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* libtiff/tif_dirread.c: in TIFFCheckDirOffset(), avoid uint16 overflow

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when reading more than 65535 directories, and effectively error out when
reaching that limit.
This commit is contained in:
Even Rouault 2015-01-03 18:03:40 +00:00
parent 376ee1fc20
commit 7f884b953c
2 changed files with 16 additions and 2 deletions
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ChangeLog
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@ -1,3 +1,9 @@
2015-01-03 Even Rouault <even.rouault@spatialys.com>
* libtiff/tif_dirread.c: in TIFFCheckDirOffset(), avoid uint16 overflow
when reading more than 65535 directories, and effectively error out when
reaching that limit.
2014-12-29 Even Rouault <even.rouault@spatialys.com>
* libtiff/tif_jpeg.c: in JPEGFixupTags(), recognize SOF2, SOF9 and SOF10

12
libtiff/tif_dirread.c
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@ -1,4 +1,4 @@
/* $Id: tif_dirread.c,v 1.182 2014-12-23 11:06:54 erouault Exp $ */
/* $Id: tif_dirread.c,v 1.183 2015-01-03 18:03:40 erouault Exp $ */
/*
* Copyright (c) 1988-1997 Sam Leffler
@ -4395,6 +4395,11 @@ TIFFCheckDirOffset(TIFF* tif, uint64 diroff)
if (diroff == 0) /* no more directories */
return 0;
if (tif->tif_dirnumber == 65535) {
TIFFErrorExt(tif->tif_clientdata, "TIFFCheckDirOffset",
"Cannot handle more than 65535 TIFF directories");
return 0;
}
for (n = 0; n < tif->tif_dirnumber && tif->tif_dirlist; n++) {
if (tif->tif_dirlist[n] == diroff)
@ -4414,7 +4419,10 @@ TIFFCheckDirOffset(TIFF* tif, uint64 diroff)
tif->tif_dirnumber, 2 * sizeof(uint64), "for IFD list");
if (!new_dirlist)
return 0;
tif->tif_dirlistsize = 2 * tif->tif_dirnumber;
if( tif->tif_dirnumber >= 32768 )
tif->tif_dirlistsize = 65535;
else
tif->tif_dirlistsize = 2 * tif->tif_dirnumber;
tif->tif_dirlist = new_dirlist;
}