[FFmpeg-cvslog] av_dict_set: fix potential memory leak with AV_DICT_DONT_OVERWRITE

[Janne Grunau]

ffmpeg | branch: master | Janne Grunau <janne-libav at jannau.net> | Sun Jun  8 17:53:31 2014 +0200| [1619274fb393f55a365cc10f88faa173c9a8e772] | committer: Janne Grunau

av_dict_set: fix potential memory leak with AV_DICT_DONT_OVERWRITE

av_dict_set leaks it key/value arguments if AV_DICT_DONT_OVERWRITE is
combined with AV_DICT_DONT_STRDUP_{KEY,VAL} and the key exists.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=1619274fb393f55a365cc10f88faa173c9a8e772
---

 libavutil/dict.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libavutil/dict.c b/libavutil/dict.c
index 7b4dbf2..e4ea776 100644
--- a/libavutil/dict.c
+++ b/libavutil/dict.c
@@ -76,8 +76,11 @@ int av_dict_set(AVDictionary **pm, const char *key, const char *value,
         m = *pm = av_mallocz(sizeof(*m));
 
     if (tag) {
-        if (flags & AV_DICT_DONT_OVERWRITE)
+        if (flags & AV_DICT_DONT_OVERWRITE) {
+            if (flags & AV_DICT_DONT_STRDUP_KEY) av_free(key);
+            if (flags & AV_DICT_DONT_STRDUP_VAL) av_free(value);
             return 0;
+        }
         if (flags & AV_DICT_APPEND)
             oldval = tag->value;
         else