From 8b55591757244d8244a2be369c2b54c9ae79b02a Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Fri, 8 Jun 2018 18:25:14 +0200
Subject: [PATCH] avcodec/h264_mc_template: Only prefetch motion if the list is
used.
Fixes: index 59 out of bounds for type 'H264Ref [48]'
Fixes: 8232/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_H264_fuzzer-5703295145345024
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/h264_mc_template.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/h264_mc_template.c b/libavcodec/h264_mc_template.c
index 58c05044c1..d02e2bf580 100644
--- a/libavcodec/h264_mc_template.c
+++ b/libavcodec/h264_mc_template.c
@@ -78,7 +78,8 @@ static void MCFUNC(hl_motion)(const H264Context *h, H264SliceContext *sl,
if (HAVE_THREADS && (h->avctx->active_thread_type & FF_THREAD_FRAME))
await_references(h, sl);
- prefetch_motion(h, sl, 0, PIXEL_SHIFT, CHROMA_IDC);
+ if (USES_LIST(mb_type, 0))
+ prefetch_motion(h, sl, 0, PIXEL_SHIFT, CHROMA_IDC);
if (IS_16X16(mb_type)) {
mc_part(h, sl, 0, 1, 16, 0, dest_y, dest_cb, dest_cr, 0, 0,