Copied from Debian

From 662f74445b2fea2eeb759c6524661118aef567ca Mon Sep 17 00:00:00 2001
From: erouault <erouault>
Date: Sun, 21 Dec 2014 15:15:31 +0000
Subject: [PATCH] Fix various crasher bugs on fuzzed images. *
 libtiff/tif_dir.c: TIFFSetField(): refuse to set negative values for
 TIFFTAG_XRESOLUTION and TIFFTAG_YRESOLUTION that cause asserts when writing
 the directory * libtiff/tif_dirread.c: TIFFReadDirectory(): refuse to read
 ColorMap or TransferFunction if BitsPerSample has not yet been read,
 otherwise reading it later will cause user code to crash if BitsPerSample > 1
 * libtiff/tif_getimage.c: TIFFRGBAImageOK(): return FALSE if LOGLUV with
 SamplesPerPixel != 3, or if CIELAB with SamplesPerPixel != 3 or BitsPerSample
 != 8 * libtiff/tif_next.c: in the "run mode", use tilewidth for tiled images
 instead of imagewidth to avoid crash * tools/bmp2tiff.c: fix crash due to int
 overflow related to input BMP dimensions * tools/tiff2pdf.c: fix crash due to
 invalid tile count (should likely be checked by libtiff too). Detect invalid
 settings of BitsPerSample/SamplesPerPixel for CIELAB / ITULAB *
 tools/tiffcrop.c: fix crash due to invalid TileWidth/TileHeight *
 tools/tiffdump.c: fix crash due to overflow of entry count.

---
 ChangeLog              | 19 +++++++++++++++++++
 libtiff/tif_dir.c      | 21 +++++++++++++++++++--
 libtiff/tif_dirread.c  | 17 +++++++++++++++++
 libtiff/tif_getimage.c | 15 +++++++++++++++
 libtiff/tif_next.c     |  2 ++
 tools/bmp2tiff.c       | 15 +++++++++++++++
 tools/tiff2pdf.c       | 41 +++++++++++++++++++++++++++++++++++++++++
 tools/tiffcrop.c       |  7 ++++---
 tools/tiffdump.c       |  9 ++++++---
 9 files changed, 138 insertions(+), 8 deletions(-)

diff --git a/libtiff/tif_dir.c b/libtiff/tif_dir.c
index 98cf66d..ab43a28 100644
--- a/libtiff/tif_dir.c
+++ b/libtiff/tif_dir.c
@@ -160,6 +160,7 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
 	TIFFDirectory* td = &tif->tif_dir;
 	int status = 1;
 	uint32 v32, i, v;
+    double dblval;
 	char* s;
 	const TIFFField *fip = TIFFFindField(tif, tag, TIFF_ANY);
 	uint32 standard_tag = tag;
@@ -284,10 +285,16 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
 			setDoubleArrayOneValue(&td->td_smaxsamplevalue, va_arg(ap, double), td->td_samplesperpixel);
 		break;
 	case TIFFTAG_XRESOLUTION:
-		td->td_xresolution = (float) va_arg(ap, double);
+        dblval = va_arg(ap, double);
+        if( dblval < 0 )
+            goto badvaluedouble;
+		td->td_xresolution = (float) dblval;
 		break;
 	case TIFFTAG_YRESOLUTION:
-		td->td_yresolution = (float) va_arg(ap, double);
+        dblval = va_arg(ap, double);
+        if( dblval < 0 )
+            goto badvaluedouble;
+		td->td_yresolution = (float) dblval;
 		break;
 	case TIFFTAG_PLANARCONFIG:
 		v = (uint16) va_arg(ap, uint16_vap);
@@ -694,6 +701,16 @@ _TIFFVSetField(TIFF* tif, uint32 tag, va_list ap)
 		va_end(ap);
         }
 	return (0);
+badvaluedouble:
+        {
+        const TIFFField* fip=TIFFFieldWithTag(tif,tag);
+        TIFFErrorExt(tif->tif_clientdata, module,
+             "%s: Bad value %f for \"%s\" tag",
+             tif->tif_name, dblval,
+             fip ? fip->field_name : "Unknown");
+        va_end(ap);
+        }
+    return (0);
 }
 
 /*
diff --git a/libtiff/tif_dirread.c b/libtiff/tif_dirread.c
index 391c823..f66c9a7 100644
--- a/libtiff/tif_dirread.c
+++ b/libtiff/tif_dirread.c
@@ -3430,6 +3430,8 @@ TIFFReadDirectory(TIFF* tif)
 	const TIFFField* fip;
 	uint32 fii=FAILED_FII;
         toff_t nextdiroff;
+    int bitspersample_read = FALSE;
+
 	tif->tif_diroff=tif->tif_nextdiroff;
 	if (!TIFFCheckDirOffset(tif,tif->tif_nextdiroff))
 		return 0;           /* last offset or bad offset (IFD looping) */
@@ -3706,6 +3708,8 @@ TIFFReadDirectory(TIFF* tif)
 					}
 					if (!TIFFSetField(tif,dp->tdir_tag,value))
 						goto bad;
+                    if( dp->tdir_tag == TIFFTAG_BITSPERSAMPLE )
+                        bitspersample_read = TRUE;
 				}
 				break;
 			case TIFFTAG_SMINSAMPLEVALUE:
@@ -3763,6 +3767,19 @@ TIFFReadDirectory(TIFF* tif)
 					uint32 countrequired;
 					uint32 incrementpersample;
 					uint16* value=NULL;
+                    /* It would be dangerous to instanciate those tag values */
+                    /* since if td_bitspersample has not yet been read (due to */
+                    /* unordered tags), it could be read afterwards with a */
+                    /* values greater than the default one (1), which may cause */
+                    /* crashes in user code */
+                    if( !bitspersample_read )
+                    {
+                        fip = TIFFFieldWithTag(tif,dp->tdir_tag);
+                        TIFFWarningExt(tif->tif_clientdata,module,
+                                       "Ignoring %s since BitsPerSample tag not found",
+                                       fip ? fip->field_name : "unknown tagname");
+                        continue;
+                    }
 					countpersample=(1L<<tif->tif_dir.td_bitspersample);
 					if ((dp->tdir_tag==TIFFTAG_TRANSFERFUNCTION)&&(dp->tdir_count==(uint64)countpersample))
 					{
diff --git a/libtiff/tif_getimage.c b/libtiff/tif_getimage.c
index 074d32a..396ad08 100644
--- a/libtiff/tif_getimage.c
+++ b/libtiff/tif_getimage.c
@@ -182,8 +182,23 @@ TIFFRGBAImageOK(TIFF* tif, char emsg[1024])
 				    "Planarconfiguration", td->td_planarconfig);
 				return (0);
 			}
+			if( td->td_samplesperpixel != 3 )
+            {
+                sprintf(emsg,
+                        "Sorry, can not handle image with %s=%d",
+                        "Samples/pixel", td->td_samplesperpixel);
+                return 0;
+            }
 			break;
 		case PHOTOMETRIC_CIELAB:
+            if( td->td_samplesperpixel != 3 || td->td_bitspersample != 8 )
+            {
+                sprintf(emsg,
+                        "Sorry, can not handle image with %s=%d and %s=%d",
+                        "Samples/pixel", td->td_samplesperpixel,
+                        "Bits/sample", td->td_bitspersample);
+                return 0;
+            }
 			break;
 		default:
 			sprintf(emsg, "Sorry, can not handle image with %s=%d",
diff --git a/libtiff/tif_next.c b/libtiff/tif_next.c
index 55e2537..a53c716 100644
--- a/libtiff/tif_next.c
+++ b/libtiff/tif_next.c
@@ -102,6 +102,8 @@ NeXTDecode(TIFF* tif, uint8* buf, tmsize_t occ, uint16 s)
 		default: {
 			uint32 npixels = 0, grey;
 			uint32 imagewidth = tif->tif_dir.td_imagewidth;
+            if( isTiled(tif) )
+                imagewidth = tif->tif_dir.td_tilewidth;
 
 			/*
 			 * The scanline is composed of a sequence of constant
diff --git a/tools/tiff2pdf.c b/tools/tiff2pdf.c
index dfda963..f202b41 100644
--- a/tools/tiff2pdf.c
+++ b/tools/tiff2pdf.c
@@ -1167,6 +1167,15 @@ void t2p_read_tiff_init(T2P* t2p, TIFF* input){
 		if( (TIFFGetField(input, TIFFTAG_PLANARCONFIG, &xuint16) != 0)
 			&& (xuint16 == PLANARCONFIG_SEPARATE ) ){
 				TIFFGetField(input, TIFFTAG_SAMPLESPERPIXEL, &xuint16);
+                if( (t2p->tiff_tiles[i].tiles_tilecount % xuint16) != 0 )
+                {
+                    TIFFError(
+                        TIFF2PDF_MODULE, 
+                        "Invalid tile count, %s", 
+                        TIFFFileName(input));
+                    t2p->t2p_error = T2P_ERR_ERROR;
+                    return;
+                }
 				t2p->tiff_tiles[i].tiles_tilecount/= xuint16;
 		}
 		if( t2p->tiff_tiles[i].tiles_tilecount > 0){
@@ -1552,6 +1561,22 @@ void t2p_read_tiff_data(T2P* t2p, TIFF* input){
 #endif
 			break;
 		case PHOTOMETRIC_CIELAB:
+            if( t2p->tiff_samplesperpixel != 3){
+                TIFFError(
+                    TIFF2PDF_MODULE, 
+                    "Unsupported samplesperpixel = %d for CIELAB", 
+                    t2p->tiff_samplesperpixel);
+                t2p->t2p_error = T2P_ERR_ERROR;
+                return;
+            }
+            if( t2p->tiff_bitspersample != 8){
+                TIFFError(
+                    TIFF2PDF_MODULE, 
+                    "Invalid bitspersample = %d for CIELAB", 
+                    t2p->tiff_bitspersample);
+                t2p->t2p_error = T2P_ERR_ERROR;
+                return;
+            }
 			t2p->pdf_labrange[0]= -127;
 			t2p->pdf_labrange[1]= 127;
 			t2p->pdf_labrange[2]= -127;
@@ -1567,6 +1592,22 @@ void t2p_read_tiff_data(T2P* t2p, TIFF* input){
 			t2p->pdf_colorspace=T2P_CS_LAB;
 			break;
 		case PHOTOMETRIC_ITULAB:
+            if( t2p->tiff_samplesperpixel != 3){
+                TIFFError(
+                    TIFF2PDF_MODULE, 
+                    "Unsupported samplesperpixel = %d for ITULAB", 
+                    t2p->tiff_samplesperpixel);
+                t2p->t2p_error = T2P_ERR_ERROR;
+                return;
+            }
+            if( t2p->tiff_bitspersample != 8){
+                TIFFError(
+                    TIFF2PDF_MODULE, 
+                    "Invalid bitspersample = %d for ITULAB", 
+                    t2p->tiff_bitspersample);
+                t2p->t2p_error = T2P_ERR_ERROR;
+                return;
+            }
 			t2p->pdf_labrange[0]=-85;
 			t2p->pdf_labrange[1]=85;
 			t2p->pdf_labrange[2]=-75;
diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
index f5530bb..4088463 100644
--- a/tools/tiffcrop.c
+++ b/tools/tiffcrop.c
@@ -1205,9 +1205,10 @@ static int writeBufferToContigTiles (TIFF* out, uint8* buf, uint32 imagelength,
   tsize_t tilesize = TIFFTileSize(out);
   unsigned char *tilebuf = NULL;
 
-  TIFFGetField(out, TIFFTAG_TILELENGTH, &tl);
-  TIFFGetField(out, TIFFTAG_TILEWIDTH, &tw);
-  TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps);
+  if( !TIFFGetField(out, TIFFTAG_TILELENGTH, &tl) ||
+      !TIFFGetField(out, TIFFTAG_TILEWIDTH, &tw) ||
+      !TIFFGetField(out, TIFFTAG_BITSPERSAMPLE, &bps) )
+      return 1;
 
   tile_buffsize = tilesize;
   if (tilesize < (tsize_t)(tl * tile_rowsize))
diff --git a/tools/tiffdump.c b/tools/tiffdump.c
index cf5d62f..8247765 100644
--- a/tools/tiffdump.c
+++ b/tools/tiffdump.c
@@ -374,6 +374,8 @@ ReadDirectory(int fd, unsigned int ix, uint64 off)
 		void* datamem;
 		uint64 dataoffset;
 		int datatruncated;
+        int datasizeoverflow;
+
 		tag = *(uint16*)dp;
 		if (swabflag)
 			TIFFSwabShort(&tag);
@@ -412,13 +414,14 @@ ReadDirectory(int fd, unsigned int ix, uint64 off)
 		else
 			typewidth = datawidth[type];
 		datasize = count*typewidth;
+        datasizeoverflow = (typewidth > 0 && datasize / typewidth != count);
 		datafits = 1;
 		datamem = dp;
 		dataoffset = 0;
 		datatruncated = 0;
 		if (!bigtiff)
 		{
-			if (datasize>4)
+			if (datasizeoverflow || datasize>4)
 			{
 				uint32 dataoffset32;
 				datafits = 0;
@@ -432,7 +435,7 @@ ReadDirectory(int fd, unsigned int ix, uint64 off)
 		}
 		else
 		{
-			if (datasize>8)
+			if (datasizeoverflow || datasize>8)
 			{
 				datafits = 0;
 				datamem = NULL;
@@ -442,7 +445,7 @@ ReadDirectory(int fd, unsigned int ix, uint64 off)
 			}
 			dp += sizeof(uint64);
 		}
-		if (datasize>0x10000)
+		if (datasizeoverflow || datasize>0x10000)
 		{
 			datatruncated = 1;
 			count = 0x10000/typewidth;
