[FFmpeg-cvslog] avformat/hls: Even stricter URL checks

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Fri Jan 15 15:29:22 2016 +0100| [cfda1bea4c18ec1edbc11ecc465f788b02851488] | committer: Michael Niedermayer

avformat/hls: Even stricter URL checks

This fixes a null pointer dereference at least

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cfda1bea4c18ec1edbc11ecc465f788b02851488
---

 libavformat/hls.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/libavformat/hls.c b/libavformat/hls.c
index e4b5de5..7a8610c 100644
--- a/libavformat/hls.c
+++ b/libavformat/hls.c
@@ -611,12 +611,16 @@ static int open_url(HLSContext *c, URLContext **uc, const char *url, AVDictionar
     AVDictionary *tmp = NULL;
     int ret;
     const char *proto_name = avio_find_protocol_name(url);
+
+    if (!proto_name)
+        return AVERROR_INVALIDDATA;
+
     // only http(s) & file are allowed
     if (!av_strstart(proto_name, "http", NULL) && !av_strstart(proto_name, "file", NULL))
         return AVERROR_INVALIDDATA;
     if (!strncmp(proto_name, url, strlen(proto_name)) && url[strlen(proto_name)] == ':')
         ;
-    else if (strcmp(proto_name, "file") || !strcmp(url, "file,"))
+    else if (strcmp(proto_name, "file") || !strncmp(url, "file,", 5))
         return AVERROR_INVALIDDATA;
 
     av_dict_copy(&tmp, c->avio_opts, 0);