ffmpeg | branch: master | Steven Liu <l...@chinaffmpeg.org> | Mon Aug 17 
20:30:18 2020 +0800| [1ee52b2b6c1f6c9618e435b5ed7608442308efe6] | committer: 
liuqi05

avformat/dashdec: check the root url length

if the length of the root url is 0, unnecessary process the root_url

Signed-off-by: Steven Liu <l...@chinaffmpeg.org>
Signed-off-by: liuqi05 <liuq...@kuaishou.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1ee52b2b6c1f6c9618e435b5ed7608442308efe6
---

 libavformat/dashdec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/dashdec.c b/libavformat/dashdec.c
index c28bb07f44..693fc7372b 100644
--- a/libavformat/dashdec.c
+++ b/libavformat/dashdec.c
@@ -771,7 +771,7 @@ static int resolve_content_path(AVFormatContext *s, const 
char *url, int *max_ur
     size = strlen(root_url);
     isRootHttp = ishttp(root_url);
 
-    if (root_url[size - 1] != token) {
+    if (size > 0 && root_url[size - 1] != token) {
         av_strlcat(root_url, "/", size + 2);
         size += 2;
     }

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