From nobody Fri Dec 19 20:33:13 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E8EF5FA3748 for ; Mon, 24 Oct 2022 14:11:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232256AbiJXOK6 (ORCPT ); Mon, 24 Oct 2022 10:10:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41224 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237300AbiJXOFT (ORCPT ); Mon, 24 Oct 2022 10:05:19 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 775823384C; Mon, 24 Oct 2022 05:49:58 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 1A82F61333; Mon, 24 Oct 2022 12:41:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2DA5DC433D6; Mon, 24 Oct 2022 12:41:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666615274; bh=0rrloa4rtQqIKSvTLKwV13mcbf1I5IqFkFUsilHWCIc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=i5ZDKfyL9XBTiIMD/CVKRugMEZTE0PgApDbqLKoHi2j+01gk0a59FKSCt3ncxNFhJ g53uLJIYHO957N1oC7pRNFJ0Egy+HRf+8Go9sCU6ruaH9anamShw/2xkN/AUp3HVtK ArhCtgVfkQJzWxJALOmHUKFoPn0Dgvk771Tf1irc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Liu Jian , Daniel Borkmann , John Fastabend , Sasha Levin Subject: [PATCH 5.15 188/530] skmsg: Schedule psock work if the cached skb exists on the psock Date: Mon, 24 Oct 2022 13:28:52 +0200 Message-Id: <20221024113053.551985903@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113044.976326639@linuxfoundation.org> References: <20221024113044.976326639@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Liu Jian [ Upstream commit bec217197b412d74168c6a42fc0f76d0cc9cad00 ] In sk_psock_backlog function, for ingress direction skb, if no new data packet arrives after the skb is cached, the cached skb does not have a chance to be added to the receive queue of psock. As a result, the cached skb cannot be received by the upper-layer application. Fix this by reschedu= le the psock work to dispose the cached skb in sk_msg_recvmsg function. Fixes: 604326b41a6f ("bpf, sockmap: convert to generic sk_msg interface") Signed-off-by: Liu Jian Signed-off-by: Daniel Borkmann Acked-by: John Fastabend Link: https://lore.kernel.org/bpf/20220907071311.60534-1-liujian56@huawei.c= om Signed-off-by: Sasha Levin --- net/core/skmsg.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) diff --git a/net/core/skmsg.c b/net/core/skmsg.c index 054073c7cbb9..736d8b035a67 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -435,8 +435,10 @@ int sk_msg_recvmsg(struct sock *sk, struct sk_psock *p= sock, struct msghdr *msg, if (copied + copy > len) copy =3D len - copied; copy =3D copy_page_to_iter(page, sge->offset, copy, iter); - if (!copy) - return copied ? copied : -EFAULT; + if (!copy) { + copied =3D copied ? copied : -EFAULT; + goto out; + } =20 copied +=3D copy; if (likely(!peek)) { @@ -456,7 +458,7 @@ int sk_msg_recvmsg(struct sock *sk, struct sk_psock *ps= ock, struct msghdr *msg, * didn't copy the entire length lets just break. */ if (copy !=3D sge->length) - return copied; + goto out; sk_msg_iter_var_next(i); } =20 @@ -478,7 +480,9 @@ int sk_msg_recvmsg(struct sock *sk, struct sk_psock *ps= ock, struct msghdr *msg, } msg_rx =3D sk_psock_peek_msg(psock); } - +out: + if (psock->work_state.skb && copied > 0) + schedule_work(&psock->work); return copied; } EXPORT_SYMBOL_GPL(sk_msg_recvmsg); --=20 2.35.1