From d4c2a3740fb95f952a87ba320d2bf31f126bdf68 Mon Sep 17 00:00:00 2001 From: Martin Storsjö Date: Mon, 16 Sep 2013 21:27:49 +0300 Subject: xmv: Add more sanity checks for parameters read from the bitstream MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 --- libavformat/xmv.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'libavformat/xmv.c') 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; -- cgit v1.2.3