[FFmpeg-devel] [PATCH v2 1/3] avformat/sapenc: fix leak in sap_write_header()

[Lidong Yan]

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

To prevent from writing free-for-loop in every return point, replace
`return 0` with `ret = 0` so normal execution can fall through fail
code.

Signed-off-by: Lidong Yan <502024330056 at smail.nju.edu.cn>
---
 libavformat/sapenc.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/libavformat/sapenc.c b/libavformat/sapenc.c
index 87a834a8d8..0567a754e2 100644
--- a/libavformat/sapenc.c
+++ b/libavformat/sapenc.c
@@ -233,7 +233,6 @@ static int sap_write_header(AVFormatContext *s)
         ret = AVERROR_INVALIDDATA;
         goto fail;
     }
-    av_freep(&contexts);
     av_log(s, AV_LOG_VERBOSE, "SDP:\n%s\n", &sap->ann[pos]);
     pos += strlen(&sap->ann[pos]);
     sap->ann_size = pos;
@@ -244,11 +243,17 @@ static int sap_write_header(AVFormatContext *s)
         goto fail;
     }
 
-    return 0;
+    ret = 0;
 
 fail:
-    av_free(contexts);
-    sap_write_close(s);
+    if (contexts) {
+        for (i = 0; i < s->nb_streams; i++)
+            if (contexts[i])
+                av_free(contexts[i]->url);
+        av_free(contexts);
+    }
+    if (ret < 0)
+        sap_write_close(s);
     return ret;
 }
 
-- 
2.50.0.107.g33b6ec8c79