[FFmpeg-cvslog] avcodec/gdv: Check for truncated tags in decompress_5()

[Michael Niedermayer]

ffmpeg | branch: release/4.0 | Michael Niedermayer <michael at niedermayer.cc> | Mon Feb 25 01:26:30 2019 +0100| [87eecb7d854599221c4112a241a49e742f4d1f66] | committer: Michael Niedermayer

avcodec/gdv: Check for truncated tags in decompress_5()

Testcase: 13169/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_GDV_fuzzer-5666354038833152

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 5cf42f65b60d226d1223d2100cb1d90402189275)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=87eecb7d854599221c4112a241a49e742f4d1f66
---

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

diff --git a/libavcodec/gdv.c b/libavcodec/gdv.c
index 79ca157dde..addd513091 100644
--- a/libavcodec/gdv.c
+++ b/libavcodec/gdv.c
@@ -244,6 +244,8 @@ static int decompress_5(AVCodecContext *avctx, unsigned skip)
 
     while (bytestream2_get_bytes_left_p(pb) > 0 && bytestream2_get_bytes_left(gb) > 0) {
         int tag = read_bits2(&bits, gb);
+        if (bytestream2_get_bytes_left(gb) < 1)
+            return AVERROR_INVALIDDATA;
         if (tag == 0) {
             bytestream2_put_byte(pb, bytestream2_get_byte(gb));
         } else if (tag == 1) {