From 9fe602a17ca9de244eb4c97df613c9c7509cc3ad Mon Sep 17 00:00:00 2001
From: David Lamparter <equinox@diac24.net>
Date: Wed, 13 Nov 2019 15:42:32 +0100
Subject: [PATCH] lib: make rcu_free() NULL-safe

Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
---
 lib/frrcu.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/frrcu.h b/lib/frrcu.h
index 8f789303cc..06d87c39f1 100644
--- a/lib/frrcu.h
+++ b/lib/frrcu.h
@@ -139,6 +139,8 @@ extern void rcu_enqueue(struct rcu_head *head, const struct rcu_action *action);
 #define rcu_free(mtype, ptr, field)                                            \
 	do {                                                                   \
 		typeof(ptr) _ptr = (ptr);                                      \
+		if (!_ptr)                                                     \
+			break;                                                 \
 		struct rcu_head *_rcu_head = &_ptr->field;                     \
 		static const struct rcu_action _rcu_action = {                 \
 			.type = RCUA_FREE,                                     \
-- 
2.39.5