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2015-12-26 Even Rouault <even.rouault at spatialys.com>
* libtiff/tif_getimage.c: fix out-of-bound reads in TIFFRGBAImage
interface in case of unsupported values of SamplesPerPixel/ExtraSamples
for LogLUV / CIELab. Add explicit call to TIFFRGBAImageOK() in
TIFFRGBAImageBegin(). Fix CVE-2015-8665 reported by limingxing and
CVE-2015-8683 reported by zzf of Alibaba.
diff -u -r1.93 -r1.94
--- libtiff/libtiff/tif_getimage.c 22 Nov 2015 15:31:03 -0000 1.93
+++ libtiff/libtiff/tif_getimage.c 26 Dec 2015 17:32:03 -0000 1.94
@@ -182,20 +182,22 @@
"Planarconfiguration", td->td_planarconfig);
return (0);
}
- if( td->td_samplesperpixel != 3 )
+ if( td->td_samplesperpixel != 3 || colorchannels != 3 )
{
sprintf(emsg,
- "Sorry, can not handle image with %s=%d",
- "Samples/pixel", td->td_samplesperpixel);
+ "Sorry, can not handle image with %s=%d, %s=%d",
+ "Samples/pixel", td->td_samplesperpixel,
+ "colorchannels", colorchannels);
return 0;
}
break;
case PHOTOMETRIC_CIELAB:
- if( td->td_samplesperpixel != 3 || td->td_bitspersample != 8 )
+ if( td->td_samplesperpixel != 3 || colorchannels != 3 || td->td_bitspersample != 8 )
{
sprintf(emsg,
- "Sorry, can not handle image with %s=%d and %s=%d",
+ "Sorry, can not handle image with %s=%d, %s=%d and %s=%d",
"Samples/pixel", td->td_samplesperpixel,
+ "colorchannels", colorchannels,
"Bits/sample", td->td_bitspersample);
return 0;
}
@@ -255,6 +257,9 @@
int colorchannels;
uint16 *red_orig, *green_orig, *blue_orig;
int n_color;
+
+ if( !TIFFRGBAImageOK(tif, emsg) )
+ return 0;
/* Initialize to normal values */
img->row_offset = 0;
@@ -2509,29 +2514,33 @@
case PHOTOMETRIC_RGB:
switch (img->bitspersample) {
case 8:
- if (img->alpha == EXTRASAMPLE_ASSOCALPHA)
+ if (img->alpha == EXTRASAMPLE_ASSOCALPHA &&
+ img->samplesperpixel >= 4)
img->put.contig = putRGBAAcontig8bittile;
- else if (img->alpha == EXTRASAMPLE_UNASSALPHA)
+ else if (img->alpha == EXTRASAMPLE_UNASSALPHA &&
+ img->samplesperpixel >= 4)
{
if (BuildMapUaToAa(img))
img->put.contig = putRGBUAcontig8bittile;
}
- else
+ else if( img->samplesperpixel >= 3 )
img->put.contig = putRGBcontig8bittile;
break;
case 16:
- if (img->alpha == EXTRASAMPLE_ASSOCALPHA)
+ if (img->alpha == EXTRASAMPLE_ASSOCALPHA &&
+ img->samplesperpixel >=4 )
{
if (BuildMapBitdepth16To8(img))
img->put.contig = putRGBAAcontig16bittile;
}
- else if (img->alpha == EXTRASAMPLE_UNASSALPHA)
+ else if (img->alpha == EXTRASAMPLE_UNASSALPHA &&
+ img->samplesperpixel >=4 )
{
if (BuildMapBitdepth16To8(img) &&
BuildMapUaToAa(img))
img->put.contig = putRGBUAcontig16bittile;
}
- else
+ else if( img->samplesperpixel >=3 )
{
if (BuildMapBitdepth16To8(img))
img->put.contig = putRGBcontig16bittile;
@@ -2540,7 +2549,7 @@
}
break;
case PHOTOMETRIC_SEPARATED:
- if (buildMap(img)) {
+ if (img->samplesperpixel >=4 && buildMap(img)) {
if (img->bitspersample == 8) {
if (!img->Map)
img->put.contig = putRGBcontig8bitCMYKtile;
@@ -2636,7 +2645,7 @@
}
break;
case PHOTOMETRIC_CIELAB:
- if (buildMap(img)) {
+ if (img->samplesperpixel == 3 && buildMap(img)) {
if (img->bitspersample == 8)
img->put.contig = initCIELabConversion(img);
break;
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