[FFmpeg-cvslog] avcodec/rasc: Check input size in decode_fint()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Thu Oct 17 23:57:26 2019 +0200| [17603094d57faf95bee00d557fe6de84a05352ef] | committer: Michael Niedermayer

avcodec/rasc: Check input size in decode_fint()

Fixes: Timeout (11sec -> 42ms)
Fixes: 18287/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RASC_fuzzer-5637866331308032

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=17603094d57faf95bee00d557fe6de84a05352ef
---

 libavcodec/rasc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/rasc.c b/libavcodec/rasc.c
index 21fc43f325..cdf20a6db9 100644
--- a/libavcodec/rasc.c
+++ b/libavcodec/rasc.c
@@ -124,6 +124,8 @@ static int decode_fint(AVCodecContext *avctx,
         clear_plane(avctx, s->frame1);
         return 0;
     }
+    if (bytestream2_get_bytes_left(gb) < 72)
+        return AVERROR_INVALIDDATA;
 
     bytestream2_skip(gb, 8);
     w = bytestream2_get_le32(gb);