avcodec/rpza: Check that there is enough data for all the blocks

Fixes: Timeout
Fixes: 11547/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RPZA_fuzzer-5678435842654208
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

diff --git a/libavcodec/rpza.c b/libavcodec/rpza.c
index cffbfe441652c0a0fe517ddd39371146a2522cec..8e1efa24450ef6debee826ee2d65a7c7f8540a35 100644 (file)
--- a/libavcodec/rpza.c
+++ b/libavcodec/rpza.c
@@ -105,6 +105,9 @@ static int rpza_decode_stream(RpzaContext *s)
     /* Number of 4x4 blocks in frame. */
     total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
 
+    if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
+        return AVERROR_INVALIDDATA;
+
     if ((ret = ff_reget_buffer(s->avctx, s->frame)) < 0)
         return ret;
     pixels = (uint16_t *)s->frame->data[0];