From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 98EFE3D45CB; Tue, 16 Jun 2026 18:14:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781633679; cv=none; b=DgXruEaUuuMIqAaOvvG7gDETdaxY7Dzqfz58NwqlJvmuQRl0AIbqTLXUQL9scXOVP2BxsCPyT3/Qj7wm+QvYssb78pjAhEBtZ89KCHGr+xlnW4wbgFONO00/HzjF1gTU56ad1/pZYx/buYbtl8Puyk0jclpOcfwa2KSmBlEEzFc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781633679; c=relaxed/simple; bh=Q5anU0VdRhBOOI8KsHqlUvV9SnaHnEjG+0/K+OnOhsQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=rvZ1nIy96Ilqrq0+NTwl0krbOO9yGwacftNzL4A2z/ok8f//crw9kCi+vWW3ecHWp3kYQ8vGSRUjOO9VC46zuRYBgeLf0ZZGN9qAd/nb2G6XFrhjo+YQLnhqJc19lXgtOdeDv98fn0P/5yc+CmP02PC2I8AvI4tryhQIAItT/54= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=MWG4Qw/7; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="MWG4Qw/7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 39CBE1F000E9; Tue, 16 Jun 2026 18:14:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781633677; bh=1pEdfZjf/dKl2iTH1oygF2mK7HTtOJUmXiTOliClzjs=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=MWG4Qw/7xEZVpqawjNOq54DKTSAOSiMfQjcTg+1az4jTd9eKkW9cQ6FUFDobZAz9p miPPRgjqg5lhAgdx7eA8ti/fuLFyhJbXXxx0Yyk8mjs4bmbx/3+LiakVjQZpxroz2/ ppWQgDmueQuagvXGg4V1Ni7DwsSg9wh6t3nevsaU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable@kernel.org, Yuan Tan , Xin Liu , Luxing Yin , Zhengchuan Liang , Ren Wei , Steffen Klassert Subject: [PATCH 5.15 091/411] xfrm: input: hold netns during deferred transport reinjection Date: Tue, 16 Jun 2026 20:25:29 +0530 Message-ID: <20260616145105.063509734@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145100.376842714@linuxfoundation.org> References: <20260616145100.376842714@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Zhengchuan Liang commit c16f74dc1d75d0e2e7670076d5375deda110ebeb upstream. Transport-mode reinjection stores a struct net pointer in skb->cb and uses it later from xfrm_trans_reinject(). That pointer must stay valid until the deferred callback runs. Take a netns reference when queueing deferred reinjection work and drop it after the callback completes. Use maybe_get_net() so the queueing path does not revive a namespace that is already being torn down. This keeps the existing workqueue design and fixes the netns lifetime handling in one place for all users of xfrm_trans_queue_net(). Fixes: 7b3801927e52 ("xfrm: introduce xfrm_trans_queue_net") Cc: stable@kernel.org Reported-by: Yuan Tan Reported-by: Xin Liu Co-developed-by: Luxing Yin Signed-off-by: Luxing Yin Signed-off-by: Zhengchuan Liang Signed-off-by: Ren Wei Assisted-by: Codex:gpt-5.4 Signed-off-by: Steffen Klassert Signed-off-by: Greg Kroah-Hartman --- net/xfrm/xfrm_input.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) --- a/net/xfrm/xfrm_input.c +++ b/net/xfrm/xfrm_input.c @@ -781,9 +781,12 @@ static void xfrm_trans_reinject(struct w spin_unlock_bh(&trans->queue_lock); local_bh_disable(); - while ((skb = __skb_dequeue(&queue))) - XFRM_TRANS_SKB_CB(skb)->finish(XFRM_TRANS_SKB_CB(skb)->net, - NULL, skb); + while ((skb = __skb_dequeue(&queue))) { + struct net *net = XFRM_TRANS_SKB_CB(skb)->net; + + XFRM_TRANS_SKB_CB(skb)->finish(net, NULL, skb); + put_net(net); + } local_bh_enable(); } @@ -792,6 +795,7 @@ int xfrm_trans_queue_net(struct net *net struct sk_buff *)) { struct xfrm_trans_tasklet *trans; + struct net *hold_net; trans = this_cpu_ptr(&xfrm_trans_tasklet); @@ -800,8 +804,12 @@ int xfrm_trans_queue_net(struct net *net BUILD_BUG_ON(sizeof(struct xfrm_trans_cb) > sizeof(skb->cb)); + hold_net = maybe_get_net(net); + if (!hold_net) + return -ENODEV; + XFRM_TRANS_SKB_CB(skb)->finish = finish; - XFRM_TRANS_SKB_CB(skb)->net = net; + XFRM_TRANS_SKB_CB(skb)->net = hold_net; spin_lock_bh(&trans->queue_lock); __skb_queue_tail(&trans->queue, skb); spin_unlock_bh(&trans->queue_lock);