sink_buffer: copy list of provided formats in the context

A list of formats may have been dynamically created by the calling code,
and thus should not be referenced by the sink buffer context.

Avoid possible invalid data reference.

1 files changed, 12 insertions, 0 deletions

diff --git a/libavfilter/internal.h b/libavfilter/internal.h
index 9f28a839df..227fe6243d 100644
--- a/libavfilter/internal.h
+++ b/libavfilter/internal.h
@@ -69,6 +69,18 @@ void ff_avfilter_default_free_buffer(AVFilterBuffer *buf);
 /** Tell is a format is contained in the provided list terminated by -1. */
 int ff_fmt_is_in(int fmt, const int *fmts);
 
+/**
+ * Return a copy of a list of integers terminated by -1, or NULL in
+ * case of copy failure.
+ */
+int *ff_copy_int_list(const int * const list);
+
+/**
+ * Return a copy of a list of 64-bit integers, or NULL in case of
+ * copy failure.
+ */
+int64_t *ff_copy_int64_list(const int64_t * const list);
+
 /* Functions to parse audio format arguments */
 
 /**