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ffmpeg/libavcodec/tiff.c
Anton Khirnov ae5e1f3d66 tiff: Check that there is no aliasing in pixel format selection 
Fixes possible issues with unexpected bpp/bppcount values.

CC: libav-stable@libav.org
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Bug-Id: CVE-2014-8544
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
2015-03-08 19:14:14 +01:00

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/*
* TIFF image decoder
* Copyright (c) 2006 Konstantin Shishkov
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* TIFF image decoder
* @author Konstantin Shishkov
*/
#include "config.h"
#if CONFIG_ZLIB
#include <zlib.h>
#endif
#include "libavutil/attributes.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/imgutils.h"
#include "avcodec.h"
#include "bytestream.h"
#include "faxcompr.h"
#include "internal.h"
#include "lzw.h"
#include "mathops.h"
#include "tiff.h"
typedef struct TiffContext {
AVCodecContext *avctx;
GetByteContext gb;
int width, height;
unsigned int bpp, bppcount;
uint32_t palette[256];
int palette_is_set;
int le;
enum TiffCompr compr;
enum TiffPhotometric photometric;
int planar;
int fax_opts;
int predictor;
int fill_order;
int strips, rps, sstype;
int sot;
int stripsizesoff, stripsize, stripoff, strippos;
LZWState *lzw;
} TiffContext;
static unsigned tget_short(GetByteContext *gb, int le)
{
return le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
}
static unsigned tget_long(GetByteContext *gb, int le)
{
return le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
}
static unsigned tget(GetByteContext *gb, int type, int le)
{
switch (type) {
case TIFF_BYTE: return bytestream2_get_byte(gb);
case TIFF_SHORT: return tget_short(gb, le);
case TIFF_LONG: return tget_long(gb, le);
default: return UINT_MAX;
}
}
#if CONFIG_ZLIB
static int tiff_uncompress(uint8_t *dst, unsigned long *len, const uint8_t *src,
int size)
{
z_stream zstream = { 0 };
int zret;
zstream.next_in = src;
zstream.avail_in = size;
zstream.next_out = dst;
zstream.avail_out = *len;
zret = inflateInit(&zstream);
if (zret != Z_OK) {
av_log(NULL, AV_LOG_ERROR, "Inflate init error: %d\n", zret);
return zret;
}
zret = inflate(&zstream, Z_SYNC_FLUSH);
inflateEnd(&zstream);
*len = zstream.total_out;
return zret == Z_STREAM_END ? Z_OK : zret;
}
static int tiff_unpack_zlib(TiffContext *s, uint8_t *dst, int stride,
const uint8_t *src, int size,
int width, int lines)
{
uint8_t *zbuf;
unsigned long outlen;
int ret, line;
outlen = width * lines;
zbuf = av_malloc(outlen);
if (!zbuf)
return AVERROR(ENOMEM);
ret = tiff_uncompress(zbuf, &outlen, src, size);
if (ret != Z_OK) {
av_log(s->avctx, AV_LOG_ERROR,
"Uncompressing failed (%lu of %lu) with error %d\n", outlen,
(unsigned long)width * lines, ret);
av_free(zbuf);
return AVERROR_UNKNOWN;
}
src = zbuf;
for (line = 0; line < lines; line++) {
memcpy(dst, src, width);
dst += stride;
src += width;
}
av_free(zbuf);
return 0;
}
#endif
static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,
const uint8_t *src, int size, int lines)
{
int i, ret = 0;
uint8_t *src2 = av_malloc((unsigned)size +
FF_INPUT_BUFFER_PADDING_SIZE);
if (!src2) {
av_log(s->avctx, AV_LOG_ERROR,
"Error allocating temporary buffer\n");
return AVERROR(ENOMEM);
}
if (s->fax_opts & 2) {
avpriv_request_sample(s->avctx, "Uncompressed fax mode");
av_free(src2);
return AVERROR_PATCHWELCOME;
}
if (!s->fill_order) {
memcpy(src2, src, size);
} else {
for (i = 0; i < size; i++)
src2[i] = ff_reverse[src[i]];
}
memset(src2 + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
ret = ff_ccitt_unpack(s->avctx, src2, size, dst, lines, stride,
s->compr, s->fax_opts);
av_free(src2);
return ret;
}
static int tiff_unpack_strip(TiffContext *s, uint8_t *dst, int stride,
const uint8_t *src, int size, int lines)
{
PutByteContext pb;
int c, line, pixels, code, ret;
int width = ((s->width * s->bpp) + 7) >> 3;
if (s->planar)
width /= s->bppcount;
if (size <= 0)
return AVERROR_INVALIDDATA;
if (s->compr == TIFF_DEFLATE || s->compr == TIFF_ADOBE_DEFLATE) {
#if CONFIG_ZLIB
return tiff_unpack_zlib(s, dst, stride, src, size, width, lines);
#else
av_log(s->avctx, AV_LOG_ERROR,
"zlib support not enabled, "
"deflate compression not supported\n");
return AVERROR(ENOSYS);
#endif
}
if (s->compr == TIFF_LZW) {
if ((ret = ff_lzw_decode_init(s->lzw, 8, src, size, FF_LZW_TIFF)) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "Error initializing LZW decoder\n");
return ret;
}
for (line = 0; line < lines; line++) {
pixels = ff_lzw_decode(s->lzw, dst, width);
if (pixels < width) {
av_log(s->avctx, AV_LOG_ERROR, "Decoded only %i bytes of %i\n",
pixels, width);
return AVERROR_INVALIDDATA;
}
dst += stride;
}
return 0;
}
if (s->compr == TIFF_CCITT_RLE ||
s->compr == TIFF_G3 ||
s->compr == TIFF_G4) {
return tiff_unpack_fax(s, dst, stride, src, size, lines);
}
bytestream2_init(&s->gb, src, size);
bytestream2_init_writer(&pb, dst, stride * lines);
for (line = 0; line < lines; line++) {
if (bytestream2_get_bytes_left(&s->gb) == 0 || bytestream2_get_eof(&pb))
break;
bytestream2_seek_p(&pb, stride * line, SEEK_SET);
switch (s->compr) {
case TIFF_RAW:
if (!s->fill_order) {
bytestream2_copy_buffer(&pb, &s->gb, width);
} else {
int i;
for (i = 0; i < width; i++)
bytestream2_put_byte(&pb, ff_reverse[bytestream2_get_byte(&s->gb)]);
}
break;
case TIFF_PACKBITS:
for (pixels = 0; pixels < width;) {
code = ff_u8_to_s8(bytestream2_get_byte(&s->gb));
if (code >= 0) {
code++;
bytestream2_copy_buffer(&pb, &s->gb, code);
pixels += code;
} else if (code != -128) { // -127..-1
code = (-code) + 1;
c = bytestream2_get_byte(&s->gb);
bytestream2_set_buffer(&pb, c, code);
pixels += code;
}
}
break;
}
}
return 0;
}
static int init_image(TiffContext *s, AVFrame *frame)
{
int ret;
// make sure there is no aliasing in the following switch
if (s->bpp >= 100 || s->bppcount >= 10) {
av_log(s->avctx, AV_LOG_ERROR,
"Unsupported image parameters: bpp=%d, bppcount=%d\n",
s->bpp, s->bppcount);
return AVERROR_INVALIDDATA;
}
switch (s->planar * 1000 + s->bpp * 10 + s->bppcount) {
case 11:
s->avctx->pix_fmt = AV_PIX_FMT_MONOBLACK;
break;
case 81:
s->avctx->pix_fmt = s->palette_is_set ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
break;
case 243:
s->avctx->pix_fmt = AV_PIX_FMT_RGB24;
break;
case 161:
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GRAY16LE : AV_PIX_FMT_GRAY16BE;
break;
case 162:
s->avctx->pix_fmt = AV_PIX_FMT_YA8;
break;
case 322:
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_YA16LE : AV_PIX_FMT_YA16BE;
break;
case 324:
s->avctx->pix_fmt = AV_PIX_FMT_RGBA;
break;
case 483:
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGB48LE : AV_PIX_FMT_RGB48BE;
break;
case 644:
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_RGBA64LE : AV_PIX_FMT_RGBA64BE;
break;
case 1243:
s->avctx->pix_fmt = AV_PIX_FMT_GBRP;
break;
case 1324:
s->avctx->pix_fmt = AV_PIX_FMT_GBRAP;
break;
case 1483:
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GBRP16LE : AV_PIX_FMT_GBRP16BE;
break;
case 1644:
s->avctx->pix_fmt = s->le ? AV_PIX_FMT_GBRAP16LE : AV_PIX_FMT_GBRAP16BE;
break;
default:
av_log(s->avctx, AV_LOG_ERROR,
"This format is not supported (bpp=%d, bppcount=%d)\n",
s->bpp, s->bppcount);
return AVERROR_INVALIDDATA;
}
if (s->width != s->avctx->width || s->height != s->avctx->height) {
ret = ff_set_dimensions(s->avctx, s->width, s->height);
if (ret < 0)
return ret;
}
if ((ret = ff_get_buffer(s->avctx, frame, 0)) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return ret;
}
if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
memcpy(frame->data[1], s->palette, sizeof(s->palette));
}
return 0;
}
static int tiff_decode_tag(TiffContext *s)
{
unsigned tag, type, count, off, value = 0;
int i, start;
if (bytestream2_get_bytes_left(&s->gb) < 12)
return AVERROR_INVALIDDATA;
tag = tget_short(&s->gb, s->le);
type = tget_short(&s->gb, s->le);
count = tget_long(&s->gb, s->le);
off = tget_long(&s->gb, s->le);
start = bytestream2_tell(&s->gb);
if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",
type);
return 0;
}
if (count == 1) {
switch (type) {
case TIFF_BYTE:
case TIFF_SHORT:
bytestream2_seek(&s->gb, -4, SEEK_CUR);
value = tget(&s->gb, type, s->le);
break;
case TIFF_LONG:
value = off;
break;
case TIFF_STRING:
if (count <= 4) {
bytestream2_seek(&s->gb, -4, SEEK_CUR);
break;
}
default:
value = UINT_MAX;
bytestream2_seek(&s->gb, off, SEEK_SET);
}
} else {
if (count <= 4 && type_sizes[type] * count <= 4)
bytestream2_seek(&s->gb, -4, SEEK_CUR);
else
bytestream2_seek(&s->gb, off, SEEK_SET);
}
switch (tag) {
case TIFF_WIDTH:
s->width = value;
break;
case TIFF_HEIGHT:
s->height = value;
break;
case TIFF_BPP:
s->bppcount = count;
if (count > 4) {
av_log(s->avctx, AV_LOG_ERROR,
"This format is not supported (bpp=%d, %d components)\n",
s->bpp, count);
return AVERROR_INVALIDDATA;
}
if (count == 1)
s->bpp = value;
else {
switch (type) {
case TIFF_BYTE:
s->bpp = (off & 0xFF) + ((off >> 8) & 0xFF) +
((off >> 16) & 0xFF) + ((off >> 24) & 0xFF);
break;
case TIFF_SHORT:
case TIFF_LONG:
s->bpp = 0;
for (i = 0; i < count; i++)
s->bpp += tget(&s->gb, type, s->le);
break;
default:
s->bpp = -1;
}
}
break;
case TIFF_SAMPLES_PER_PIXEL:
if (count != 1) {
av_log(s->avctx, AV_LOG_ERROR,
"Samples per pixel requires a single value, many provided\n");
return AVERROR_INVALIDDATA;
}
if (s->bppcount == 1)
s->bpp *= value;
s->bppcount = value;
break;
case TIFF_COMPR:
s->compr = value;
s->predictor = 0;
switch (s->compr) {
case TIFF_RAW:
case TIFF_PACKBITS:
case TIFF_LZW:
case TIFF_CCITT_RLE:
break;
case TIFF_G3:
case TIFF_G4:
s->fax_opts = 0;
break;
case TIFF_DEFLATE:
case TIFF_ADOBE_DEFLATE:
#if CONFIG_ZLIB
break;
#else
av_log(s->avctx, AV_LOG_ERROR, "Deflate: ZLib not compiled in\n");
return AVERROR(ENOSYS);
#endif
case TIFF_JPEG:
case TIFF_NEWJPEG:
avpriv_report_missing_feature(s->avctx, "JPEG compression");
return AVERROR_PATCHWELCOME;
case TIFF_LZMA:
avpriv_report_missing_feature(s->avctx, "LZMA compression");
return AVERROR_PATCHWELCOME;
default:
av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",
s->compr);
return AVERROR_INVALIDDATA;
}
break;
case TIFF_ROWSPERSTRIP:
if (!value || (type == TIFF_LONG && value == UINT_MAX))
value = s->height;
s->rps = FFMIN(value, s->height);
break;
case TIFF_STRIP_OFFS:
if (count == 1) {
s->strippos = 0;
s->stripoff = value;
} else
s->strippos = off;
s->strips = count;
if (s->strips == 1)
s->rps = s->height;
s->sot = type;
break;
case TIFF_STRIP_SIZE:
if (count == 1) {
s->stripsizesoff = 0;
s->stripsize = value;
s->strips = 1;
} else {
s->stripsizesoff = off;
}
s->strips = count;
s->sstype = type;
break;
case TIFF_PREDICTOR:
s->predictor = value;
break;
case TIFF_PHOTOMETRIC:
switch (value) {
case TIFF_PHOTOMETRIC_WHITE_IS_ZERO:
case TIFF_PHOTOMETRIC_BLACK_IS_ZERO:
case TIFF_PHOTOMETRIC_RGB:
case TIFF_PHOTOMETRIC_PALETTE:
s->photometric = value;
break;
case TIFF_PHOTOMETRIC_ALPHA_MASK:
case TIFF_PHOTOMETRIC_SEPARATED:
case TIFF_PHOTOMETRIC_YCBCR:
case TIFF_PHOTOMETRIC_CIE_LAB:
case TIFF_PHOTOMETRIC_ICC_LAB:
case TIFF_PHOTOMETRIC_ITU_LAB:
case TIFF_PHOTOMETRIC_CFA:
case TIFF_PHOTOMETRIC_LOG_L:
case TIFF_PHOTOMETRIC_LOG_LUV:
case TIFF_PHOTOMETRIC_LINEAR_RAW:
avpriv_report_missing_feature(s->avctx,
"PhotometricInterpretation 0x%04X",
value);
return AVERROR_PATCHWELCOME;
default:
av_log(s->avctx, AV_LOG_ERROR, "PhotometricInterpretation %u is "
"unknown\n", value);
return AVERROR_INVALIDDATA;
}
break;
case TIFF_FILL_ORDER:
if (value < 1 || value > 2) {
av_log(s->avctx, AV_LOG_ERROR,
"Unknown FillOrder value %d, trying default one\n", value);
value = 1;
}
s->fill_order = value - 1;
break;
case TIFF_PAL: {
GetByteContext pal_gb[3];
off = type_sizes[type];
if (count / 3 > 256 ||
bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
return AVERROR_INVALIDDATA;
pal_gb[0] = pal_gb[1] = pal_gb[2] = s->gb;
bytestream2_skip(&pal_gb[1], count / 3 * off);
bytestream2_skip(&pal_gb[2], count / 3 * off * 2);
off = (type_sizes[type] - 1) << 3;
for (i = 0; i < count / 3; i++) {
uint32_t p = 0xFF000000;
p |= (tget(&pal_gb[0], type, s->le) >> off) << 16;
p |= (tget(&pal_gb[1], type, s->le) >> off) << 8;
p |= tget(&pal_gb[2], type, s->le) >> off;
s->palette[i] = p;
}
s->palette_is_set = 1;
break;
}
case TIFF_PLANAR:
s->planar = value == 2;
break;
case TIFF_T4OPTIONS:
if (s->compr == TIFF_G3)
s->fax_opts = value;
break;
case TIFF_T6OPTIONS:
if (s->compr == TIFF_G4)
s->fax_opts = value;
break;
default:
if (s->avctx->err_recognition & AV_EF_EXPLODE) {
av_log(s->avctx, AV_LOG_ERROR,
"Unknown or unsupported tag %d/0X%0X\n",
tag, tag);
return AVERROR_INVALIDDATA;
}
}
bytestream2_seek(&s->gb, start, SEEK_SET);
return 0;
}
static int decode_frame(AVCodecContext *avctx,
void *data, int *got_frame, AVPacket *avpkt)
{
TiffContext *const s = avctx->priv_data;
AVFrame *const p = data;
unsigned off;
int id, le, ret, plane, planes;
int i, j, entries, stride;
unsigned soff, ssize;
uint8_t *dst;
GetByteContext stripsizes;
GetByteContext stripdata;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
// parse image header
if (avpkt->size < 8)
return AVERROR_INVALIDDATA;
id = bytestream2_get_le16(&s->gb);
if (id == 0x4949)
le = 1;
else if (id == 0x4D4D)
le = 0;
else {
av_log(avctx, AV_LOG_ERROR, "TIFF header not found\n");
return AVERROR_INVALIDDATA;
}
s->le = le;
s->photometric = TIFF_PHOTOMETRIC_NONE;
s->compr = TIFF_RAW;
s->fill_order = 0;
// As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
// that further identifies the file as a TIFF file"
if (tget_short(&s->gb, le) != 42) {
av_log(avctx, AV_LOG_ERROR,
"The answer to life, universe and everything is not correct!\n");
return AVERROR_INVALIDDATA;
}
// Reset these offsets so we can tell if they were set this frame
s->stripsizesoff = s->strippos = 0;
/* parse image file directory */
off = tget_long(&s->gb, le);
if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
return AVERROR_INVALIDDATA;
}
bytestream2_seek(&s->gb, off, SEEK_SET);
entries = tget_short(&s->gb, le);
for (i = 0; i < entries; i++) {
if ((ret = tiff_decode_tag(s)) < 0)
return ret;
}
if (!s->strippos && !s->stripoff) {
av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
return AVERROR_INVALIDDATA;
}
/* now we have the data and may start decoding */
if ((ret = init_image(s, p)) < 0)
return ret;
if (s->strips == 1 && !s->stripsize) {
av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
s->stripsize = avpkt->size - s->stripoff;
}
if (s->stripsizesoff) {
if (s->stripsizesoff >= avpkt->size)
return AVERROR_INVALIDDATA;
bytestream2_init(&stripsizes, avpkt->data + s->stripsizesoff,
avpkt->size - s->stripsizesoff);
}
if (s->strippos) {
if (s->strippos >= avpkt->size)
return AVERROR_INVALIDDATA;
bytestream2_init(&stripdata, avpkt->data + s->strippos,
avpkt->size - s->strippos);
}
planes = s->planar ? s->bppcount : 1;
for (plane = 0; plane < planes; plane++) {
stride = p->linesize[plane];
dst = p->data[plane];
for (i = 0; i < s->height; i += s->rps) {
if (s->stripsizesoff)
ssize = tget(&stripsizes, s->sstype, le);
else
ssize = s->stripsize;
if (s->strippos)
soff = tget(&stripdata, s->sot, le);
else
soff = s->stripoff;
if (soff > avpkt->size || ssize > avpkt->size - soff) {
av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
return AVERROR_INVALIDDATA;
}
if ((ret = tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,
FFMIN(s->rps, s->height - i))) < 0) {
if (avctx->err_recognition & AV_EF_EXPLODE)
return ret;
break;
}
dst += s->rps * stride;
}
if (s->predictor == 2) {
dst = p->data[plane];
soff = s->bpp >> 3;
ssize = s->width * soff;
if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48LE ||
s->avctx->pix_fmt == AV_PIX_FMT_RGBA64LE) {
for (i = 0; i < s->height; i++) {
for (j = soff; j < ssize; j += 2)
AV_WL16(dst + j, AV_RL16(dst + j) + AV_RL16(dst + j - soff));
dst += stride;
}
} else if (s->avctx->pix_fmt == AV_PIX_FMT_RGB48BE ||
s->avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {
for (i = 0; i < s->height; i++) {
for (j = soff; j < ssize; j += 2)
AV_WB16(dst + j, AV_RB16(dst + j) + AV_RB16(dst + j - soff));
dst += stride;
}
} else {
for (i = 0; i < s->height; i++) {
for (j = soff; j < ssize; j++)
dst[j] += dst[j - soff];
dst += stride;
}
}
}
if (s->photometric == TIFF_PHOTOMETRIC_WHITE_IS_ZERO) {
dst = p->data[plane];
for (i = 0; i < s->height; i++) {
for (j = 0; j < stride; j++)
dst[j] = 255 - dst[j];
dst += stride;
}
}
}
if (s->planar && s->bppcount > 2) {
FFSWAP(uint8_t*, p->data[0], p->data[2]);
FFSWAP(int, p->linesize[0], p->linesize[2]);
FFSWAP(uint8_t*, p->data[0], p->data[1]);
FFSWAP(int, p->linesize[0], p->linesize[1]);
}
*got_frame = 1;
return avpkt->size;
}
static av_cold int tiff_init(AVCodecContext *avctx)
{
TiffContext *s = avctx->priv_data;
s->width = 0;
s->height = 0;
s->avctx = avctx;
ff_lzw_decode_open(&s->lzw);
ff_ccitt_unpack_init();
return 0;
}
static av_cold int tiff_end(AVCodecContext *avctx)
{
TiffContext *const s = avctx->priv_data;
ff_lzw_decode_close(&s->lzw);
return 0;
}
AVCodec ff_tiff_decoder = {
.name = "tiff",
.long_name = NULL_IF_CONFIG_SMALL("TIFF image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TIFF,
.priv_data_size = sizeof(TiffContext),
.init = tiff_init,
.close = tiff_end,
.decode = decode_frame,
.capabilities = CODEC_CAP_DR1,
};
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