MrBesen/ffmpeg
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mvdec: check channel count.

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Fixes division by 0

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2013-01-22 23:05:53 +01:00
parent e6cc3c869b
commit b89815f519
1 changed files with 18 additions and 4 deletions
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22
libavformat/mvdec.c
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@ -88,6 +88,16 @@ static void var_read_metadata(AVFormatContext *avctx, const char *tag, int size)
av_dict_set(&avctx->metadata, tag, value, AV_DICT_DONT_STRDUP_VAL);
}
static int set_channels(AVFormatContext *avctx, AVStream *st, int channels) {
if (channels <= 0) {
av_log(avctx, AV_LOG_ERROR, "Channel count %d invalid\n", channels);
return AVERROR_INVALIDDATA;
}
st->codec->channels = channels;
st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
return 0;
}
/**
* Parse global variable
* @return < 0 if unknown
@ -126,8 +136,7 @@ static int parse_audio_var(AVFormatContext *avctx, AVStream *st, const char *nam
} else if (!strcmp(name, "DEFAULT_VOL")) {
var_read_metadata(avctx, name, size);
} else if (!strcmp(name, "NUM_CHANNELS")) {
st->codec->channels = var_read_int(pb, size);
st->codec->channel_layout = (st->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
return set_channels(avctx, st, var_read_int(pb, size));
} else if (!strcmp(name, "SAMPLE_RATE")) {
st->codec->sample_rate = var_read_int(pb, size);
avpriv_set_pts_info(st, 33, 1, st->codec->sample_rate);
@ -275,8 +284,9 @@ static int mv_read_header(AVFormatContext *avctx)
ast->nb_frames = vst->nb_frames;
ast->codec->sample_rate = avio_rb32(pb);
avpriv_set_pts_info(ast, 33, 1, ast->codec->sample_rate);
ast->codec->channels = avio_rb32(pb);
ast->codec->channel_layout = (ast->codec->channels == 1) ? AV_CH_LAYOUT_MONO : AV_CH_LAYOUT_STEREO;
if (set_channels(avctx, ast, avio_rb32(pb)) < 0)
return AVERROR_INVALIDDATA;
v = avio_rb32(pb);
if (v == AUDIO_FORMAT_SIGNED) {
ast->codec->codec_id = AV_CODEC_ID_PCM_S16BE;
@ -322,6 +332,10 @@ static int mv_read_header(AVFormatContext *avctx)
ast->codec->codec_id = AV_CODEC_ID_NONE;
}
ast->codec->codec_tag = 0;
if (ast->codec->channels <= 0) {
av_log(avctx, AV_LOG_ERROR, "No valid channel count found\n");
return AVERROR_INVALIDDATA;
}
}
if (mv->nb_video_tracks > 1) {