[FFmpeg-cvslog] avcodec/rasc: Check input space before reading chunk

[Michael Niedermayer]

ffmpeg | branch: release/4.1 | Michael Niedermayer <michael at niedermayer.cc> | Wed Dec  5 02:18:51 2018 +0100| [9b5a6bb67ba35b3442667964f9e3a7e330b10bdc] | committer: Michael Niedermayer

avcodec/rasc: Check input space before reading chunk

Fixes: Timeout
Fixes: 11118/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-5652564066959360

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 52ba824c65817c1db6aad41c470dde7162252036)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=9b5a6bb67ba35b3442667964f9e3a7e330b10bdc
---

 libavcodec/rasc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/rasc.c b/libavcodec/rasc.c
index e8e0740ddd..67351dfd19 100644
--- a/libavcodec/rasc.c
+++ b/libavcodec/rasc.c
@@ -680,6 +680,9 @@ static int decode_frame(AVCodecContext *avctx,
     while (bytestream2_get_bytes_left(gb) > 0) {
         unsigned type, size = 0;
 
+        if (bytestream2_get_bytes_left(gb) < 8)
+            return AVERROR_INVALIDDATA;
+
         type = bytestream2_get_le32(gb);
         if (type == KBND || type == BNDL) {
             intra = type == KBND;