attrs: Check printf formatting in buffer_append_printf()

https://bugzilla.redhat.com/show_bug.cgi?id=985497

1 files changed, 5 insertions, 0 deletions

diff --git a/common/attrs.c b/common/attrs.c
index 8054e38..b06a342 100644
--- a/common/attrs.c
+++ b/common/attrs.c
@@ -516,6 +516,11 @@ p11_attr_hash (const void *data)
 static void
 buffer_append_printf (p11_buffer *buffer,
                       const char *format,
+                      ...) GNUC_PRINTF(2, 3);
+
+static void
+buffer_append_printf (p11_buffer *buffer,
+                      const char *format,
                       ...)
 {
 	char *string;