[FFmpeg-cvslog] avfilter/graphdump: Don't return truncated string

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Thu Aug 26 13:31:06 2021 +0200| [76ff9640bea867a8ae5b7972faddc85eb7476222] | committer: Andreas Rheinhardt

avfilter/graphdump: Don't return truncated string

Reviewed-by: Nicolas George <george at nsup.org>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=76ff9640bea867a8ae5b7972faddc85eb7476222
---

 libavfilter/graphdump.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavfilter/graphdump.c b/libavfilter/graphdump.c
index cf3296550c..099125bea8 100644
--- a/libavfilter/graphdump.c
+++ b/libavfilter/graphdump.c
@@ -159,8 +159,10 @@ char *avfilter_graph_dump(AVFilterGraph *graph, const char *options)
 
     av_bprint_init(&buf, 0, AV_BPRINT_SIZE_COUNT_ONLY);
     avfilter_graph_dump_to_buf(&buf, graph);
-    av_bprint_init(&buf, buf.len + 1, buf.len + 1);
+    dump = av_malloc(buf.len + 1);
+    if (!dump)
+        return NULL;
+    av_bprint_init_for_buffer(&buf, dump, buf.len + 1);
     avfilter_graph_dump_to_buf(&buf, graph);
-    av_bprint_finalize(&buf, &dump);
     return dump;
 }