wavpack: check packet size early

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
(cherry picked from commit fd06291239c1bb616bf303b5696cc432710b2530)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>

diff --git a/libavcodec/wavpack.c b/libavcodec/wavpack.c
index 7ceb947adb2b514e2c5d3791e19c1aae30bfa442..59d735fab57e5ab3e1eb0bcc3f620a77aad3fddb 100644 (file)
--- a/libavcodec/wavpack.c
+++ b/libavcodec/wavpack.c
@@ -1171,6 +1171,9 @@ static int wavpack_decode_frame(AVCodecContext *avctx, void *data,
     int frame_size, ret, frame_flags;
     int samplecount = 0;
 
+    if (avpkt->size < 12 + s->multichannel * 4)
+        return AVERROR_INVALIDDATA;
+
     s->block     = 0;
     s->ch_offset = 0;