[FFmpeg-cvslog] avcodec/eatgv: Check remaining size after the keyframe header

Michael Niedermayer git at videolan.org
Mon Jul 29 23:59:31 EEST 2019


ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Jul 28 21:09:14 2019 +0200| [009ec8dc3345353b1cd2316423918533fcb89552] | committer: Michael Niedermayer

avcodec/eatgv: Check remaining size after the keyframe header

The minimal size which unpack() will not fail on is 5 bytes
Fixes: Timeout (14sec -> 77ms) (testcase 15508)
Fixes: 15508/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EATGV_fuzzer-5700053513011200
Fixes: 15996/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_EATGV_fuzzer-5751353223151616

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=009ec8dc3345353b1cd2316423918533fcb89552
---

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

diff --git a/libavcodec/eatgv.c b/libavcodec/eatgv.c
index 93e291f053..f82f7b9cca 100644
--- a/libavcodec/eatgv.c
+++ b/libavcodec/eatgv.c
@@ -300,6 +300,9 @@ static int tgv_decode_frame(AVCodecContext *avctx,
             s->palette[i] = 0xFFU << 24 | AV_RB24(buf);
             buf += 3;
         }
+        if (buf_end - buf < 5) {
+            return AVERROR_INVALIDDATA;
+        }
     }
 
     if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)



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