[FFmpeg-cvslog] avcodec/jvdec: Check available input space before decode8x8()

[Michael Niedermayer]

ffmpeg | branch: release/3.2 | Michael Niedermayer <michael at niedermayer.cc> | Thu Feb 21 01:09:43 2019 +0100| [fdf19ce6c6e967ee6a720f7683c552318519402f] | committer: Michael Niedermayer

avcodec/jvdec: Check available input space before decode8x8()

Fixes: Timeout (78 sec -> 15 millisec)
Fixes: 13147/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_JV_fuzzer-5727107827630080

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 61523683c5a9bda9aaa7ae24764a3df0401a9877)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fdf19ce6c6e967ee6a720f7683c552318519402f
---

 libavcodec/jvdec.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/jvdec.c b/libavcodec/jvdec.c
index cbe83d3c10..4337d5681e 100644
--- a/libavcodec/jvdec.c
+++ b/libavcodec/jvdec.c
@@ -170,6 +170,11 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
             GetBitContext gb;
             init_get_bits(&gb, buf, 8 * video_size);
 
+            if (avctx->height/8 * (avctx->width/8) > 4 * video_size) {
+                av_log(avctx, AV_LOG_ERROR, "Insufficient input data for dimensions\n");
+                return AVERROR_INVALIDDATA;
+            }
+
             for (j = 0; j < avctx->height; j += 8)
                 for (i = 0; i < avctx->width; i += 8)
                     decode8x8(&gb,