[PATCH 6.1 157/236] phonet: fix rtm_phonet_notify() skb allocation

Greg Kroah-Hartman
2024-05-14T11:34:51Z

From: Eric Dumazet <edumazet@google.com>

[ Upstream commit d8cac8568618dcb8a51af3db1103e8d4cc4aeea7 ]

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@google.com>
Acked-by: Rémi Denis-Courmont <courmisch@gmail.com>
Link: https://lore.kernel.org/r/20240502161700.1804476-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 59aebe2968907..dd4c7e9a634fb 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;
--
2.43.0