avcodec/gdv: Check available space before reading palette
authorMichael Niedermayer <michael@niedermayer.cc>
Fri, 11 Aug 2017 17:27:02 +0000 (19:27 +0200)
committerMichael Niedermayer <michael@niedermayer.cc>
Fri, 11 Aug 2017 17:27:52 +0000 (19:27 +0200)
Fixes: Timeout
Fixes: 2926/clusterfuzz-testcase-498711001458278

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

index b324e4f..dc91869 100644 (file)
@@ -427,6 +427,8 @@ static int gdv_decode_frame(AVCodecContext *avctx, void *data,
     case 1:
         memset(gdv->frame + PREAMBLE_SIZE, 0, gdv->frame_size - PREAMBLE_SIZE);
     case 0:
+        if (bytestream2_get_bytes_left(gb) < 256*3)
+            return AVERROR_INVALIDDATA;
         for (i = 0; i < 256; i++) {
             unsigned r = bytestream2_get_byte(gb);
             unsigned g = bytestream2_get_byte(gb);