From 00555f4b8b40e52b379b24464a96f94d90432fee Mon Sep 17 00:00:00 2001
From: Jun Zhao <barryjzhao@tencent.com>
Date: Fri, 10 May 2019 19:03:54 +0800
Subject: [PATCH] lavc/avpacket: check NULL before using the pointer

Need to check NULL before using the pointer

Signed-off-by: Jun Zhao <barryjzhao@tencent.com>
---
 libavcodec/avpacket.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index 8f0603df78..2b20067211 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -522,11 +522,12 @@ fail:
 
 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
 {
-    const uint8_t *end = data + size;
+    const uint8_t *end;
     int ret = 0;
 
     if (!dict || !data || !size)
         return ret;
+    end = data + size;
     if (size && end[-1])
         return AVERROR_INVALIDDATA;
     while (data < end) {