IO_BUF_SIZE 2048 // ---------------------------------------------------------- @@ -120,17 +120,17 @@ readline(FreeImageIO &io, fi_handle hand while (length--) { if (count == 0) { - if (*ReadPos >= IO_BUF_SIZE - 1 ) { - if (*ReadPos == IO_BUF_SIZE - 1) { + if (*ReadPos >= PCX_IO_BUF_SIZE - 1 ) { + if (*ReadPos == PCX_IO_BUF_SIZE - 1) { // we still have one BYTE, copy it to the start pos - *ReadBuf = ReadBuf[IO_BUF_SIZE - 1]; + *ReadBuf = ReadBuf[PCX_IO_BUF_SIZE - 1]; - io.read_proc(ReadBuf + 1, 1, IO_BUF_SIZE - 1, handle); + io.read_proc(ReadBuf + 1, 1, PCX_IO_BUF_SIZE - 1, handle); } else { // read the complete buffer - io.read_proc(ReadBuf, 1, IO_BUF_SIZE, handle); + io.read_proc(ReadBuf, 1, PCX_IO_BUF_SIZE, handle); } *ReadPos = 0; @@ -346,19 +346,9 @@ Load(FreeImageIO *io, fi_handle handle, BOOL header_only = (flags & FIF_LOAD_NOPIXELS) == FIF_LOAD_NOPIXELS; try { - // check PCX identifier - - long start_pos = io->tell_proc(handle); - BOOL validated = pcx_validate(io, handle); - io->seek_proc(handle, start_pos, SEEK_SET); - if(!validated) { - throw FI_MSG_ERROR_MAGIC_NUMBER; - } - - // process the header - PCXHEADER header; + // process the header if(io->read_proc(&header, sizeof(PCXHEADER), 1, handle) != 1) { throw FI_MSG_ERROR_PARSING; } @@ -366,20 +356,38 @@ Load(FreeImageIO *io, fi_handle handle, SwapHeader(&header); #endif - // allocate a new DIB + // process the window + const WORD *window = header.window; // left, upper, right,lower pixel coord. + const int left = window[0]; + const int top = window[1]; + const int right = window[2]; + const int bottom = window[3]; - unsigned width = header.window[2] - header.window[0] + 1; - unsigned height = header.window[3] - header.window[1] + 1; - unsigned bitcount = header.bpp * header.planes; - - if (bitcount == 24) { - dib = FreeImage_AllocateHeader(header_only, width, height, bitcount, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK); - } else { - dib = FreeImage_AllocateHeader(header_only, width, height, bitcount); + // check image size + if((left >= right) || (top >= bottom)) { + throw FI_MSG_ERROR_PARSING; } - // if the dib couldn't be allocated, throw an error + const unsigned width = right - left + 1; + const unsigned height = bottom - top + 1; + const unsigned bitcount = header.bpp * header.planes; + // allocate a new dib + switch(bitcount) { + case 1: + case 4: + case 8: + dib = FreeImage_AllocateHeader(header_only, width, height, bitcount); + break; + case 24: + dib = FreeImage_AllocateHeader(header_only, width, height, bitcount, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK); + break; + default: + throw FI_MSG_ERROR_DIB_MEMORY; + break; + } + + // if the dib couldn't be allocated, throw an error if (!dib) { throw FI_MSG_ERROR_DIB_MEMORY; } @@ -426,19 +434,23 @@ Load(FreeImageIO *io, fi_handle handle, if (palette_id == 0x0C) { BYTE *cmap = (BYTE*)malloc(768 * sizeof(BYTE)); - io->read_proc(cmap, 768, 1, handle); - pal = FreeImage_GetPalette(dib); - BYTE *pColormap = &cmap[0]; + if(cmap) { + io->read_proc(cmap, 768, 1, handle); - for(int i = 0; i < 256; i++) { - pal[i].rgbRed = pColormap[0]; - pal[i].rgbGreen = pColormap[1]; - pal[i].rgbBlue = pColormap[2]; - pColormap += 3; + pal = FreeImage_GetPalette(dib); + BYTE *pColormap = &cmap[0]; + + for(int i = 0; i < 256; i++) { + pal[i].rgbRed = pColormap[0]; + pal[i].rgbGreen = pColormap[1]; + pal[i].rgbBlue = pColormap[2]; + pColormap += 3; + } + + free(cmap); } - free(cmap); } // wrong palette ID, perhaps a gray scale is needed ? @@ -463,12 +475,12 @@ Load(FreeImageIO *io, fi_handle handle, return dib; } - // calculate the line length for the PCX and the DIB + // calculate the line length for the PCX and the dib // length of raster line in bytes - unsigned linelength = header.bytes_per_line * header.planes; - // length of DIB line (rounded to DWORD) in bytes - unsigned pitch = FreeImage_GetPitch(dib); + const unsigned linelength = header.bytes_per_line * header.planes; + // length of dib line (rounded to DWORD) in bytes + const unsigned pitch = FreeImage_GetPitch(dib); // run-length encoding ? @@ -478,14 +490,18 @@ Load(FreeImageIO *io, fi_handle handle, // --------------- line = (BYTE*)malloc(linelength * sizeof(BYTE)); - if(!line) throw FI_MSG_ERROR_MEMORY; + if(!line) { + throw FI_MSG_ERROR_MEMORY; + } - ReadBuf = (BYTE*)malloc(IO_BUF_SIZE * sizeof(BYTE)); - if(!ReadBuf) throw FI_MSG_ERROR_MEMORY; + ReadBuf = (BYTE*)malloc(PCX_IO_BUF_SIZE * sizeof(BYTE)); + if(!ReadBuf) { + throw FI_MSG_ERROR_MEMORY; + } bits = FreeImage_GetScanLine(dib, height - 1); - int ReadPos = IO_BUF_SIZE; + int ReadPos = PCX_IO_BUF_SIZE; if ((header.planes == 1) && ((header.bpp == 1) || (header.bpp == 8))) { BYTE skip; @@ -497,7 +513,7 @@ Load(FreeImageIO *io, fi_handle handle, // skip trailing garbage at the end of the scanline for (unsigned count = written; count < linelength; count++) { - if (ReadPos < IO_BUF_SIZE) { + if (ReadPos < PCX_IO_BUF_SIZE) { ReadPos++; } else { io->read_proc(&skip, sizeof(BYTE), 1, handle); @@ -513,7 +529,9 @@ Load(FreeImageIO *io, fi_handle handle, unsigned x, y, written; buffer = (BYTE*)malloc(width * sizeof(BYTE)); - if(!buffer) throw FI_MSG_ERROR_MEMORY; + if(!buffer) { + throw FI_MSG_ERROR_MEMORY; + } for (y = 0; y < height; y++) { written = readline(*io, handle, line, linelength, bIsRLE, ReadBuf, &ReadPos); @@ -532,7 +550,7 @@ Load(FreeImageIO *io, fi_handle handle, } } - // then write the DIB row + // then write the dib row for (x = 0; x < width / 2; x++) { bits[x] = (buffer[2*x] << 4) | buffer[2*x+1]; @@ -541,7 +559,7 @@ Load(FreeImageIO *io, fi_handle handle, // skip trailing garbage at the end of the scanline for (unsigned count = written; count < linelength; count++) { - if (ReadPos < IO_BUF_SIZE) { + if (ReadPos < PCX_IO_BUF_SIZE) { ReadPos++; } else { io->read_proc(&skip, sizeof(BYTE), 1, handle);
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