[FFmpeg-devel] [PATCH] avcodec/notchlc: Check available space for luma block code

[Michael Niedermayer]

Fixes: Timeout (too long -> 2sec)
Fixes: 25439/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_NOTCHLC_fuzzer-5688211127664640

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
 libavcodec/notchlc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/notchlc.c b/libavcodec/notchlc.c
index 3f7079da70..e7e69b0c21 100644
--- a/libavcodec/notchlc.c
+++ b/libavcodec/notchlc.c
@@ -229,6 +229,9 @@ static int decode_blocks(AVCodecContext *avctx, AVFrame *p, ThreadFrame *frame,
     bytestream2_seek(&rgb, s->y_data_row_offsets, SEEK_SET);
     bytestream2_seek(gb, s->y_control_data_offset, SEEK_SET);
 
+    if ((avctx->height + 3) / 4 * ((avctx->width + 3) / 4) * 4 > bytestream2_get_bytes_left(gb))
+        return AVERROR_INVALIDDATA;
+
     dsty = (uint16_t *)p->data[0];
     dsta = (uint16_t *)p->data[3];
     ylinesize = p->linesize[0] / 2;
-- 
2.17.1