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4xm: do not overread while parsing header

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Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Luca Barbato 2013-06-05 18:56:28 +02:00
parent e7a44f87d0
commit 42d73f7f6b
1 changed files with 14 additions and 6 deletions
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20
libavformat/4xm.c
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@ -90,11 +90,12 @@ static int fourxm_probe(AVProbeData *p)
}
static int parse_vtrk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size)
FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left)
{
AVStream *st;
/* check that there is enough data */
if (size != vtrk_SIZE) {
if (size != vtrk_SIZE || left < size + 8) {
return AVERROR_INVALIDDATA;
}
@ -120,12 +121,13 @@ static int parse_vtrk(AVFormatContext *s,
static int parse_strk(AVFormatContext *s,
FourxmDemuxContext *fourxm, uint8_t *buf, int size)
FourxmDemuxContext *fourxm, uint8_t *buf, int size,
int left)
{
AVStream *st;
int track;
/* check that there is enough data */
if (size != strk_SIZE)
if (size != strk_SIZE || left < size + 8)
return AVERROR_INVALIDDATA;
track = AV_RL32(buf + 8);
@ -217,14 +219,20 @@ static int fourxm_read_header(AVFormatContext *s)
size = AV_RL32(&header[i + 4]);
if (fourcc_tag == std__TAG) {
if (header_size - i < 16) {
ret = AVERROR_INVALIDDATA;
goto fail;
}
fourxm->fps = av_int2float(AV_RL32(&header[i + 12]));
} else if (fourcc_tag == vtrk_TAG) {
if ((ret = parse_vtrk(s, fourxm, header + i, size)) < 0)
if ((ret = parse_vtrk(s, fourxm, header + i, size,
header_size - i)) < 0)
goto fail;
i += 8 + size;
} else if (fourcc_tag == strk_TAG) {
if ((ret = parse_strk(s, fourxm, header + i, size)) < 0)
if ((ret = parse_strk(s, fourxm, header + i, size,
header_size - i)) < 0)
goto fail;
i += 8 + size;