In sap_write_header(), ff_format_set_url() assign new allocated new_url
to contexts[i]->url but forgot to free it later. Add two loops to free
contexts[i]->url before av_free(context).

Signed-off-by: Lidong Yan <502024330...@smail.nju.edu.cn>
---
 libavformat/sapenc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/libavformat/sapenc.c b/libavformat/sapenc.c
index 87a834a8d8..3ba7f16022 100644
--- a/libavformat/sapenc.c
+++ b/libavformat/sapenc.c
@@ -233,6 +233,9 @@ static int sap_write_header(AVFormatContext *s)
         ret = AVERROR_INVALIDDATA;
         goto fail;
     }
+    for (i = 0; i < s->nb_streams; i++)
+        if (contexts[i])
+            av_free(contexts[i]->url);
     av_freep(&contexts);
     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
     pos += strlen(&sap->ann[pos]);
@@ -247,6 +250,9 @@ static int sap_write_header(AVFormatContext *s)
     return 0;
 
 fail:
+    for (i = 0; i < s->nb_streams; i++)
+        if (contexts[i])
+            av_free(contexts[i]->url);
     av_free(contexts);
     sap_write_close(s);
     return ret;
-- 
2.50.0-rc1

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