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FFmpeg/libavformat/aaxdec.c
Andreas Rheinhardt 5b33f523d7 avformat/aaxdec: Fix potential integer overflow 
The AAX demuxer reads a 32bit number containing the amount of entries
of an array and stores it in an uint32_t. Yet when iterating over this
array, a loop counter of type int is used. This leads to undefined
behaviour if the amount of entries is not in the range of int; to avoid
this, it is generally good to use the same type for the loop counter as
for the variable it is compared to. This is done in one of the two loops
affected by this.

In the other loop, the undefined behaviour can begin even earlier: Here
the loop counter is multiplied by an uint16_t which can overflow as soon
as the loop counter is > 2^15. Using an unsigned type would avoid the
undefined behaviour, but truncation would still be possible, so use an
uint64_t.

Also use an uint32_t for a variable containing an index in said array.

This fixes Coverity issue #1466767.

Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
2020-09-20 20:06:55 +02:00

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/*
* AAX demuxer
* Copyright (c) 2020 Paul B Mahol
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/avassert.h"
#include "libavutil/intreadwrite.h"
#include "avformat.h"
#include "internal.h"
typedef struct AAXColumn {
uint8_t flag;
uint8_t type;
const char *name;
uint32_t offset;
int size;
} AAXColumn;
typedef struct AAXSegment {
int64_t start;
int64_t end;
} AAXSegment;
typedef struct AAXContext {
int64_t table_size;
uint16_t version;
int64_t rows_offset;
int64_t strings_offset;
int64_t data_offset;
int64_t name_offset;
uint16_t columns;
uint16_t row_width;
uint32_t nb_segments;
int64_t schema_offset;
int64_t strings_size;
char *string_table;
uint32_t current_segment;
AAXColumn *xcolumns;
AAXSegment *segments;
} AAXContext;
static int aax_probe(const AVProbeData *p)
{
if (AV_RB32(p->buf) != MKBETAG('@','U','T','F'))
return 0;
if (AV_RB32(p->buf + 4) == 0)
return 0;
if (AV_RB16(p->buf + 8) > 1)
return 0;
if (AV_RB32(p->buf + 28) < 1)
return 0;
return AVPROBE_SCORE_MAX;
}
enum ColumnFlag {
COLUMN_FLAG_NAME = 0x1,
COLUMN_FLAG_DEFAULT = 0x2,
COLUMN_FLAG_ROW = 0x4,
COLUMN_FLAG_UNDEFINED = 0x8 /* shouldn't exist */
};
enum ColumnType {
COLUMN_TYPE_UINT8 = 0x00,
COLUMN_TYPE_SINT8 = 0x01,
COLUMN_TYPE_UINT16 = 0x02,
COLUMN_TYPE_SINT16 = 0x03,
COLUMN_TYPE_UINT32 = 0x04,
COLUMN_TYPE_SINT32 = 0x05,
COLUMN_TYPE_UINT64 = 0x06,
COLUMN_TYPE_SINT64 = 0x07,
COLUMN_TYPE_FLOAT = 0x08,
COLUMN_TYPE_DOUBLE = 0x09,
COLUMN_TYPE_STRING = 0x0a,
COLUMN_TYPE_VLDATA = 0x0b,
COLUMN_TYPE_UINT128 = 0x0c, /* for GUIDs */
COLUMN_TYPE_UNDEFINED = -1
};
static int64_t get_pts(AVFormatContext *s, int64_t pos, int size)
{
AAXContext *a = s->priv_data;
int64_t pts = 0;
for (int seg = 0; seg < a->current_segment; seg++)
pts += (a->segments[seg].end - a->segments[seg].start) / size;
pts += ((pos - a->segments[a->current_segment].start) / size);
return pts;
}
static int aax_read_header(AVFormatContext *s)
{
AAXContext *a = s->priv_data;
AVIOContext *pb = s->pb;
AVCodecParameters *par;
AVStream *st;
int64_t column_offset = 0;
int ret, extradata_size;
char *codec;
avio_skip(pb, 4);
a->table_size = avio_rb32(pb) + 8LL;
a->version = avio_rb16(pb);
a->rows_offset = avio_rb16(pb) + 8LL;
a->strings_offset = avio_rb32(pb) + 8LL;
a->data_offset = avio_rb32(pb) + 8LL;
a->name_offset = avio_rb32(pb);
a->columns = avio_rb16(pb);
a->row_width = avio_rb16(pb);
a->nb_segments = avio_rb32(pb);
if (a->nb_segments < 1)
return AVERROR_INVALIDDATA;
a->schema_offset = 0x20;
a->strings_size = a->data_offset - a->strings_offset;
if (a->rows_offset > a->table_size ||
a->strings_offset > a->table_size ||
a->data_offset > a->table_size)
return AVERROR_INVALIDDATA;
if (a->strings_size <= 0 || a->name_offset >= a->strings_size ||
a->strings_size > UINT16_MAX)
return AVERROR_INVALIDDATA;
if (a->columns <= 0)
return AVERROR_INVALIDDATA;
a->segments = av_calloc(a->nb_segments, sizeof(*a->segments));
if (!a->segments)
return AVERROR(ENOMEM);
a->xcolumns = av_calloc(a->columns, sizeof(*a->xcolumns));
if (!a->xcolumns) {
ret = AVERROR(ENOMEM);
goto fail;
}
a->string_table = av_calloc(a->strings_size + 1, sizeof(*a->string_table));
if (!a->string_table) {
ret = AVERROR(ENOMEM);
goto fail;
}
for (int c = 0; c < a->columns; c++) {
uint8_t info = avio_r8(pb);
uint32_t offset = avio_rb32(pb);
int value_size;
if (offset >= a->strings_size) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
a->xcolumns[c].flag = info >> 4;
a->xcolumns[c].type = info & 0x0F;
switch (a->xcolumns[c].type) {
case COLUMN_TYPE_UINT8:
case COLUMN_TYPE_SINT8:
value_size = 0x01;
break;
case COLUMN_TYPE_UINT16:
case COLUMN_TYPE_SINT16:
value_size = 0x02;
break;
case COLUMN_TYPE_UINT32:
case COLUMN_TYPE_SINT32:
case COLUMN_TYPE_FLOAT:
case COLUMN_TYPE_STRING:
value_size = 0x04;
break;
case COLUMN_TYPE_VLDATA:
value_size = 0x08;
break;
case COLUMN_TYPE_UINT128:
value_size = 0x10;
break;
default:
ret = AVERROR_INVALIDDATA;
goto fail;
}
a->xcolumns[c].size = value_size;
if (a->xcolumns[c].flag & COLUMN_FLAG_NAME)
a->xcolumns[c].name = a->string_table + offset;
if (a->xcolumns[c].flag & COLUMN_FLAG_DEFAULT) {
/* data is found relative to columns start */
a->xcolumns[c].offset = avio_tell(pb) - a->schema_offset;
avio_skip(pb, value_size);
}
if (a->xcolumns[c].flag & COLUMN_FLAG_ROW) {
/* data is found relative to row start */
a->xcolumns[c].offset = column_offset;
column_offset += value_size;
}
}
avio_seek(pb, a->strings_offset, SEEK_SET);
ret = avio_read(pb, a->string_table, a->strings_size);
if (ret != a->strings_size) {
if (ret < 0)
goto fail;
ret = AVERROR(EIO);
goto fail;
}
for (int c = 0; c < a->columns; c++) {
int64_t data_offset = 0;
int64_t col_offset;
int flag, type;
if (strcmp(a->xcolumns[c].name, "data"))
continue;
type = a->xcolumns[c].type;
flag = a->xcolumns[c].flag;
col_offset = a->xcolumns[c].offset;
for (uint64_t r = 0; r < a->nb_segments; r++) {
if (flag & COLUMN_FLAG_DEFAULT) {
data_offset = a->schema_offset + col_offset;
} else if (flag & COLUMN_FLAG_ROW) {
data_offset = a->rows_offset + r * a->row_width + col_offset;
} else {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_seek(pb, data_offset, SEEK_SET);
if (type == COLUMN_TYPE_VLDATA) {
int64_t start, size;
start = avio_rb32(pb);
size = avio_rb32(pb);
a->segments[r].start = start + a->data_offset;
a->segments[r].end = a->segments[r].start + size;
} else {
ret = AVERROR_INVALIDDATA;
goto fail;
}
}
}
st = avformat_new_stream(s, NULL);
if (!st) {
ret = AVERROR(ENOMEM);
goto fail;
}
st->start_time = 0;
par = s->streams[0]->codecpar;
par->codec_type = AVMEDIA_TYPE_AUDIO;
codec = a->string_table + a->name_offset;
if (!strcmp(codec, "AAX")) {
par->codec_id = AV_CODEC_ID_ADPCM_ADX;
avio_seek(pb, a->segments[0].start, SEEK_SET);
if (avio_rb16(pb) != 0x8000) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
extradata_size = avio_rb16(pb) + 4;
if (extradata_size < 12) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avio_seek(pb, -4, SEEK_CUR);
ret = ff_get_extradata(s, par, pb, extradata_size);
if (ret < 0) {
goto fail;
}
par->channels = AV_RB8 (par->extradata + 7);
par->sample_rate = AV_RB32(par->extradata + 8);
if (!par->channels || !par->sample_rate) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
avpriv_set_pts_info(st, 64, 32, par->sample_rate);
/*} else if (!strcmp(codec, "HCA") ){
par->codec_id = AV_CODEC_ID_HCA;*/
} else {
ret = AVERROR_INVALIDDATA;
goto fail;
}
return 0;
fail:
av_freep(&a->string_table);
av_freep(&a->xcolumns);
av_freep(&a->segments);
return ret;
}
static int aax_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AAXContext *a = s->priv_data;
AVCodecParameters *par = s->streams[0]->codecpar;
AVIOContext *pb = s->pb;
const int size = 18 * par->channels;
int ret, extradata_size = 0;
uint8_t *extradata = NULL;
int skip = 0;
if (avio_feof(pb))
return AVERROR_EOF;
pkt->pos = avio_tell(pb);
for (uint32_t seg = 0; seg < a->nb_segments; seg++) {
int64_t start = a->segments[seg].start;
int64_t end = a->segments[seg].end;
if (pkt->pos >= start && pkt->pos <= end) {
a->current_segment = seg;
if (par->codec_id == AV_CODEC_ID_ADPCM_ADX)
skip = (end - start) - ((end - start) / size) * size;
break;
}
}
if (pkt->pos >= a->segments[a->current_segment].end - skip) {
if (a->current_segment + 1 == a->nb_segments)
return AVERROR_EOF;
a->current_segment++;
avio_seek(pb, a->segments[a->current_segment].start, SEEK_SET);
if (par->codec_id == AV_CODEC_ID_ADPCM_ADX) {
if (avio_rb16(pb) != 0x8000)
return AVERROR_INVALIDDATA;
extradata_size = avio_rb16(pb) + 4;
avio_seek(pb, -4, SEEK_CUR);
if (extradata_size < 12)
return AVERROR_INVALIDDATA;
extradata = av_malloc(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
if (!extradata)
return AVERROR(ENOMEM);
if (avio_read(pb, extradata, extradata_size) != extradata_size) {
av_free(extradata);
return AVERROR(EIO);
}
memset(extradata + extradata_size, 0, AV_INPUT_BUFFER_PADDING_SIZE);
}
}
ret = av_get_packet(pb, pkt, size);
if (ret != size) {
av_free(extradata);
return ret < 0 ? ret : AVERROR(EIO);
}
pkt->duration = 1;
pkt->stream_index = 0;
pkt->pts = get_pts(s, pkt->pos, size);
if (extradata) {
ret = av_packet_add_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, extradata, extradata_size);
if (ret < 0) {
av_free(extradata);
return ret;
}
}
return ret;
}
static int aax_read_close(AVFormatContext *s)
{
AAXContext *a = s->priv_data;
av_freep(&a->segments);
av_freep(&a->xcolumns);
av_freep(&a->string_table);
return 0;
}
AVInputFormat ff_aax_demuxer = {
.name = "aax",
.long_name = NULL_IF_CONFIG_SMALL("CRI AAX"),
.priv_data_size = sizeof(AAXContext),
.read_probe = aax_probe,
.read_header = aax_read_header,
.read_packet = aax_read_packet,
.read_close = aax_read_close,
.extensions = "aax",
.flags = AVFMT_GENERIC_INDEX,
};
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