Hi!
Attached patch can avoid a crash in avcodec_parameters_from_context()
if extradata_size was increased after allocation.
Please comment, Carl Eugen
From 37ca1caa949902ec209c7c779b2c5b0ca3d3a3e6 Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos <ceffm...@gmail.com>
Date: Sun, 23 Dec 2018 00:34:57 +0100
Subject: [PATCH] lavf/vividas: Do not increase extradata_size after allocation.
Avoids a crash in avcodec_parameters_from_context().
---
libavformat/vividas.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/libavformat/vividas.c b/libavformat/vividas.c
index e199b05..00a1a0f 100644
--- a/libavformat/vividas.c
+++ b/libavformat/vividas.c
@@ -392,7 +392,8 @@ static void track_header(VividasDemuxContext *viv, AVFormatContext *s, uint8_t
offset += data_len[j];
}
- st->codecpar->extradata_size = offset;
+ if (offset < st->codecpar->extradata_size)
+ st->codecpar->extradata_size = offset;
}
}
--
1.7.10.4
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