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netlink: Fix rmem check in netlink_broadcast_deliver(). 

commit a3c4a125ec725cefb40047eb05ff9eafd57830b4 upstream.

We need to allow queuing at least one skb even when skb is
larger than sk->sk_rcvbuf.

The cited commit made a mistake while converting a condition
in netlink_broadcast_deliver().

Let's correct the rmem check for the allow-one-skb rule.

Fixes: ae8f160e7eb24 ("netlink: Fix wraparounds of sk->sk_rmem_alloc.")
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20250711053208.2965945-1-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit ce2ac2e46719e948555a9d57594745271c1429f9)
This commit is contained in:
Kuniyuki Iwashima 2025-07-11 05:32:07 +00:00 committed by Wentao Guan
parent 31ffe9d34a
commit 803ffc1969
1 changed files with 1 additions and 1 deletions
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2
net/netlink/af_netlink.c
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@ -1405,7 +1405,7 @@ static int netlink_broadcast_deliver(struct sock *sk, struct sk_buff *skb)
rmem = atomic_add_return(skb->truesize, &sk->sk_rmem_alloc);
rcvbuf = READ_ONCE(sk->sk_rcvbuf);
if ((rmem != skb->truesize || rmem <= rcvbuf) &&
if ((rmem == skb->truesize || rmem <= rcvbuf) &&
!test_bit(NETLINK_S_CONGESTED, &nlk->state)) {
netlink_skb_set_owner_r(skb, sk);
__netlink_sendskb(sk, skb);