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More fixes for vulnerabilities, reported in Gentoo bug ():

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http://bugs.gentoo.org/show_bug.cgi?id=142383
This commit is contained in:
Andrey Kiselev 2006-10-12 15:36:14 +00:00
parent 8e71c5aa08
commit 8eebc4b8d8
1 changed files with 74 additions and 35 deletions
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67
libtiff/tif_jpeg.c
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@ -1,4 +1,4 @@
/* $Id: tif_jpeg.c,v 1.48 2006-03-29 22:24:44 fwarmerdam Exp $ */
/* $Id: tif_jpeg.c,v 1.49 2006-10-12 15:36:14 dron Exp $ */
/*
* Copyright (c) 1994-1997 Sam Leffler
@ -722,15 +722,30 @@ JPEGPreDecode(TIFF* tif, tsample_t s)
segment_width = TIFFhowmany(segment_width, sp->h_sampling);
segment_height = TIFFhowmany(segment_height, sp->v_sampling);
}
if (sp->cinfo.d.image_width != segment_width ||
sp->cinfo.d.image_height != segment_height) {
if (sp->cinfo.d.image_width < segment_width ||
sp->cinfo.d.image_height < segment_height) {
TIFFWarningExt(tif->tif_clientdata, module,
"Improper JPEG strip/tile size, expected %dx%d, got %dx%d",
segment_width,
segment_height,
"Improper JPEG strip/tile size, "
"expected %dx%d, got %dx%d",
segment_width, segment_height,
sp->cinfo.d.image_width,
sp->cinfo.d.image_height);
}
if (sp->cinfo.d.image_width > segment_width ||
sp->cinfo.d.image_height > segment_height) {
/*
* This case could be dangerous, if the strip or tile size has
* been reported as less than the amount of data jpeg will
* return, some potential security issues arise. Catch this
* case and error out.
*/
TIFFErrorExt(tif->tif_clientdata, module,
"JPEG strip/tile size exceeds expected dimensions,"
" expected %dx%d, got %dx%d",
segment_width, segment_height,
sp->cinfo.d.image_width, sp->cinfo.d.image_height);
return (0);
}
if (sp->cinfo.d.num_components !=
(td->td_planarconfig == PLANARCONFIG_CONTIG ?
td->td_samplesperpixel : 1)) {
@ -761,6 +776,24 @@ JPEGPreDecode(TIFF* tif, tsample_t s)
sp->cinfo.d.comp_info[0].v_samp_factor,
sp->h_sampling, sp->v_sampling);
/*
* There are potential security issues here
* for decoders that have already allocated
* buffers based on the expected sampling
* factors. Lets check the sampling factors
* dont exceed what we were expecting.
*/
if (sp->cinfo.d.comp_info[0].h_samp_factor
> sp->h_sampling
|| sp->cinfo.d.comp_info[0].v_samp_factor
> sp->v_sampling) {
TIFFErrorExt(tif->tif_clientdata,
module,
"Cannot honour JPEG sampling factors"
" that exceed those specified.");
return (0);
}
/*
* XXX: Files written by the Intergraph software
* has different sampling factors stored in the
@ -1552,9 +1585,9 @@ JPEGResetUpsampled( TIFF* tif )
TIFFDirectory* td = &tif->tif_dir;
/*
* Mark whether returned data is up-sampled or not
* so TIFFStripSize and TIFFTileSize return values
* that reflect the true amount of data.
* Mark whether returned data is up-sampled or not so TIFFStripSize
* and TIFFTileSize return values that reflect the true amount of
* data.
*/
tif->tif_flags &= ~TIFF_UPSAMPLED;
if (td->td_planarconfig == PLANARCONFIG_CONTIG) {
@ -1571,9 +1604,7 @@ JPEGResetUpsampled( TIFF* tif )
}
/*
* Must recalculate cached tile size
* in case sampling state changed.
*
* Must recalculate cached tile size in case sampling state changed.
* Should we really be doing this now if image size isn't set?
*/
tif->tif_tilesize = isTiled(tif) ? TIFFTileSize(tif) : (tsize_t) -1;
@ -1583,6 +1614,7 @@ static int
JPEGVSetField(TIFF* tif, ttag_t tag, va_list ap)
{
JPEGState* sp = JState(tif);
const TIFFFieldInfo* fip;
uint32 v32;
assert(sp != NULL);
@ -1635,7 +1667,13 @@ JPEGVSetField(TIFF* tif, ttag_t tag, va_list ap)
default:
return (*sp->vsetparent)(tif, tag, ap);
}
TIFFSetFieldBit(tif, _TIFFFieldWithTag(tif, tag)->field_bit);
if ((fip = _TIFFFieldWithTag(tif, tag))) {
TIFFSetFieldBit(tif, fip->field_bit);
} else {
return (0);
}
tif->tif_flags |= TIFF_DIRTYDIRECT;
return (1);
}
@ -1824,7 +1862,7 @@ static int JPEGInitializeLibJPEG( TIFF * tif, int force_encode, int force_decode
int data_is_empty = TRUE;
int decompress;
if( sp->cinfo_initialized )
if(sp->cinfo_initialized)
return 1;
/*
@ -1968,3 +2006,4 @@ TIFFInitJPEG(TIFF* tif, int scheme)
#endif /* JPEG_SUPPORT */
/* vim: set ts=8 sts=8 sw=8 noet: */