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From 49723b0eb683cca80142b01a48ba1475fed5188a Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Nikola=20Forr=C3=B3?= <nforro@redhat.com>
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Date: Fri, 23 Mar 2018 15:35:39 +0100
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Subject: [PATCH] Fix for bug 2772
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It is possible to craft a TIFF document where the IFD list is circular,
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leading to an infinite loop while traversing the chain. The libtiff
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directory reader has a failsafe that will break out of this loop after
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reading 65535 directory entries, but it will continue processing,
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consuming time and resources to process what is essentially a bogus TIFF
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document.
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This change fixes the above behavior by breaking out of processing when
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a TIFF document has >= 65535 directories and terminating with an error.
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---
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contrib/addtiffo/tif_overview.c | 14 +++++++++++++-
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tools/tiff2pdf.c | 10 ++++++++++
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tools/tiffcrop.c | 13 +++++++++++--
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3 files changed, 34 insertions(+), 3 deletions(-)
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diff --git a/contrib/addtiffo/tif_overview.c b/contrib/addtiffo/tif_overview.c
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index c61ffbb..03b3573 100644
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--- a/contrib/addtiffo/tif_overview.c
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+++ b/contrib/addtiffo/tif_overview.c
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@@ -65,6 +65,8 @@
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# define MAX(a,b) ((a>b) ? a : b)
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#endif
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+#define TIFF_DIR_MAX 65534
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+
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void TIFFBuildOverviews( TIFF *, int, int *, int, const char *,
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int (*)(double,void*), void * );
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@@ -91,6 +93,7 @@ uint32 TIFF_WriteOverview( TIFF *hTIFF, uint32 nXSize, uint32 nYSize,
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{
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toff_t nBaseDirOffset;
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toff_t nOffset;
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+ tdir_t iNumDir;
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(void) bUseSubIFDs;
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@@ -147,7 +150,16 @@ uint32 TIFF_WriteOverview( TIFF *hTIFF, uint32 nXSize, uint32 nYSize,
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return 0;
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TIFFWriteDirectory( hTIFF );
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- TIFFSetDirectory( hTIFF, (tdir_t) (TIFFNumberOfDirectories(hTIFF)-1) );
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+ iNumDir = TIFFNumberOfDirectories(hTIFF);
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+ if( iNumDir > TIFF_DIR_MAX )
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+ {
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+ TIFFErrorExt( TIFFClientdata(hTIFF),
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+ "TIFF_WriteOverview",
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+ "File `%s' has too many directories.\n",
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+ TIFFFileName(hTIFF) );
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+ exit(-1);
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+ }
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+ TIFFSetDirectory( hTIFF, (tdir_t) (iNumDir - 1) );
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nOffset = TIFFCurrentDirOffset( hTIFF );
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diff --git a/tools/tiff2pdf.c b/tools/tiff2pdf.c
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index 454befb..bdb9126 100644
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--- a/tools/tiff2pdf.c
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+++ b/tools/tiff2pdf.c
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@@ -68,6 +68,8 @@ extern int getopt(int, char**, char*);
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#define PS_UNIT_SIZE 72.0F
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+#define TIFF_DIR_MAX 65534
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+
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/* This type is of PDF color spaces. */
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typedef enum {
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T2P_CS_BILEVEL = 0x01, /* Bilevel, black and white */
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@@ -1049,6 +1051,14 @@ void t2p_read_tiff_init(T2P* t2p, TIFF* input){
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uint16 xuint16=0;
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directorycount=TIFFNumberOfDirectories(input);
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+ if(directorycount > TIFF_DIR_MAX) {
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+ TIFFError(
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+ TIFF2PDF_MODULE,
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+ "TIFF contains too many directories, %s",
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+ TIFFFileName(input));
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+ t2p->t2p_error = T2P_ERR_ERROR;
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+ return;
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+ }
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t2p->tiff_pages = (T2P_PAGE*) _TIFFmalloc(TIFFSafeMultiply(tmsize_t,directorycount,sizeof(T2P_PAGE)));
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if(t2p->tiff_pages==NULL){
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TIFFError(
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diff --git a/tools/tiffcrop.c b/tools/tiffcrop.c
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index c69177e..c60cb38 100644
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--- a/tools/tiffcrop.c
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+++ b/tools/tiffcrop.c
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@@ -217,6 +217,8 @@ extern int getopt(int argc, char * const argv[], const char *optstring);
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#define DUMP_TEXT 1
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#define DUMP_RAW 2
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+#define TIFF_DIR_MAX 65534
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+
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/* Offsets into buffer for margins and fixed width and length segments */
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struct offset {
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uint32 tmargin;
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@@ -2233,7 +2235,7 @@ main(int argc, char* argv[])
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pageNum = -1;
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else
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total_images = 0;
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- /* read multiple input files and write to output file(s) */
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+ /* Read multiple input files and write to output file(s) */
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while (optind < argc - 1)
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{
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in = TIFFOpen (argv[optind], "r");
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@@ -2241,7 +2243,14 @@ main(int argc, char* argv[])
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return (-3);
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/* If only one input file is specified, we can use directory count */
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- total_images = TIFFNumberOfDirectories(in);
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+ total_images = TIFFNumberOfDirectories(in);
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+ if (total_images > TIFF_DIR_MAX)
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+ {
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+ TIFFError (TIFFFileName(in), "File contains too many directories");
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+ if (out != NULL)
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+ (void) TIFFClose(out);
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+ return (1);
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+ }
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if (image_count == 0)
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{
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dirnum = 0;
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--
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2.13.6
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