netdev - [PATCH net] phonet: fix rtm_phonet

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Message-ID: <20240502161700.1804476-1-edumazet@google.com>
Date: Thu,  2 May 2024 16:17:00 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com, 
	Eric Dumazet <edumazet@...gle.com>, Remi Denis-Courmont <courmisch@...il.com>
Subject: [PATCH net] phonet: fix rtm_phonet_notify() skb allocation

fill_route() stores three components in the skb:

- struct rtmsg
- RTA_DST (u8)
- RTA_OIF (u32)

Therefore, rtm_phonet_notify() should use

NLMSG_ALIGN(sizeof(struct rtmsg)) +
nla_total_size(1) +
nla_total_size(4)

Fixes: f062f41d0657 ("Phonet: routing table Netlink interface")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Cc: Remi Denis-Courmont <courmisch@...il.com>
---
 net/phonet/pn_netlink.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/phonet/pn_netlink.c b/net/phonet/pn_netlink.c
index 59aebe29689077bfa77d37516aea4617fe3b8a50..dd4c7e9a634fbe29645107de04a90688cdfb1a01 100644
--- a/net/phonet/pn_netlink.c
+++ b/net/phonet/pn_netlink.c
@@ -193,7 +193,7 @@ void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
 	struct sk_buff *skb;
 	int err = -ENOBUFS;
 
-	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
+	skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct rtmsg)) +
 			nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
 	if (skb == NULL)
 		goto errout;
-- 
2.45.0.rc0.197.gbae5840b3b-goog