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tiff: port to bytestream2

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Prevents out of array reads.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol
2012-07-15 20:58:13 +00:00
parent 6dac8c8327
commit 1ec83d9a9e
1 changed files with 112 additions and 106 deletions
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218
libavcodec/tiff.c
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@@ -25,6 +25,7 @@
*/ */
#include "avcodec.h" #include "avcodec.h"
#include "bytestream.h"
#if CONFIG_ZLIB #if CONFIG_ZLIB
#include <zlib.h> #include <zlib.h>
#endif #endif
@@ -40,6 +41,7 @@
typedef struct TiffContext { typedef struct TiffContext {
AVCodecContext *avctx; AVCodecContext *avctx;
AVFrame picture; AVFrame picture;
GetByteContext gb;
int width, height; int width, height;
unsigned int bpp, bppcount; unsigned int bpp, bppcount;
@@ -54,42 +56,37 @@ typedef struct TiffContext {
int strips, rps, sstype; int strips, rps, sstype;
int sot; int sot;
const uint8_t *stripdata; int stripsizesoff, stripsize, stripoff, strippos;
const uint8_t *stripsizes;
int stripsize, stripoff;
LZWState *lzw; LZWState *lzw;
int geotag_count; int geotag_count;
TiffGeoTag *geotags; TiffGeoTag *geotags;
} TiffContext; } TiffContext;
static unsigned tget_short(const uint8_t **p, int le) static unsigned tget_short(GetByteContext *gb, int le)
{ {
unsigned v = le ? AV_RL16(*p) : AV_RB16(*p); unsigned v = le ? bytestream2_get_le16(gb) : bytestream2_get_be16(gb);
*p += 2;
return v; return v;
} }
static unsigned tget_long(const uint8_t **p, int le) static unsigned tget_long(GetByteContext *gb, int le)
{ {
unsigned v = le ? AV_RL32(*p) : AV_RB32(*p); unsigned v = le ? bytestream2_get_le32(gb) : bytestream2_get_be32(gb);
*p += 4;
return v; return v;
} }
static double tget_double(const uint8_t **p, int le) static double tget_double(GetByteContext *gb, int le)
{ {
av_alias64 i = { .u64 = le ? AV_RL64(*p) : AV_RB64(*p)}; av_alias64 i = { .u64 = le ? bytestream2_get_le64(gb) : bytestream2_get_be64(gb)};
*p += 8;
return i.f64; return i.f64;
} }
static unsigned tget(const uint8_t **p, int type, int le) static unsigned tget(GetByteContext *gb, int type, int le)
{ {
switch (type) { switch (type) {
case TIFF_BYTE : return *(*p)++; case TIFF_BYTE : return bytestream2_get_byte(gb);
case TIFF_SHORT: return tget_short(p, le); case TIFF_SHORT: return tget_short(gb, le);
case TIFF_LONG : return tget_long(p, le); case TIFF_LONG : return tget_long(gb, le);
default : return UINT_MAX; default : return UINT_MAX;
} }
} }
@@ -223,7 +220,7 @@ static char *doubles2str(double *dp, int count, const char *sep)
return ap0; return ap0;
} }
static char *shorts2str(int *sp, int count, const char *sep) static char *shorts2str(int16_t *sp, int count, const char *sep)
{ {
int i; int i;
char *ap, *ap0; char *ap, *ap0;
@@ -241,18 +238,23 @@ static char *shorts2str(int *sp, int count, const char *sep)
return ap0; return ap0;
} }
static int add_doubles_metadata(const uint8_t **buf, int count, static int add_doubles_metadata(int count,
const char *name, const char *sep, const char *name, const char *sep,
TiffContext *s) TiffContext *s)
{ {
char *ap; char *ap;
int i; int i;
double *dp = av_malloc(count * sizeof(double)); double *dp;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int64_t))
return -1;
dp = av_malloc(count * sizeof(double));
if (!dp) if (!dp)
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
for (i = 0; i < count; i++) for (i = 0; i < count; i++)
dp[i] = tget_double(buf, s->le); dp[i] = tget_double(&s->gb, s->le);
ap = doubles2str(dp, count, sep); ap = doubles2str(dp, count, sep);
av_freep(&dp); av_freep(&dp);
if (!ap) if (!ap)
@@ -261,17 +263,22 @@ static int add_doubles_metadata(const uint8_t **buf, int count,
return 0; return 0;
} }
static int add_shorts_metadata(const uint8_t **buf, int count, const char *name, static int add_shorts_metadata(int count, const char *name,
const char *sep, TiffContext *s) const char *sep, TiffContext *s)
{ {
char *ap; char *ap;
int i; int i;
int *sp = av_malloc(count * sizeof(int)); int16_t *sp;
if (bytestream2_get_bytes_left(&s->gb) < count * sizeof(int16_t))
return -1;
sp = av_malloc(count * sizeof(int16_t));
if (!sp) if (!sp)
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
for (i = 0; i < count; i++) for (i = 0; i < count; i++)
sp[i] = tget_short(buf, s->le); sp[i] = tget_short(&s->gb, s->le);
ap = shorts2str(sp, count, sep); ap = shorts2str(sp, count, sep);
av_freep(&sp); av_freep(&sp);
if (!ap) if (!ap)
@@ -280,12 +287,12 @@ static int add_shorts_metadata(const uint8_t **buf, int count, const char *name,
return 0; return 0;
} }
static int add_metadata(const uint8_t **buf, int count, int type, static int add_metadata(int count, int type,
const char *name, const char *sep, TiffContext *s) const char *name, const char *sep, TiffContext *s)
{ {
switch(type) { switch(type) {
case TIFF_DOUBLE: return add_doubles_metadata(buf, count, name, sep, s); case TIFF_DOUBLE: return add_doubles_metadata(count, name, sep, s);
case TIFF_SHORT : return add_shorts_metadata(buf, count, name, sep, s); case TIFF_SHORT : return add_shorts_metadata(count, name, sep, s);
default : return AVERROR_INVALIDDATA; default : return AVERROR_INVALIDDATA;
}; };
} }
@@ -575,22 +582,21 @@ static int init_image(TiffContext *s)
return 0; return 0;
} }
static int tiff_decode_tag(TiffContext *s, const uint8_t *start, static int tiff_decode_tag(TiffContext *s)
const uint8_t *buf, const uint8_t *end_buf)
{ {
unsigned tag, type, count, off, value = 0; unsigned tag, type, count, off, value = 0;
int i, j; int i, j, k, pos, start;
int ret; int ret;
uint32_t *pal; uint32_t *pal;
const uint8_t *rp, *gp, *bp;
double *dp; double *dp;
if (end_buf - buf < 12) if (bytestream2_get_bytes_left(&s->gb) < 12)
return -1; return -1;
tag = tget_short(&buf, s->le); tag = tget_short(&s->gb, s->le);
type = tget_short(&buf, s->le); type = tget_short(&s->gb, s->le);
count = tget_long(&buf, s->le); count = tget_long(&s->gb, s->le);
off = tget_long(&buf, s->le); off = tget_long(&s->gb, s->le);
start = bytestream2_tell(&s->gb);
if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) { if (type == 0 || type >= FF_ARRAY_ELEMS(type_sizes)) {
av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n", av_log(s->avctx, AV_LOG_DEBUG, "Unknown tiff type (%u) encountered\n",
@@ -602,37 +608,29 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
switch (type) { switch (type) {
case TIFF_BYTE: case TIFF_BYTE:
case TIFF_SHORT: case TIFF_SHORT:
buf -= 4; bytestream2_seek(&s->gb, -4, SEEK_CUR);
value = tget(&buf, type, s->le); value = tget(&s->gb, type, s->le);
buf = NULL;
break; break;
case TIFF_LONG: case TIFF_LONG:
value = off; value = off;
buf = NULL;
break; break;
case TIFF_STRING: case TIFF_STRING:
if (count <= 4) { if (count <= 4) {
buf -= 4; bytestream2_seek(&s->gb, -4, SEEK_CUR);
break; break;
} }
default: default:
value = UINT_MAX; value = UINT_MAX;
buf = start + off; bytestream2_seek(&s->gb, off, SEEK_SET);
} }
} else { } else {
if (count <= 4 && type_sizes[type] * count <= 4) { if (count <= 4 && type_sizes[type] * count <= 4) {
buf -= 4; bytestream2_seek(&s->gb, -4, SEEK_CUR);
} else { } else {
buf = start + off; bytestream2_seek(&s->gb, off, SEEK_SET);
} }
} }
if (buf && (buf < start || buf > end_buf)) {
av_log(s->avctx, AV_LOG_ERROR,
"Tag referencing position outside the image\n");
return -1;
}
switch (tag) { switch (tag) {
case TIFF_WIDTH: case TIFF_WIDTH:
s->width = value; s->width = value;
@@ -659,8 +657,8 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
case TIFF_SHORT: case TIFF_SHORT:
case TIFF_LONG: case TIFF_LONG:
s->bpp = 0; s->bpp = 0;
for (i = 0; i < count && buf < end_buf; i++) for (i = 0; i < count && bytestream2_get_bytes_left(&s->gb) > 0; i++)
s->bpp += tget(&buf, type, s->le); s->bpp += tget(&s->gb, type, s->le);
break; break;
default: default:
s->bpp = -1; s->bpp = -1;
@@ -721,15 +719,15 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
break; break;
case TIFF_STRIP_OFFS: case TIFF_STRIP_OFFS:
if (count == 1) { if (count == 1) {
s->stripdata = NULL; s->strippos = 0;
s->stripoff = value; s->stripoff = value;
} else } else
s->stripdata = start + off; s->strippos = off;
s->strips = count; s->strips = count;
if (s->strips == 1) if (s->strips == 1)
s->rps = s->height; s->rps = s->height;
s->sot = type; s->sot = type;
if (s->stripdata > end_buf) { if (s->strippos > bytestream2_size(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, av_log(s->avctx, AV_LOG_ERROR,
"Tag referencing position outside the image\n"); "Tag referencing position outside the image\n");
return -1; return -1;
@@ -737,15 +735,15 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
break; break;
case TIFF_STRIP_SIZE: case TIFF_STRIP_SIZE:
if (count == 1) { if (count == 1) {
s->stripsizes = NULL; s->stripsizesoff = 0;
s->stripsize = value; s->stripsize = value;
s->strips = 1; s->strips = 1;
} else { } else {
s->stripsizes = start + off; s->stripsizesoff = off;
} }
s->strips = count; s->strips = count;
s->sstype = type; s->sstype = type;
if (s->stripsizes > end_buf) { if (s->stripsizesoff > bytestream2_size(&s->gb)) {
av_log(s->avctx, AV_LOG_ERROR, av_log(s->avctx, AV_LOG_ERROR,
"Tag referencing position outside the image\n"); "Tag referencing position outside the image\n");
return -1; return -1;
@@ -789,18 +787,16 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
case TIFF_PAL: case TIFF_PAL:
pal = (uint32_t *) s->palette; pal = (uint32_t *) s->palette;
off = type_sizes[type]; off = type_sizes[type];
if (count / 3 > 256 || end_buf - buf < count / 3 * off * 3) if (count / 3 > 256 || bytestream2_get_bytes_left(&s->gb) < count / 3 * off * 3)
return -1; return -1;
rp = buf;
gp = buf + count / 3 * off;
bp = buf + count / 3 * off * 2;
off = (type_sizes[type] - 1) << 3; off = (type_sizes[type] - 1) << 3;
for (i = 0; i < count / 3; i++) { for (k = 2; k >= 0; k--) {
j = 0xff << 24; for (i = 0; i < count / 3; i++) {
j |= (tget(&rp, type, s->le) >> off) << 16; if (k == 2)
j |= (tget(&gp, type, s->le) >> off) << 8; pal[i] = 0xff << 24;
j |= tget(&bp, type, s->le) >> off; j = (tget(&s->gb, type, s->le) >> off) << (k * 8);
pal[i] = j; pal[i] |= j;
}
} }
s->palette_is_set = 1; s->palette_is_set = 1;
break; break;
@@ -819,7 +815,7 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
s->fax_opts = value; s->fax_opts = value;
break; break;
#define ADD_METADATA(count, name, sep)\ #define ADD_METADATA(count, name, sep)\
if (ret = add_metadata(&buf, count, type, name, sep, s) < 0) {\ if (ret = add_metadata(count, type, name, sep, s) < 0) {\
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");\ av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");\
return ret;\ return ret;\
} }
@@ -835,7 +831,7 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
case TIFF_GEO_KEY_DIRECTORY: case TIFF_GEO_KEY_DIRECTORY:
ADD_METADATA(1, "GeoTIFF_Version", NULL); ADD_METADATA(1, "GeoTIFF_Version", NULL);
ADD_METADATA(2, "GeoTIFF_Key_Revision", "."); ADD_METADATA(2, "GeoTIFF_Key_Revision", ".");
s->geotag_count = tget_short(&buf, s->le); s->geotag_count = tget_short(&s->gb, s->le);
if (s->geotag_count > count / 4 - 1) { if (s->geotag_count > count / 4 - 1) {
s->geotag_count = count / 4 - 1; s->geotag_count = count / 4 - 1;
av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n"); av_log(s->avctx, AV_LOG_WARNING, "GeoTIFF key directory buffer shorter than specified\n");
@@ -846,14 +842,14 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
} }
for (i = 0; i < s->geotag_count; i++) { for (i = 0; i < s->geotag_count; i++) {
s->geotags[i].key = tget_short(&buf, s->le); s->geotags[i].key = tget_short(&s->gb, s->le);
s->geotags[i].type = tget_short(&buf, s->le); s->geotags[i].type = tget_short(&s->gb, s->le);
s->geotags[i].count = tget_short(&buf, s->le); s->geotags[i].count = tget_short(&s->gb, s->le);
if (!s->geotags[i].type) if (!s->geotags[i].type)
s->geotags[i].val = get_geokey_val(s->geotags[i].key, tget_short(&buf, s->le)); s->geotags[i].val = get_geokey_val(s->geotags[i].key, tget_short(&s->gb, s->le));
else else
s->geotags[i].offset = tget_short(&buf, s->le); s->geotags[i].offset = tget_short(&s->gb, s->le);
} }
break; break;
case TIFF_GEO_DOUBLE_PARAMS: case TIFF_GEO_DOUBLE_PARAMS:
@@ -863,7 +859,7 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
} }
for (i = 0; i < count; i++) for (i = 0; i < count; i++)
dp[i] = tget_double(&buf, s->le); dp[i] = tget_double(&s->gb, s->le);
for (i = 0; i < s->geotag_count; i++) { for (i = 0; i < s->geotag_count; i++) {
if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) { if (s->geotags[i].type == TIFF_GEO_DOUBLE_PARAMS) {
if (s->geotags[i].count == 0 if (s->geotags[i].count == 0
@@ -883,6 +879,7 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
av_freep(&dp); av_freep(&dp);
break; break;
case TIFF_GEO_ASCII_PARAMS: case TIFF_GEO_ASCII_PARAMS:
pos = bytestream2_tell(&s->gb);
for (i = 0; i < s->geotag_count; i++) { for (i = 0; i < s->geotag_count; i++) {
if (s->geotags[i].type == TIFF_GEO_ASCII_PARAMS) { if (s->geotags[i].type == TIFF_GEO_ASCII_PARAMS) {
if (s->geotags[i].count == 0 if (s->geotags[i].count == 0
@@ -894,7 +891,8 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n"); av_log(s->avctx, AV_LOG_ERROR, "Error allocating temporary buffer\n");
return AVERROR(ENOMEM); return AVERROR(ENOMEM);
} }
memcpy(ap, &buf[s->geotags[i].offset], s->geotags[i].count); bytestream2_seek(&s->gb, pos + s->geotags[i].offset, SEEK_SET);
bytestream2_get_buffer(&s->gb, ap, s->geotags[i].count);
ap[s->geotags[i].count - 1] = '\0'; //replace the "|" delimiter with a 0 byte ap[s->geotags[i].count - 1] = '\0'; //replace the "|" delimiter with a 0 byte
s->geotags[i].val = ap; s->geotags[i].val = ap;
} }
@@ -905,30 +903,31 @@ static int tiff_decode_tag(TiffContext *s, const uint8_t *start,
av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n", av_log(s->avctx, AV_LOG_DEBUG, "Unknown or unsupported tag %d/0X%0X\n",
tag, tag); tag, tag);
} }
bytestream2_seek(&s->gb, start, SEEK_SET);
return 0; return 0;
} }
static int decode_frame(AVCodecContext *avctx, static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size, AVPacket *avpkt) void *data, int *data_size, AVPacket *avpkt)
{ {
const uint8_t *buf = avpkt->data;
int buf_size = avpkt->size;
TiffContext *const s = avctx->priv_data; TiffContext *const s = avctx->priv_data;
AVFrame *picture = data; AVFrame *picture = data;
AVFrame *const p = &s->picture; AVFrame *const p = &s->picture;
const uint8_t *orig_buf = buf, *end_buf = buf + buf_size;
unsigned off; unsigned off;
int id, le, ret; int id, le, ret;
int i, j, entries; int i, j, entries;
int stride; int stride;
unsigned soff, ssize; unsigned soff, ssize;
uint8_t *dst; uint8_t *dst;
GetByteContext stripsizes;
GetByteContext stripdata;
bytestream2_init(&s->gb, avpkt->data, avpkt->size);
//parse image header //parse image header
if (end_buf - buf < 8) if (avpkt->size < 8)
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
id = AV_RL16(buf); id = bytestream2_get_le16(&s->gb);
buf += 2;
if (id == 0x4949) if (id == 0x4949)
le = 1; le = 1;
else if (id == 0x4D4D) else if (id == 0x4D4D)
@@ -947,25 +946,24 @@ static int decode_frame(AVCodecContext *avctx,
// As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number // As TIFF 6.0 specification puts it "An arbitrary but carefully chosen number
// that further identifies the file as a TIFF file" // that further identifies the file as a TIFF file"
if (tget_short(&buf, le) != 42) { if (tget_short(&s->gb, le) != 42) {
av_log(avctx, AV_LOG_ERROR, av_log(avctx, AV_LOG_ERROR,
"The answer to life, universe and everything is not correct!\n"); "The answer to life, universe and everything is not correct!\n");
return -1; return -1;
} }
// Reset these pointers so we can tell if they were set this frame // Reset these offsets so we can tell if they were set this frame
s->stripsizes = s->stripdata = NULL; s->stripsizesoff = s->strippos = 0;
/* parse image file directory */ /* parse image file directory */
off = tget_long(&buf, le); off = tget_long(&s->gb, le);
if (off >= UINT_MAX - 14 || end_buf - orig_buf < off + 14) { if (off >= UINT_MAX - 14 || avpkt->size < off + 14) {
av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n"); av_log(avctx, AV_LOG_ERROR, "IFD offset is greater than image size\n");
return AVERROR_INVALIDDATA; return AVERROR_INVALIDDATA;
} }
buf = orig_buf + off; bytestream2_seek(&s->gb, off, SEEK_SET);
entries = tget_short(&buf, le); entries = tget_short(&s->gb, le);
for (i = 0; i < entries; i++) { for (i = 0; i < entries; i++) {
if (tiff_decode_tag(s, orig_buf, buf, end_buf) < 0) if (tiff_decode_tag(s) < 0)
return -1; return -1;
buf += 12;
} }
for (i = 0; i<s->geotag_count; i++) { for (i = 0; i<s->geotag_count; i++) {
@@ -985,7 +983,7 @@ static int decode_frame(AVCodecContext *avctx,
} }
} }
if (!s->stripdata && !s->stripoff) { if (!s->strippos && !s->stripoff) {
av_log(avctx, AV_LOG_ERROR, "Image data is missing\n"); av_log(avctx, AV_LOG_ERROR, "Image data is missing\n");
return -1; return -1;
} }
@@ -995,30 +993,38 @@ static int decode_frame(AVCodecContext *avctx,
if (s->strips == 1 && !s->stripsize) { if (s->strips == 1 && !s->stripsize) {
av_log(avctx, AV_LOG_WARNING, "Image data size missing\n"); av_log(avctx, AV_LOG_WARNING, "Image data size missing\n");
s->stripsize = buf_size - s->stripoff; s->stripsize = avpkt->size - s->stripoff;
} }
stride = p->linesize[0]; stride = p->linesize[0];
dst = p->data[0]; dst = p->data[0];
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);
}
for (i = 0; i < s->height; i += s->rps) { for (i = 0; i < s->height; i += s->rps) {
if (s->stripsizes) { if (s->stripsizesoff)
if (s->stripsizes >= end_buf) ssize = tget(&stripsizes, s->sstype, s->le);
return AVERROR_INVALIDDATA; else
ssize = tget(&s->stripsizes, s->sstype, s->le);
} else
ssize = s->stripsize; ssize = s->stripsize;
if (s->stripdata) { if (s->strippos)
if (s->stripdata >= end_buf) soff = tget(&stripdata, s->sot, s->le);
return AVERROR_INVALIDDATA; else
soff = tget(&s->stripdata, s->sot, s->le);
} else
soff = s->stripoff; soff = s->stripoff;
if (soff > buf_size || ssize > buf_size - soff) { if (soff > avpkt->size || ssize > avpkt->size - soff) {
av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n"); av_log(avctx, AV_LOG_ERROR, "Invalid strip size/offset\n");
return -1; return -1;
} }
if (tiff_unpack_strip(s, dst, stride, orig_buf + soff, ssize, if (tiff_unpack_strip(s, dst, stride, avpkt->data + soff, ssize,
FFMIN(s->rps, s->height - i)) < 0) FFMIN(s->rps, s->height - i)) < 0)
break; break;
dst += s->rps * stride; dst += s->rps * stride;
@@ -1061,7 +1067,7 @@ static int decode_frame(AVCodecContext *avctx,
*picture = s->picture; *picture = s->picture;
*data_size = sizeof(AVPicture); *data_size = sizeof(AVPicture);
return buf_size; return avpkt->size;
} }
static av_cold int tiff_init(AVCodecContext *avctx) static av_cold int tiff_init(AVCodecContext *avctx)