[FFmpeg-devel] [PATCH v4 2/3] avformat/sapenc: fix leak in sap_write_header()

[Lidong Yan <yldhome2d2-at-gmail.com@ffmpeg.org>]

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 cleanup
code.

Signed-off-by: Lidong Yan <502024330056@smail.nju.edu.cn>
---
 libavformat/sapenc.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/libavformat/sapenc.c b/libavformat/sapenc.c
index 87a834a8d8..0882690ba5 100644
--- a/libavformat/sapenc.c
+++ b/libavformat/sapenc.c
@@ -244,11 +244,15 @@ static int sap_write_header(AVFormatContext *s)
         goto fail;
     }
 
-    return 0;
+    ret = 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);
+    if (ret < 0)
+        sap_write_close(s);
     return ret;
 }
 
-- 
2.50.0.106.gf0135a9047.dirty

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