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ac3dec: ensure get_buffer() gets a buffer for the correct number of channels

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If there is an error during frame parsing, but AVCodecContext.channels was
changed and AC3DecodeContext.out_channels was set previously, the two may not
match.

Fixes CVE-2012-2802
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind

CC: libav-stable@libav.org
(cherry picked from commit 56b6a43056235fc110a018678da590595734203d)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Justin Ruggles 2012-09-29 11:31:35 -04:00 committed by Reinhard Tartler
parent 31bc3fb563
commit d7de11260b
1 changed files with 1 additions and 0 deletions
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libavcodec/ac3dec.c
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@ -1404,6 +1404,7 @@ static int ac3_decode_frame(AVCodecContext * avctx, void *data,
avctx->audio_service_type = AV_AUDIO_SERVICE_TYPE_KARAOKE;
/* get output buffer */
avctx->channels = s->out_channels;
s->frame.nb_samples = s->num_blocks * 256;
if ((ret = avctx->get_buffer(avctx, &s->frame)) < 0) {
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");