The documentation of both avio_open() as well as avio_open2() states
that on failure, the pointer to an AVIOContext given to this function
(via a pointer to a pointer to an AVIOContext) will be set to NULL. Yet
it didn't happen upon failure of ffurl_open_whitelist() or when allocating
the internal buffer failed. This commit changes this.

Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@gmail.com>
---
 libavformat/aviobuf.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/aviobuf.c b/libavformat/aviobuf.c
index 0e2f038988..cc22beff28 100644
--- a/libavformat/aviobuf.c
+++ b/libavformat/aviobuf.c
@@ -1145,6 +1145,8 @@ int ffio_open_whitelist(AVIOContext **s, const char 
*filename, int flags,
     URLContext *h;
     int err;
 
+    *s = NULL;
+
     err = ffurl_open_whitelist(&h, filename, flags, int_cb, options, 
whitelist, blacklist, NULL);
     if (err < 0)
         return err;
-- 
2.20.1

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