shorten: dont leave invalid channel counts in the context.

Fixes freeing invalid addresses

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <[email protected]>
(cherry picked from commit 4f1279154ee9baf2078241bf5619774970d18b25)

Conflicts:

	libavcodec/shorten.c

1 files changed, 1 insertions, 0 deletions

diff --git a/libavcodec/shorten.c b/libavcodec/shorten.c
index d04011e468..470b467b8c 100644
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@@ -342,6 +342,7 @@ static int read_header(ShortenContext *s)
     s->channels = get_uint(s, CHANSIZE);
     if (s->channels > MAX_CHANNELS) {
         av_log(s->avctx, AV_LOG_ERROR, "too many channels: %d\n", s->channels);
+        s->channels = 0;
         return -1;
     }
     s->avctx->channels = s->channels;