avformat/adtsenc: return value check for init_get_bits in adts_decode_extradata

As the second argument for init_get_bits (buf) can be crafted, a return value check for this function call is necessary.
'buf' is  part of  'AVPacket pkt'.
replace init_get_bits with init_get_bits8.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 9ffa49496d1aae4cbbb387aac28a9e061a6ab0a6)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 4 insertions, 2 deletions

diff --git a/libavformat/adtsenc.c b/libavformat/adtsenc.c
index d937e2bea9..a1593515e1 100644
--- a/libavformat/adtsenc.c
+++ b/libavformat/adtsenc.c
@@ -50,9 +50,11 @@ static int adts_decode_extradata(AVFormatContext *s, ADTSContext *adts, const ui
     GetBitContext gb;
     PutBitContext pb;
     MPEG4AudioConfig m4ac;
-    int off;
+    int off, ret;
 
-    init_get_bits(&gb, buf, size * 8);
+    ret = init_get_bits8(&gb, buf, size);
+    if (ret < 0)
+        return ret;
     off = avpriv_mpeg4audio_get_config2(&m4ac, buf, size, 1, s);
     if (off < 0)
         return off;