From dfd7b0149620e6b3540e4825382dc13dfd6318df Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
Date: Mon, 17 Mar 2025 09:59:36 +0100
Subject: [PATCH 2/3] avcodec/snow: Don't add to NULL
It is undefined behavior.
Fixes "runtime error: applying non-zero offset 8 to null pointer".
Fixes the Snow vsynth FATE-tests.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
libavcodec/snow.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavcodec/snow.h b/libavcodec/snow.h
index ff7ebc1c58..9b19e70bd5 100644
--- a/libavcodec/snow.h
+++ b/libavcodec/snow.h
@@ -272,7 +272,8 @@ static av_always_inline void add_yblock(SnowContext *s, int sliced, slice_buffer
if(!sliced && offset_dst)
dst += src_x + src_y*dst_stride;
- dst8+= src_x + src_y*src_stride;
+ if (sliced || add)
+ dst8+= src_x + src_y*src_stride;
// src += src_x + src_y*src_stride;
ptmp= tmp + 3*tmp_step;
--
2.45.2