diff options
| author | Martin Storsjö <martin@martin.st> | 2013-09-16 21:27:49 +0300 |
|---|---|---|
| committer | Martin Storsjö <martin@martin.st> | 2013-09-17 20:09:25 +0300 |
| commit | d4c2a3740fb95f952a87ba320d2bf31f126bdf68 (patch) | |
| tree | 53ff41ce5ffe9bd6f55ef3e3bb65fe1ce2c08537 | |
| parent | dc4acc820076b2149ef6c921bdabe05d07ca1bc6 (diff) | |
| download | ffmpeg-d4c2a3740fb95f952a87ba320d2bf31f126bdf68.tar.gz | |
xmv: Add more sanity checks for parameters read from the bitstream
Since the number of channels is multiplied by 36 and assigned to
to a uint16_t, make sure this calculation didn't overflow. (In
certain cases the calculation could overflow leaving the
truncated block_align at 0, leading to divisions by zero later.)
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
| -rw-r--r-- | libavformat/xmv.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/libavformat/xmv.c b/libavformat/xmv.c index bc7c3c9410..2b2fd4551c 100644 --- a/libavformat/xmv.c +++ b/libavformat/xmv.c @@ -43,6 +43,8 @@ XMV_AUDIO_ADPCM51_FRONTCENTERLOW | \ XMV_AUDIO_ADPCM51_REARLEFTRIGHT) +#define XMV_BLOCK_ALIGN_SIZE 36 + typedef struct XMVAudioTrack { uint16_t compression; uint16_t channels; @@ -207,7 +209,7 @@ static int xmv_read_header(AVFormatContext *s) track->bit_rate = track->bits_per_sample * track->sample_rate * track->channels; - track->block_align = 36 * track->channels; + track->block_align = XMV_BLOCK_ALIGN_SIZE * track->channels; track->block_samples = 64; track->codec_id = ff_wav_codec_get_id(track->compression, track->bits_per_sample); @@ -224,7 +226,8 @@ static int xmv_read_header(AVFormatContext *s) av_log(s, AV_LOG_WARNING, "Unsupported 5.1 ADPCM audio stream " "(0x%04X)\n", track->flags); - if (!track->channels || !track->sample_rate) { + if (!track->channels || !track->sample_rate || + track->channels >= UINT16_MAX / XMV_BLOCK_ALIGN_SIZE) { av_log(s, AV_LOG_ERROR, "Invalid parameters for audio track %d.\n", audio_track); ret = AVERROR_INVALIDDATA; |