[FFmpeg-devel] [PATCH] avcodec/fic: Check available input space for cursor

[Michael Niedermayer]

Fixes: out of array read
Fixes: 6546/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FIC_fuzzer-6317064647081984

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/fic.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavcodec/fic.c b/libavcodec/fic.c
index d7ee370423..6824a5683c 100644
--- a/libavcodec/fic.c
+++ b/libavcodec/fic.c
@@ -337,6 +337,11 @@ static int fic_decode_frame(AVCodecContext *avctx, void *data,
         skip_cursor = 1;
     }
 
+    if (!skip_cursor && avpkt->size < 59 + 32 * 32 * 4) {
+        av_log(avctx, AV_LOG_WARNING, "Input is cursorless\n");
+        skip_cursor = 1;
+    }
+
     /* Slice height for all but the last slice. */
     ctx->slice_h = 16 * (ctx->aligned_height >> 4) / nslices;
     if (ctx->slice_h % 16)
-- 
2.17.0