[gentoo-commits] gentoo-x86 commit in app-text/texlive-core/files/2007: xpdf-3.02pl2.patch

[Alexis Ballier (aballier)]

aballier    07/11/07 23:31:19

  Added:                xpdf-3.02pl2.patch
  Log:
  security fix for libxpdf, bug #196735
  (Portage version: 2.1.3.19)

Revision  Changes    Path
1.1                  app-text/texlive-core/files/2007/xpdf-3.02pl2.patch

file : http://sources.gentoo.org/viewcvs.py/gentoo-x86/app-text/texlive-core/files/2007/xpdf-3.02pl2.patch?rev=1.1&view=markup
plain: http://sources.gentoo.org/viewcvs.py/gentoo-x86/app-text/texlive-core/files/2007/xpdf-3.02pl2.patch?rev=1.1&content-type=text/plain

Index: xpdf-3.02pl2.patch
===================================================================
Index: tetex-src-3.0/libs/xpdf/xpdf/Stream.cc
===================================================================
--- tetex-src-3.0.orig/libs/xpdf/xpdf/Stream.cc
+++ tetex-src-3.0/libs/xpdf/xpdf/Stream.cc
@@ -1285,19 +1285,24 @@ CCITTFaxStream::CCITTFaxStream(Stream *s
     error (-1, "invalid number of columns: %d\n", columns);
     exit (1);
   }
+  else if (columns > INT_MAX - 2) columns = INT_MAX - 2;
   rows = rowsA;
   endOfBlock = endOfBlockA;
   black = blackA;
-  refLine = (short *)gmallocn(columns + 4, sizeof(short));
-  codingLine = (short *)gmallocn(columns + 3, sizeof(short));
+  // 0 <= codingLine[0] < codingLine[1] < ... < codingLine[n] = columns
+  // ---> max codingLine size = columns + 1
+  // refLine has one extra guard entry at the end
+  // ---> max refLine size = columns + 2
+  codingLine = (int *)gmallocn(columns + 1, sizeof(int));
+  refLine = (int *)gmallocn(columns + 2, sizeof(int));
 
   eof = gFalse;
   row = 0;
   nextLine2D = encoding < 0;
   inputBits = 0;
-  codingLine[0] = 0;
-  codingLine[1] = refLine[2] = columns;
-  a0 = 1;
+  codingLine[0] = columns;
+  a0i = 0;
+  outputBits = 0;
 
   buf = EOF;
 }
@@ -1316,9 +1321,9 @@ void CCITTFaxStream::reset() {
   row = 0;
   nextLine2D = encoding < 0;
   inputBits = 0;
-  codingLine[0] = 0;
-  codingLine[1] = refLine[2] = columns;
-  a0 = 1;
+  codingLine[0] = columns;
+  a0i = 0;
+  outputBits = 0;
   buf = EOF;
 
   // skip any initial zero bits and end-of-line marker, and get the 2D
@@ -1335,164 +1340,228 @@ void CCITTFaxStream::reset() {
   }
 }
 
+inline void CCITTFaxStream::addPixels(int a1, int blackPixels) {
+  if (a1 > codingLine[a0i]) {
+    if (a1 > columns) {
+      error(getPos(), "CCITTFax row is wrong length (%d)", a1);
+      err = gTrue;
+      a1 = columns;
+    }
+    if ((a0i & 1) ^ blackPixels) {
+      ++a0i;
+    }
+    codingLine[a0i] = a1;
+  }
+}
+
+inline void CCITTFaxStream::addPixelsNeg(int a1, int blackPixels) {
+  if (a1 > codingLine[a0i]) {
+    if (a1 > columns) {
+      error(getPos(), "CCITTFax row is wrong length (%d)", a1);
+      err = gTrue;
+      a1 = columns;
+    }
+    if ((a0i & 1) ^ blackPixels) {
+      ++a0i;
+    }
+    codingLine[a0i] = a1;
+  } else if (a1 < codingLine[a0i]) {
+    if (a1 < 0) {
+      error(getPos(), "Invalid CCITTFax code");
+      err = gTrue;
+      a1 = 0;
+    }
+    while (a0i > 0 && a1 <= codingLine[a0i - 1]) {
+      --a0i;
+    }
+    codingLine[a0i] = a1;
+  }
+}
+ 
 int CCITTFaxStream::lookChar() {
   short code1, code2, code3;
-  int a0New;
-  GBool err, gotEOL;
-  int ret;
-  int bits, i;
-
-  // if at eof just return EOF
-  if (eof && codingLine[a0] >= columns) {
-    return EOF;
+  int b1i, blackPixels, i, bits;
+  GBool gotEOL;
+  
+  if (buf != EOF) {
+    return buf;
   }
 
   // read the next row
-  err = gFalse;
-  if (codingLine[a0] >= columns) {
+  if (outputBits == 0) {
 
+    // if at eof just return EOF
+    if (eof) {
+      return EOF;
+    }
+
+    err = gFalse;
+  
     // 2-D encoding
     if (nextLine2D) {
       for (i = 0; codingLine[i] < columns; ++i)
 	refLine[i] = codingLine[i];
-      refLine[i] = refLine[i + 1] = columns;
-      b1 = 1;
-      a0New = codingLine[a0 = 0] = 0;
-      do {
-	code1 = getTwoDimCode();
+      refLine[i++] = columns;
+      refLine[i] = columns;
+      codingLine[0] = 0;
+      a0i = 0;
+      b1i = 0;
+      blackPixels = 0;
+      // invariant:
+      // refLine[b1i-1] <= codingLine[a0i] < refLine[b1i] < refLine[b1i+1]
+      //                                                             <= columns
+      // exception at left edge:
+      //   codingLine[a0i = 0] = refLine[b1i = 0] = 0 is possible
+      // exception at right edge:
+      //   refLine[b1i] = refLine[b1i+1] = columns is possible
+      while (codingLine[a0i] < columns) {
+  	code1 = getTwoDimCode();
 	switch (code1) {
-	case twoDimPass:
-	  if (refLine[b1] < columns) {
-	    a0New = refLine[b1 + 1];
-	    b1 += 2;
-	  }
-	  break;
-	case twoDimHoriz:
-	  if ((a0 & 1) == 0) {
-	    code1 = code2 = 0;
-	    do {
-	      code1 += code3 = getWhiteCode();
-	    } while (code3 >= 64);
-	    do {
-	      code2 += code3 = getBlackCode();
-	    } while (code3 >= 64);
-	  } else {
-	    code1 = code2 = 0;
-	    do {
-	      code1 += code3 = getBlackCode();
-	    } while (code3 >= 64);
-	    do {
-	      code2 += code3 = getWhiteCode();
-	    } while (code3 >= 64);
-	  }
-	  if (code1 > 0 || code2 > 0) {
-	    codingLine[a0 + 1] = a0New + code1;
-	    ++a0;
-	    a0New = codingLine[a0 + 1] = codingLine[a0] + code2;
-	    ++a0;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVert0:
-	  a0New = codingLine[++a0] = refLine[b1];
-	  if (refLine[b1] < columns) {
-	    ++b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVertR1:
-	  a0New = codingLine[++a0] = refLine[b1] + 1;
-	  if (refLine[b1] < columns) {
-	    ++b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVertL1:
-	  if (a0 == 0 || refLine[b1] - 1 > a0New) {
-	    a0New = codingLine[++a0] = refLine[b1] - 1;
-	    --b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVertR2:
-	  a0New = codingLine[++a0] = refLine[b1] + 2;
-	  if (refLine[b1] < columns) {
-	    ++b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVertL2:
-	  if (a0 == 0 || refLine[b1] - 2 > a0New) {
-	    a0New = codingLine[++a0] = refLine[b1] - 2;
-	    --b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVertR3:
-	  a0New = codingLine[++a0] = refLine[b1] + 3;
-	  if (refLine[b1] < columns) {
-	    ++b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case twoDimVertL3:
-	  if (a0 == 0 || refLine[b1] - 3 > a0New) {
-	    a0New = codingLine[++a0] = refLine[b1] - 3;
-	    --b1;
-	    while (refLine[b1] <= codingLine[a0] && refLine[b1] < columns)
-	      b1 += 2;
-	  }
-	  break;
-	case EOF:
-	  eof = gTrue;
-	  codingLine[a0 = 0] = columns;
-	  return EOF;
-	default:
-	  error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1);
-	  err = gTrue;
-	  break;
+  	case twoDimPass:
+ 	  addPixels(refLine[b1i + 1], blackPixels);
+ 	  if (refLine[b1i + 1] < columns) {
+ 	    b1i += 2;
+  	  }
+  	  break;
+  	case twoDimHoriz:
+ 	  code1 = code2 = 0;
+ 	  if (blackPixels) {
+  	    do {
+ 	      code1 += code3 = getBlackCode();
+  	    } while (code3 >= 64);
+  	    do {
+ 	      code2 += code3 = getWhiteCode();
+  	    } while (code3 >= 64);
+  	  } else {
+  	    do {
+ 	      code1 += code3 = getWhiteCode();
+  	    } while (code3 >= 64);
+  	    do {
+ 	      code2 += code3 = getBlackCode();
+  	    } while (code3 >= 64);
+  	  }
+ 	  addPixels(codingLine[a0i] + code1, blackPixels);
+ 	  if (codingLine[a0i] < columns) {
+ 	    addPixels(codingLine[a0i] + code2, blackPixels ^ 1);
+ 	  }
+ 	  while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	    b1i += 2;
+ 	  }
+ 	  break;
+ 	case twoDimVertR3:
+ 	  addPixels(refLine[b1i] + 3, blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    ++b1i;
+ 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+  	    }
+  	  }
+  	  break;
+ 	case twoDimVertR2:
+ 	  addPixels(refLine[b1i] + 2, blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    ++b1i;
+	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+  	    }
+  	  }
+  	  break;
+  	case twoDimVertR1:
+ 	  addPixels(refLine[b1i] + 1, blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    ++b1i;
+ 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+  	    }
+  	  }
+  	  break;
+ 	case twoDimVert0:
+ 	  addPixels(refLine[b1i], blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    ++b1i;
+ 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+  	    }
+  	  }
+  	  break;
+ 	case twoDimVertL3:
+ 	  addPixelsNeg(refLine[b1i] - 3, blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    if (b1i > 0) {
+ 	      --b1i;
+ 	    } else {
+	      ++b1i;
+ 	    }
+	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+  	    }
+  	  }
+  	  break;
+  	case twoDimVertL2:
+ 	  addPixelsNeg(refLine[b1i] - 2, blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    if (b1i > 0) {
+ 	      --b1i;
+ 	    } else {
+ 	      ++b1i;
+  	    }
+ 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+ 	    }
+  	  }
+  	  break;
+ 	case twoDimVertL1:
+ 	  addPixelsNeg(refLine[b1i] - 1, blackPixels);
+ 	  blackPixels ^= 1;
+ 	  if (codingLine[a0i] < columns) {
+ 	    if (b1i > 0) {
+ 	      --b1i;
+ 	    } else {
+ 	      ++b1i;
+ 	    }
+ 	    while (refLine[b1i] <= codingLine[a0i] && refLine[b1i] < columns) {
+ 	      b1i += 2;
+  	    }
+  	  }
+  	  break;
+  	case EOF:
+ 	  addPixels(columns, 0);
+  	  eof = gTrue;
+ 	  break;
+  	default:
+  	  error(getPos(), "Bad 2D code %04x in CCITTFax stream", code1);
+ 	  addPixels(columns, 0);
+  	  err = gTrue;
+  	  break;
+  	}
 	}
-      } while (codingLine[a0] < columns);
 
     // 1-D encoding
     } else {
-      codingLine[a0 = 0] = 0;
-      while (1) {
-	code1 = 0;
-	do {
-	  code1 += code3 = getWhiteCode();
-	} while (code3 >= 64);
-	codingLine[a0+1] = codingLine[a0] + code1;
-	++a0;
-	if (codingLine[a0] >= columns)
-	  break;
-	code2 = 0;
-	do {
-	  code2 += code3 = getBlackCode();
-	} while (code3 >= 64);
-	codingLine[a0+1] = codingLine[a0] + code2;
-	++a0;
-	if (codingLine[a0] >= columns)
-	  break;
-      }
-    }
-
-    if (codingLine[a0] != columns) {
-      error(getPos(), "CCITTFax row is wrong length (%d)", codingLine[a0]);
-      // force the row to be the correct length
-      while (codingLine[a0] > columns) {
-	--a0;
+       codingLine[0] = 0;
+       a0i = 0;
+       blackPixels = 0;
+       while (codingLine[a0i] < columns) {
+ 	code1 = 0;
+ 	if (blackPixels) {
+ 	  do {
+ 	    code1 += code3 = getBlackCode();
+ 	  } while (code3 >= 64);
+ 	} else {
+ 	  do {
+ 	    code1 += code3 = getWhiteCode();
+ 	  } while (code3 >= 64);
+  	}
+ 	addPixels(codingLine[a0i] + code1, blackPixels);
+ 	blackPixels ^= 1;
+        }
       }
-      codingLine[++a0] = columns;
-      err = gTrue;
-    }
 
     // byte-align the row
     if (byteAlign) {
@@ -1552,14 +1621,17 @@ int CCITTFaxStream::lookChar() {
     // this if we know the stream contains end-of-line markers because
     // the "just plow on" technique tends to work better otherwise
     } else if (err && endOfLine) {
-      do {
+      while (1) {
+	code1 = lookBits(13);
 	if (code1 == EOF) {
 	  eof = gTrue;
 	  return EOF;
 	}
+	if ((code1 >> 1) == 0x001) {
+	  break;
+	}
 	eatBits(1);
-	code1 = lookBits(13);
-      } while ((code1 >> 1) != 0x001);
+      }
       eatBits(12); 
       if (encoding > 0) {
 	eatBits(1);
@@ -1567,11 +1639,11 @@ int CCITTFaxStream::lookChar() {
       }
     }
 
-    a0 = 0;
-    outputBits = codingLine[1] - codingLine[0];
-    if (outputBits == 0) {
-      a0 = 1;
-      outputBits = codingLine[2] - codingLine[1];
+    // set up for output
+    if (codingLine[0] > 0) {
+      outputBits = codingLine[a0i = 0];
+    } else {
+      outputBits = codingLine[a0i = 1];
     }
 
     ++row;
@@ -1579,39 +1651,43 @@ int CCITTFaxStream::lookChar() {
 
   // get a byte
   if (outputBits >= 8) {
-    ret = ((a0 & 1) == 0) ? 0xff : 0x00;
-    if ((outputBits -= 8) == 0) {
-      ++a0;
-      if (codingLine[a0] < columns) {
-	outputBits = codingLine[a0 + 1] - codingLine[a0];
-      }
+    buf = (a0i & 1) ? 0x00 : 0xff;
+    outputBits -= 8;
+    if (outputBits == 0 && codingLine[a0i] < columns) {
+      ++a0i;
+      outputBits = codingLine[a0i] - codingLine[a0i - 1];
     }
   } else {
     bits = 8;
-    ret = 0;
+    buf = 0;
     do {
       if (outputBits > bits) {
-	i = bits;
-	bits = 0;
-	if ((a0 & 1) == 0) {
-	  ret |= 0xff >> (8 - i);
+	buf <<= bits;
+	if (!(a0i & 1)) {
+	  buf |= 0xff >> (8 - bits);
 	}
-	outputBits -= i;
+	outputBits -= bits;
+	bits = 0;
       } else {
-	i = outputBits;
-	bits -= outputBits;
-	if ((a0 & 1) == 0) {
-	  ret |= (0xff >> (8 - i)) << bits;
+	buf <<= outputBits;
+	if (!(a0i & 1)) {
+	  buf |= 0xff >> (8 - outputBits);
 	}
+	bits -= outputBits;
 	outputBits = 0;
-	++a0;
-	if (codingLine[a0] < columns) {
-	  outputBits = codingLine[a0 + 1] - codingLine[a0];
+	if (codingLine[a0i] < columns) {
+	  ++a0i;
+	  outputBits = codingLine[a0i] - codingLine[a0i - 1];
+	} else if (bits > 0) {
+	  buf <<= bits;
+	  bits = 0;
 	}
       }
-    } while (bits > 0 && codingLine[a0] < columns);
+    } while (bits);
+  }
+  if (black) {
+    buf ^= 0xff;
   }
-  buf = black ? (ret ^ 0xff) : ret;
   return buf;
 }
 
@@ -1653,6 +1729,9 @@ short CCITTFaxStream::getWhiteCode() {
   code = 0; // make gcc happy
   if (endOfBlock) {
     code = lookBits(12);
+    if (code == EOF) {
+      return 1;
+    }
     if ((code >> 5) == 0) {
       p = &whiteTab1[code];
     } else {
@@ -1665,6 +1744,9 @@ short CCITTFaxStream::getWhiteCode() {
   } else {
     for (n = 1; n <= 9; ++n) {
       code = lookBits(n);
+      if (code == EOF) {
+	return 1;
+      }
       if (n < 9) {
 	code <<= 9 - n;
       }
@@ -1676,6 +1758,9 @@ short CCITTFaxStream::getWhiteCode() {
     }
     for (n = 11; n <= 12; ++n) {
       code = lookBits(n);
+      if (code == EOF) {
+	return 1;
+      }
       if (n < 12) {
 	code <<= 12 - n;
       }
@@ -1701,6 +1786,9 @@ short CCITTFaxStream::getBlackCode() {
   code = 0; // make gcc happy
   if (endOfBlock) {
     code = lookBits(13);
+    if (code == EOF) {
+      return 1;
+    }
     if ((code >> 7) == 0) {
       p = &blackTab1[code];
     } else if ((code >> 9) == 0) {
@@ -1715,6 +1803,9 @@ short CCITTFaxStream::getBlackCode() {
   } else {
     for (n = 2; n <= 6; ++n) {
       code = lookBits(n);
+      if (code == EOF) {
+	return 1;
+      }
       if (n < 6) {
 	code <<= 6 - n;
       }
@@ -1726,6 +1817,9 @@ short CCITTFaxStream::getBlackCode() {
     }
     for (n = 7; n <= 12; ++n) {
       code = lookBits(n);
+      if (code == EOF) {
+	return 1;
+      }
       if (n < 12) {
 	code <<= 12 - n;
       }
@@ -1739,6 +1833,9 @@ short CCITTFaxStream::getBlackCode() {
     }
     for (n = 10; n <= 13; ++n) {
       code = lookBits(n);
+      if (code == EOF) {
+	return 1;
+      }
       if (n < 13) {
 	code <<= 13 - n;
       }
@@ -1961,6 +2058,12 @@ void DCTStream::reset() {
     // allocate a buffer for the whole image
     bufWidth = ((width + mcuWidth - 1) / mcuWidth) * mcuWidth;
     bufHeight = ((height + mcuHeight - 1) / mcuHeight) * mcuHeight;
+    if (bufWidth <= 0 || bufHeight <= 0 ||
+	bufWidth > INT_MAX / bufWidth / (int)sizeof(int)) {
+      error(getPos(), "Invalid image size in DCT stream");
+      y = height;
+      return;
+    }
     for (i = 0; i < numComps; ++i) {
       frameBuf[i] = (int *)gmallocn(bufWidth * bufHeight, sizeof(int));
       memset(frameBuf[i], 0, bufWidth * bufHeight * sizeof(int));
@@ -3024,6 +3127,11 @@ GBool DCTStream::readScanInfo() {
   }
   scanInfo.firstCoeff = str->getChar();
   scanInfo.lastCoeff = str->getChar();
+  if (scanInfo.firstCoeff < 0 || scanInfo.lastCoeff > 63 ||
+      scanInfo.firstCoeff > scanInfo.lastCoeff) {
+    error(getPos(), "Bad DCT coefficient numbers in scan info block");
+    return gFalse;
+  }
   c = str->getChar();
   scanInfo.ah = (c >> 4) & 0x0f;
   scanInfo.al = c & 0x0f;
Index: tetex-src-3.0/libs/xpdf/xpdf/Stream.h
===================================================================
--- tetex-src-3.0.orig/libs/xpdf/xpdf/Stream.h
+++ tetex-src-3.0/libs/xpdf/xpdf/Stream.h
@@ -519,13 +519,15 @@ private:
   int row;			// current row
   int inputBuf;			// input buffer
   int inputBits;		// number of bits in input buffer
-  short *refLine;		// reference line changing elements
-  int b1;			// index into refLine
-  short *codingLine;		// coding line changing elements
-  int a0;			// index into codingLine
+  int *codingLine;		// coding line changing elements
+  int *refLine;			// reference line changing elements
+  int a0i;			// index into codingLine
+  GBool err;			// error on current line
   int outputBits;		// remaining ouput bits
   int buf;			// character buffer
 
+  void addPixels(int a1, int black);
+  void addPixelsNeg(int a1, int black);
   short getTwoDimCode();
   short getWhiteCode();
   short getBlackCode();



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