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From 249e097cacd9d25d9579d7e1b46a82fd0032585d Mon Sep 17 00:00:00 2001
From: tgl <tgl>
Date: Thu, 2 May 2013 14:54:08 +0000
Subject: [PATCH] Rewrite t2p_process_jpeg_strip(), to fix CVE-2013-1960.

----------------------------------------------------------------------------
2013-05-02  Tom Lane  <tgl@sss.pgh.pa.us>

 * tools/tiff2pdf.c: Rewrite JPEG marker parsing in
   t2p_process_jpeg_strip to be at least marginally competent.  The
   approach is still fundamentally flawed, but at least now it won't
   stomp all over memory when given bogus input.  Fixes CVE-2013-1960.
----------------------------------------------------------------------------

diff --git a/tools/tiff2pdf.c b/tools/tiff2pdf.c
index b9a6075..5c424b4 100644
--- a/tools/tiff2pdf.c
+++ b/tools/tiff2pdf.c
@@ -3341,33 +3341,56 @@ int t2p_process_jpeg_strip(
 	uint32 height){
 
 	tsize_t i=0;
-	uint16 ri =0;
-	uint16 v_samp=1;
-	uint16 h_samp=1;
-	int j=0;
-	
-	i++;
-	
-	while(i<(*striplength)){
+
+	while (i < *striplength) {
+		tsize_t datalen;
+		uint16 ri;
+		uint16 v_samp;
+		uint16 h_samp;
+		int j;
+		int ncomp;
+
+		/* marker header: one or more FFs */
+		if (strip[i] != 0xff)
+			return(0);
+		i++;
+		while (i < *striplength && strip[i] == 0xff)
+			i++;
+		if (i >= *striplength)
+			return(0);
+		/* SOI is the only pre-SOS marker without a length word */
+		if (strip[i] == 0xd8)
+			datalen = 0;
+		else {
+			if ((*striplength - i) <= 2)
+				return(0);
+			datalen = (strip[i+1] << 8) | strip[i+2];
+			if (datalen < 2 || datalen >= (*striplength - i))
+				return(0);
+		}
 		switch( strip[i] ){
-			case 0xd8:
-				/* SOI - start of image */
+			case 0xd8:	/* SOI - start of image */
 				_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), 2);
 				*bufferoffset+=2;
-				i+=2;
 				break;
-			case 0xc0:
-			case 0xc1:
-			case 0xc3:
-			case 0xc9:
-			case 0xca:
+			case 0xc0:	/* SOF0 */
+			case 0xc1:	/* SOF1 */
+			case 0xc3:	/* SOF3 */
+			case 0xc9:	/* SOF9 */
+			case 0xca:	/* SOF10 */
 				if(no==0){
-					_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), strip[i+2]+2);
-					for(j=0;j<buffer[*bufferoffset+9];j++){
-						if( (buffer[*bufferoffset+11+(2*j)]>>4) > h_samp) 
-							h_samp = (buffer[*bufferoffset+11+(2*j)]>>4);
-						if( (buffer[*bufferoffset+11+(2*j)] & 0x0f) > v_samp) 
-							v_samp = (buffer[*bufferoffset+11+(2*j)] & 0x0f);
+					_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), datalen+2);
+					ncomp = buffer[*bufferoffset+9];
+					if (ncomp < 1 || ncomp > 4)
+						return(0);
+					v_samp=1;
+					h_samp=1;
+					for(j=0;j<ncomp;j++){
+						uint16 samp = buffer[*bufferoffset+11+(3*j)];
+						if( (samp>>4) > h_samp) 
+							h_samp = (samp>>4);
+						if( (samp & 0x0f) > v_samp) 
+							v_samp = (samp & 0x0f);
 					}
 					v_samp*=8;
 					h_samp*=8;
@@ -3381,45 +3404,43 @@ int t2p_process_jpeg_strip(
                                           (unsigned char) ((height>>8) & 0xff);
 					buffer[*bufferoffset+6]=
                                             (unsigned char) (height & 0xff);
-					*bufferoffset+=strip[i+2]+2;
-					i+=strip[i+2]+2;
-
+					*bufferoffset+=datalen+2;
+					/* insert a DRI marker */
 					buffer[(*bufferoffset)++]=0xff;
 					buffer[(*bufferoffset)++]=0xdd;
 					buffer[(*bufferoffset)++]=0x00;
 					buffer[(*bufferoffset)++]=0x04;
 					buffer[(*bufferoffset)++]=(ri >> 8) & 0xff;
 					buffer[(*bufferoffset)++]= ri & 0xff;
-				} else {
-					i+=strip[i+2]+2;
 				}
 				break;
-			case 0xc4:
-			case 0xdb:
-				_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), strip[i+2]+2);
-				*bufferoffset+=strip[i+2]+2;
-				i+=strip[i+2]+2;
+			case 0xc4: /* DHT */
+			case 0xdb: /* DQT */
+				_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), datalen+2);
+				*bufferoffset+=datalen+2;
 				break;
-			case 0xda:
+			case 0xda: /* SOS */
 				if(no==0){
-					_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), strip[i+2]+2);
-					*bufferoffset+=strip[i+2]+2;
-					i+=strip[i+2]+2;
+					_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), datalen+2);
+					*bufferoffset+=datalen+2;
 				} else {
 					buffer[(*bufferoffset)++]=0xff;
 					buffer[(*bufferoffset)++]=
                                             (unsigned char)(0xd0 | ((no-1)%8));
-					i+=strip[i+2]+2;
 				}
-				_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i-1]), (*striplength)-i-1);
-				*bufferoffset+=(*striplength)-i-1;
+				i += datalen + 1;
+				/* copy remainder of strip */
+				_TIFFmemcpy(&(buffer[*bufferoffset]), &(strip[i]), *striplength - i);
+				*bufferoffset+= *striplength - i;
 				return(1);
 			default:
-				i+=strip[i+2]+2;
+				/* ignore any other marker */
+				break;
 		}
+		i += datalen + 1;
 	}
-	
 
+	/* failed to find SOS marker */
 	return(0);
 }
 #endif
-- 
1.7.10.2