[FFmpeg-cvslog] avcodec/wmaprodec: Check bits per sample to be within the range not causing integer overflows

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec  5 13:48:06 2015 +0100| [ded0a0415377e2696d006a019f86eab6f1deb8d4] | committer: Michael Niedermayer

avcodec/wmaprodec: Check bits per sample to be within the range not causing integer overflows

Fixes: 549d5aab1480d10f2a775ed90b0342f1/signal_sigabrt_7ffff6ae7cc9_5643_96bbb0cfe3e28be1dadfce1075016345.wma

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 66e05f6ff5e5c105bdd7bf3a49234ddac1b592c5)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ded0a0415377e2696d006a019f86eab6f1deb8d4
---

 libavcodec/wmaprodec.c |    6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavcodec/wmaprodec.c b/libavcodec/wmaprodec.c
index dc581dc..6f5a170 100644
--- a/libavcodec/wmaprodec.c
+++ b/libavcodec/wmaprodec.c
@@ -300,6 +300,12 @@ static av_cold int decode_init(AVCodecContext *avctx)
         s->decode_flags    = AV_RL16(edata_ptr+14);
         channel_mask       = AV_RL32(edata_ptr+2);
         s->bits_per_sample = AV_RL16(edata_ptr);
+
+        if (s->bits_per_sample > 32 || s->bits_per_sample < 1) {
+            avpriv_request_sample(avctx, "bits per sample is %d", s->bits_per_sample);
+            return AVERROR_PATCHWELCOME;
+        }
+
         /** dump the extradata */
         for (i = 0; i < avctx->extradata_size; i++)
             ff_dlog(avctx, "[%x] ", avctx->extradata[i]);