[FFmpeg-cvslog] avcodec/dxv: Check for end of input in dxv_decompress_dxt5()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Sep 30 18:54:07 2017 +0200| [d662143f064636f11d92083cd9aa4f907cf97d59] | committer: Michael Niedermayer

avcodec/dxv: Check for end of input in dxv_decompress_dxt5()

Fixes: Timeout
Fixes: 3291/clusterfuzz-testcase-4630024655208448

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=d662143f064636f11d92083cd9aa4f907cf97d59
---

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

diff --git a/libavcodec/dxv.c b/libavcodec/dxv.c
index 6f3c075d06..529e211258 100644
--- a/libavcodec/dxv.c
+++ b/libavcodec/dxv.c
@@ -197,6 +197,8 @@ static int dxv_decompress_dxt5(AVCodecContext *avctx)
             AV_WL32(ctx->tex_data + 4 * pos, prev);
             pos++;
         } else {
+            if (bytestream2_get_bytes_left(gbc) < 1)
+                return AVERROR_INVALIDDATA;
             if (state == 0) {
                 value = bytestream2_get_le32(gbc);
                 state = 16;