From 6d463ca97cf329fe5b7bb29ff5581076ff7245f9 Mon Sep 17 00:00:00 2001
From: Nick Hainke <vincent@systemli.org>
Date: Wed, 13 Oct 2021 07:57:09 +0200
Subject: [PATCH] babeld: free blob-buffers that are on stack

As Felix mentioned:
If a buffer was already allocated, blob_buf_init reuses it. You can
keep reusing it as many times as you want. You only need to call
blob_buf_free if you explicitly want to free the buffer memory
(e.g. on exit, or if the blob_buf is on stack).

http://lists.openwrt.org/pipermail/openwrt-devel/2021-October/036722.html

This PR frees the blob-buffers that are on the stack.

Signed-off-by: Nick Hainke <vincent@systemli.org>
---
 babeld/src/ubus.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/babeld/src/ubus.c b/babeld/src/ubus.c
index c1a4945..461ba5e 100644
--- a/babeld/src/ubus.c
+++ b/babeld/src/ubus.c
@@ -74,6 +74,8 @@ static int babeld_ubus_babeld_info(struct ubus_context *ctx_local,
   if (ret)
     fprintf(stderr, "Failed to send reply: %s\n", ubus_strerror(ret));
 
+  blob_buf_free(&b);
+
   return ret;
 }
 
@@ -144,6 +146,8 @@ static int babeld_ubus_get_xroutes(struct ubus_context *ctx_local,
   if (ret)
     fprintf(stderr, "Failed to send reply: %s\n", ubus_strerror(ret));
 
+  blob_buf_free(&b);
+
   return ret;
 }
 
@@ -247,6 +251,8 @@ static int babeld_ubus_get_routes(struct ubus_context *ctx_local,
   if (ret)
     fprintf(stderr, "Failed to send reply: %s\n", ubus_strerror(ret));
 
+  blob_buf_free(&b);
+
   return ret;
 }
 
@@ -317,6 +323,8 @@ static int babeld_ubus_get_neighbours(struct ubus_context *ctx_local,
   if (ret)
     fprintf(stderr, "Failed to send reply: %s\n", ubus_strerror(ret));
 
+  blob_buf_free(&b);
+
   return ret;
 }
 
@@ -383,6 +391,7 @@ void ubus_notify_route(struct babel_route *route, int kind) {
   babeld_add_route_buf(route, &b);
   snprintf(method, sizeof(method), "route.%s", local_kind(kind));
   ubus_notify(shared_ctx, &babeld_object, method, b.head, -1);
+  blob_buf_free(&b);
 }
 
 void ubus_notify_xroute(struct xroute *xroute, int kind) {
@@ -403,6 +412,7 @@ void ubus_notify_xroute(struct xroute *xroute, int kind) {
   babeld_add_xroute_buf(xroute, &b);
   snprintf(method, sizeof(method), "xroute.%s", local_kind(kind));
   ubus_notify(shared_ctx, &babeld_object, method, b.head, -1);
+  blob_buf_free(&b);
 }
 
 void ubus_notify_neighbour(struct neighbour *neigh, int kind) {
@@ -422,6 +432,7 @@ void ubus_notify_neighbour(struct neighbour *neigh, int kind) {
   babeld_add_neighbour_buf(neigh, &b);
   snprintf(method, sizeof(method), "neigh.%s", local_kind(kind));
   ubus_notify(shared_ctx, &babeld_object, method, b.head, -1);
+  blob_buf_free(&b);
 }
 
 void babeld_ubus_receive(fd_set *readfds) {