[FFmpeg-cvslog] lavfi/vf_alphamerge: fix memory leaks

[Ganesh Ajjanagadde]

ffmpeg | branch: master | Ganesh Ajjanagadde <gajjanagadde at gmail.com> | Fri Dec  4 00:37:19 2015 -0500| [31f0d555e07797df1a0a141fa5e022648d480a49] | committer: Ganesh Ajjanagadde

lavfi/vf_alphamerge: fix memory leaks

Recent commits 6aaac24d72a7da631173209841a3944fcb4a3309 and
3835554bf8ed78539a3492c239f979c0ab03a15f made progress towards cleaning
up usage of the formats API, and in particular fixed possible NULL pointer
dereferences.

This commit addresses the issue of possible resource leaks when some intermediate
call fails.

Tested with valgrind --leak-check=full --show-leak-kinds=all, and manual simulation
of malloc/realloc failures.

Fixes: CID 1338326, 1338329.

Signed-off-by: Ganesh Ajjanagadde <gajjanagadde at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=31f0d555e07797df1a0a141fa5e022648d480a49
---

 libavfilter/vf_alphamerge.c |   16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)

diff --git a/libavfilter/vf_alphamerge.c b/libavfilter/vf_alphamerge.c
index 8a1ca22..ecc114c 100644
--- a/libavfilter/vf_alphamerge.c
+++ b/libavfilter/vf_alphamerge.c
@@ -61,13 +61,23 @@ static int query_formats(AVFilterContext *ctx)
     int ret;
 
     if (!(main_formats = ff_make_format_list(main_fmts)) ||
-        !(alpha_formats = ff_make_format_list(alpha_fmts)))
-        return AVERROR(ENOMEM);
+        !(alpha_formats = ff_make_format_list(alpha_fmts))) {
+            ret = AVERROR(ENOMEM);
+            goto fail;
+        }
     if ((ret = ff_formats_ref(main_formats , &ctx->inputs[0]->out_formats)) < 0 ||
         (ret = ff_formats_ref(alpha_formats, &ctx->inputs[1]->out_formats)) < 0 ||
         (ret = ff_formats_ref(main_formats , &ctx->outputs[0]->in_formats)) < 0)
-        return ret;
+            goto fail;
     return 0;
+fail:
+    if (main_formats)
+        av_freep(&main_formats->formats);
+    av_freep(&main_formats);
+    if (alpha_formats)
+        av_freep(&alpha_formats->formats);
+    av_freep(&alpha_formats);
+    return ret;
 }
 
 static int config_input_main(AVFilterLink *inlink)