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Diffstat (limited to 'third_party/libtiff/tif_dirread.c')
-rw-r--r--third_party/libtiff/tif_dirread.c177
1 files changed, 152 insertions, 25 deletions
diff --git a/third_party/libtiff/tif_dirread.c b/third_party/libtiff/tif_dirread.c
index ab938eac9d..521dbf0a41 100644
--- a/third_party/libtiff/tif_dirread.c
+++ b/third_party/libtiff/tif_dirread.c
@@ -1,4 +1,4 @@
-/* $Id: tif_dirread.c,v 1.208 2017-04-27 15:46:22 erouault Exp $ */
+/* $Id: tif_dirread.c,v 1.218 2017-09-09 21:44:42 erouault Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@@ -42,6 +42,7 @@
#include "tiffiop.h"
#include <float.h>
#include <limits.h>
+#include <stdlib.h>
#define IGNORE 0 /* tag placeholder used below */
#define FAILED_FII ((uint32) -1)
@@ -637,6 +638,8 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryFloat(TIFF* tif, TIFFDirEntry* d
err=TIFFReadDirEntryCheckedDouble(tif,direntry,&m);
if (err!=TIFFReadDirEntryErrOk)
return(err);
+ if ((m > FLT_MAX) || (m < FLT_MIN))
+ return(TIFFReadDirEntryErrRange);
*value=(float)m;
return(TIFFReadDirEntryErrOk);
}
@@ -766,13 +769,80 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryIfd8(TIFF* tif, TIFFDirEntry* di
}
}
-static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* direntry, uint32* count, uint32 desttypesize, void** value)
+
+#define INITIAL_THRESHOLD (1024 * 1024)
+#define THRESHOLD_MULTIPLIER 10
+#define MAX_THRESHOLD (THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * THRESHOLD_MULTIPLIER * INITIAL_THRESHOLD)
+
+static enum TIFFReadDirEntryErr TIFFReadDirEntryDataAndRealloc(
+ TIFF* tif, uint64 offset, tmsize_t size, void** pdest)
+{
+#if SIZEOF_VOIDP == 8 || SIZEOF_SIZE_T == 8
+ tmsize_t threshold = INITIAL_THRESHOLD;
+#endif
+ tmsize_t already_read = 0;
+
+ assert( !isMapped(tif) );
+
+ if (!SeekOK(tif,offset))
+ return(TIFFReadDirEntryErrIo);
+
+ /* On 64 bit processes, read first a maximum of 1 MB, then 10 MB, etc */
+ /* so as to avoid allocating too much memory in case the file is too */
+ /* short. We could ask for the file size, but this might be */
+ /* expensive with some I/O layers (think of reading a gzipped file) */
+ /* Restrict to 64 bit processes, so as to avoid reallocs() */
+ /* on 32 bit processes where virtual memory is scarce. */
+ while( already_read < size )
+ {
+ void* new_dest;
+ tmsize_t bytes_read;
+ tmsize_t to_read = size - already_read;
+#if SIZEOF_VOIDP == 8 || SIZEOF_SIZE_T == 8
+ if( to_read >= threshold && threshold < MAX_THRESHOLD )
+ {
+ to_read = threshold;
+ threshold *= THRESHOLD_MULTIPLIER;
+ }
+#endif
+
+ new_dest = (uint8*) _TIFFrealloc(
+ *pdest, already_read + to_read);
+ if( new_dest == NULL )
+ {
+ TIFFErrorExt(tif->tif_clientdata, tif->tif_name,
+ "Failed to allocate memory for %s "
+ "(%ld elements of %ld bytes each)",
+ "TIFFReadDirEntryArray",
+ (long) 1, (long) (already_read + to_read));
+ return TIFFReadDirEntryErrAlloc;
+ }
+ *pdest = new_dest;
+
+ bytes_read = TIFFReadFile(tif,
+ (char*)*pdest + already_read, to_read);
+ already_read += bytes_read;
+ if (bytes_read != to_read) {
+ return TIFFReadDirEntryErrIo;
+ }
+ }
+ return TIFFReadDirEntryErrOk;
+}
+
+static enum TIFFReadDirEntryErr TIFFReadDirEntryArrayWithLimit(
+ TIFF* tif, TIFFDirEntry* direntry, uint32* count, uint32 desttypesize,
+ void** value, uint64 maxcount)
{
int typesize;
uint32 datasize;
void* data;
+ uint64 target_count64;
typesize=TIFFDataWidth(direntry->tdir_type);
- if ((direntry->tdir_count==0)||(typesize==0))
+
+ target_count64 = (direntry->tdir_count > maxcount) ?
+ maxcount : direntry->tdir_count;
+
+ if ((target_count64==0)||(typesize==0))
{
*value=0;
return(TIFFReadDirEntryErrOk);
@@ -784,17 +854,30 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* d
* in either the current data type or the dest data type. This also
* avoids problems with overflow of tmsize_t on 32bit systems.
*/
- if ((uint64)(2147483647/typesize)<direntry->tdir_count)
+ if ((uint64)(2147483647/typesize)<target_count64)
return(TIFFReadDirEntryErrSizesan);
- if ((uint64)(2147483647/desttypesize)<direntry->tdir_count)
+ if ((uint64)(2147483647/desttypesize)<target_count64)
return(TIFFReadDirEntryErrSizesan);
- *count=(uint32)direntry->tdir_count;
+ *count=(uint32)target_count64;
datasize=(*count)*typesize;
assert((tmsize_t)datasize>0);
- data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
- if (data==0)
- return(TIFFReadDirEntryErrAlloc);
+
+ if( isMapped(tif) && datasize > (uint32)tif->tif_size )
+ return TIFFReadDirEntryErrIo;
+
+ if( !isMapped(tif) &&
+ (((tif->tif_flags&TIFF_BIGTIFF) && datasize > 8) ||
+ (!(tif->tif_flags&TIFF_BIGTIFF) && datasize > 4)) )
+ {
+ data = NULL;
+ }
+ else
+ {
+ data=_TIFFCheckMalloc(tif, *count, typesize, "ReadDirEntryArray");
+ if (data==0)
+ return(TIFFReadDirEntryErrAlloc);
+ }
if (!(tif->tif_flags&TIFF_BIGTIFF))
{
if (datasize<=4)
@@ -805,7 +888,10 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* d
uint32 offset = direntry->tdir_offset.toff_long;
if (tif->tif_flags&TIFF_SWAB)
TIFFSwabLong(&offset);
- err=TIFFReadDirEntryData(tif,(uint64)offset,(tmsize_t)datasize,data);
+ if( isMapped(tif) )
+ err=TIFFReadDirEntryData(tif,(uint64)offset,(tmsize_t)datasize,data);
+ else
+ err=TIFFReadDirEntryDataAndRealloc(tif,(uint64)offset,(tmsize_t)datasize,&data);
if (err!=TIFFReadDirEntryErrOk)
{
_TIFFfree(data);
@@ -823,7 +909,10 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* d
uint64 offset = direntry->tdir_offset.toff_long8;
if (tif->tif_flags&TIFF_SWAB)
TIFFSwabLong8(&offset);
- err=TIFFReadDirEntryData(tif,offset,(tmsize_t)datasize,data);
+ if( isMapped(tif) )
+ err=TIFFReadDirEntryData(tif,(uint64)offset,(tmsize_t)datasize,data);
+ else
+ err=TIFFReadDirEntryDataAndRealloc(tif,(uint64)offset,(tmsize_t)datasize,&data);
if (err!=TIFFReadDirEntryErrOk)
{
_TIFFfree(data);
@@ -835,6 +924,12 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* d
return(TIFFReadDirEntryErrOk);
}
+static enum TIFFReadDirEntryErr TIFFReadDirEntryArray(TIFF* tif, TIFFDirEntry* direntry, uint32* count, uint32 desttypesize, void** value)
+{
+ return TIFFReadDirEntryArrayWithLimit(tif, direntry, count,
+ desttypesize, value, ~((uint64)0));
+}
+
static enum TIFFReadDirEntryErr TIFFReadDirEntryByteArray(TIFF* tif, TIFFDirEntry* direntry, uint8** value)
{
enum TIFFReadDirEntryErr err;
@@ -1864,7 +1959,8 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntrySlongArray(TIFF* tif, TIFFDirEnt
return(TIFFReadDirEntryErrOk);
}
-static enum TIFFReadDirEntryErr TIFFReadDirEntryLong8Array(TIFF* tif, TIFFDirEntry* direntry, uint64** value)
+static enum TIFFReadDirEntryErr TIFFReadDirEntryLong8ArrayWithLimit(
+ TIFF* tif, TIFFDirEntry* direntry, uint64** value, uint64 maxcount)
{
enum TIFFReadDirEntryErr err;
uint32 count;
@@ -1884,7 +1980,7 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryLong8Array(TIFF* tif, TIFFDirEnt
default:
return(TIFFReadDirEntryErrType);
}
- err=TIFFReadDirEntryArray(tif,direntry,&count,8,&origdata);
+ err=TIFFReadDirEntryArrayWithLimit(tif,direntry,&count,8,&origdata,maxcount);
if ((err!=TIFFReadDirEntryErrOk)||(origdata==0))
{
*value=0;
@@ -2030,6 +2126,11 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryLong8Array(TIFF* tif, TIFFDirEnt
return(TIFFReadDirEntryErrOk);
}
+static enum TIFFReadDirEntryErr TIFFReadDirEntryLong8Array(TIFF* tif, TIFFDirEntry* direntry, uint64** value)
+{
+ return TIFFReadDirEntryLong8ArrayWithLimit(tif, direntry, value, ~((uint64)0));
+}
+
static enum TIFFReadDirEntryErr TIFFReadDirEntrySlong8Array(TIFF* tif, TIFFDirEntry* direntry, int64** value)
{
enum TIFFReadDirEntryErr err;
@@ -2732,7 +2833,7 @@ static enum TIFFReadDirEntryErr TIFFReadDirEntryPersampleShort(TIFF* tif, TIFFDi
if (direntry->tdir_count<(uint64)tif->tif_dir.td_samplesperpixel)
return(TIFFReadDirEntryErrCount);
err=TIFFReadDirEntryShortArray(tif,direntry,&m);
- if (err!=TIFFReadDirEntryErrOk)
+ if (err!=TIFFReadDirEntryErrOk || m == NULL)
return(err);
na=m;
nb=tif->tif_dir.td_samplesperpixel;
@@ -3581,6 +3682,10 @@ TIFFReadDirectory(TIFF* tif)
goto bad;
dp->tdir_tag=IGNORE;
break;
+ default:
+ if( !_TIFFCheckFieldIsValidForCodec(tif, dp->tdir_tag) )
+ dp->tdir_tag=IGNORE;
+ break;
}
}
}
@@ -3987,12 +4092,14 @@ TIFFReadDirectory(TIFF* tif)
#define BYTECOUNTLOOKSBAD \
( (tif->tif_dir.td_stripbytecount[0] == 0 && tif->tif_dir.td_stripoffset[0] != 0) || \
(tif->tif_dir.td_compression == COMPRESSION_NONE && \
- tif->tif_dir.td_stripbytecount[0] > TIFFGetFileSize(tif) - tif->tif_dir.td_stripoffset[0]) || \
+ (tif->tif_dir.td_stripoffset[0] <= TIFFGetFileSize(tif) && \
+ tif->tif_dir.td_stripbytecount[0] > TIFFGetFileSize(tif) - tif->tif_dir.td_stripoffset[0])) || \
(tif->tif_mode == O_RDONLY && \
tif->tif_dir.td_compression == COMPRESSION_NONE && \
tif->tif_dir.td_stripbytecount[0] < TIFFScanlineSize64(tif) * tif->tif_dir.td_imagelength) )
} else if (tif->tif_dir.td_nstrips == 1
+ && !(tif->tif_flags&TIFF_ISTILED)
&& _TIFFFillStriles(tif)
&& tif->tif_dir.td_stripoffset[0] != 0
&& BYTECOUNTLOOKSBAD) {
@@ -4370,7 +4477,11 @@ EstimateStripByteCounts(TIFF* tif, TIFFDirEntry* dir, uint16 dircount)
}
space+=datasize;
}
- space = filesize - space;
+ if( filesize < space )
+ /* we should perhaps return in error ? */
+ space = filesize;
+ else
+ space = filesize - space;
if (td->td_planarconfig == PLANARCONFIG_SEPARATE)
space /= td->td_samplesperpixel;
for (strip = 0; strip < td->td_nstrips; strip++)
@@ -5437,28 +5548,39 @@ TIFFFetchStripThing(TIFF* tif, TIFFDirEntry* dir, uint32 nstrips, uint64** lpp)
static const char module[] = "TIFFFetchStripThing";
enum TIFFReadDirEntryErr err;
uint64* data;
- err=TIFFReadDirEntryLong8Array(tif,dir,&data);
+ err=TIFFReadDirEntryLong8ArrayWithLimit(tif,dir,&data,nstrips);
if (err!=TIFFReadDirEntryErrOk)
{
const TIFFField* fip = TIFFFieldWithTag(tif,dir->tdir_tag);
TIFFReadDirEntryOutputErr(tif,err,module,fip ? fip->field_name : "unknown tagname",0);
return(0);
}
- if (dir->tdir_count!=(uint64)nstrips)
+ if (dir->tdir_count<(uint64)nstrips)
{
uint64* resizeddata;
+ const TIFFField* fip = TIFFFieldWithTag(tif,dir->tdir_tag);
+ const char* pszMax = getenv("LIBTIFF_STRILE_ARRAY_MAX_RESIZE_COUNT");
+ uint32 max_nstrips = 1000000;
+ if( pszMax )
+ max_nstrips = (uint32) atoi(pszMax);
+ TIFFReadDirEntryOutputErr(tif,TIFFReadDirEntryErrCount,
+ module,
+ fip ? fip->field_name : "unknown tagname",
+ ( nstrips <= max_nstrips ) );
+
+ if( nstrips > max_nstrips )
+ {
+ _TIFFfree(data);
+ return(0);
+ }
+
resizeddata=(uint64*)_TIFFCheckMalloc(tif,nstrips,sizeof(uint64),"for strip array");
if (resizeddata==0) {
_TIFFfree(data);
return(0);
}
- if (dir->tdir_count<(uint64)nstrips)
- {
- _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
- _TIFFmemset(resizeddata+(uint32)dir->tdir_count,0,(nstrips-(uint32)dir->tdir_count)*sizeof(uint64));
- }
- else
- _TIFFmemcpy(resizeddata,data,nstrips*sizeof(uint64));
+ _TIFFmemcpy(resizeddata,data,(uint32)dir->tdir_count*sizeof(uint64));
+ _TIFFmemset(resizeddata+(uint32)dir->tdir_count,0,(nstrips-(uint32)dir->tdir_count)*sizeof(uint64));
_TIFFfree(data);
data=resizeddata;
}
@@ -5546,6 +5668,11 @@ ChopUpSingleUncompressedStrip(TIFF* tif)
uint64* newoffsets;
bytecount = td->td_stripbytecount[0];
+ /* On a newly created file, just re-opened to be filled, we */
+ /* don't want strip chop to trigger as it is going to cause issues */
+ /* later ( StripOffsets and StripByteCounts improperly filled) . */
+ if( bytecount == 0 && tif->tif_mode != O_RDONLY )
+ return;
offset = td->td_stripoffset[0];
assert(td->td_planarconfig == PLANARCONFIG_CONTIG);
if ((td->td_photometric == PHOTOMETRIC_YCBCR)&&
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-19 09:24:34 +0000