From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pf1-f177.google.com (mail-pf1-f177.google.com [209.85.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B47AA18C010 for ; Thu, 14 Nov 2024 17:52:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.177 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731606732; cv=none; b=NwLWeyvWzAwUDrhU+jH16VIM1d9Q+e8dXjG+8+kB+wlAFTCxe7tFD3CG8ToGK8roTDiK5UMLizJHdDdZTnENno9RkWoJ1CvURh67Sy4XoW3xOaN/r3QaQkzrdsQ0RRhYevasp2A+eiy0DKVCxDpXemICcnlOubQ8aYvZgDhVt78= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731606732; c=relaxed/simple; bh=apJSFXQVNjB7nklns7r3B69WAfmXsi7qpL7x89a7NVc=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=bc2EKGiNHGFINtN4UzSMzM310xDyoMTKwXfk0cGKBhAI/motq5EcEyfuarvywQEmI/Wr1kRCw5BzUeqdeZn3yOuuEYkJI7YR6LVdlkWmNz6J6ojFxXKghu2qsjTGuWzk0A4IHSYzvCCAbxy8I2W382Pzci+QFbcE49D2XCui440= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fastly.com; spf=pass smtp.mailfrom=fastly.com; dkim=pass (1024-bit key) header.d=fastly.com header.i=@fastly.com header.b=Z0tJYeTx; arc=none smtp.client-ip=209.85.210.177 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=fastly.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=fastly.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=fastly.com header.i=@fastly.com header.b="Z0tJYeTx" Received: by mail-pf1-f177.google.com with SMTP id d2e1a72fcca58-72061bfec2dso678802b3a.2 for ; Thu, 14 Nov 2024 09:52:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fastly.com; s=google; t=1731606730; x=1732211530; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=Bpy3QdHD1PzWkQ/hC0jW+9k3dxQdnK5utepjrrTfjd4=; b=Z0tJYeTxLY2SOzcxCG/Imt1hqhcayGy+UVMSvjAAHWM25X/Z0J4BqmjeKTWcaCZnMz VO1KgBQu+dpBKU6EJ+k2Q3CQRJThiWAjYt6RTfNha5u4BDo4Z3NotFqhO5ov8/gO1hoy kJsR9WfqCkpMUzZun9eNlkVQbRsJ6Yjm6kOug= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1731606730; x=1732211530; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Bpy3QdHD1PzWkQ/hC0jW+9k3dxQdnK5utepjrrTfjd4=; b=KiFMF/upH0fqT0+ls4GAhYyEmHv4iy/FAtRwkisoFE21/MSPalvvfy8q+bihve1q+5 RrUXdyu4Je/gt8jc6+mzFsMBMrhpu9dvN/796jAKRjwrB6TaSKday6nFdl+tthFPXjMI wBzAR599QSp0mH9nGDKpVnFs+80d6/Uayz3L4umE6abH2rYG9/otPidrVlruG1ElvwBO n3sfyyqwKll/RIhy+GvreeQprocU8sXe/irIBlYYUZEez47nae3BqAX8LqAEU+D9b0Lc 7Qi0Cp3pPZV2+su6FfJkXflNnWxZVCOyYyLSHq2ArcrDA/sTm11WAesyLLYyjMq2wRdG mcng== X-Forwarded-Encrypted: i=1; AJvYcCUcU5b2PvWwboTMT4uGivvblrt1GO6sgTbpoJ0PIdW2ED9roH6rXNiTg2/wsw78NbxLHHx3NGIO5fLdmbI=@vger.kernel.org X-Gm-Message-State: AOJu0YyV/opwQMPDz7EsBY7i3kYTBnI5Azvc+AplwGcKHMfkGXMDcqwH FD4MzULvcTcL2Z8K0B/h3AzcC/k2cL1jTwC+MXud7rxDeGVQKjI+q23aD3mribw= X-Google-Smtp-Source: AGHT+IEzuOBbg7r/5j57WaldF3llHWkwbSqlB3tC2UE/jWFYwiTb0w9QGbjIr3D5ZFS7w2Dgt5FdwA== X-Received: by 2002:a05:6a00:1ca6:b0:724:6bac:1003 with SMTP id d2e1a72fcca58-7246bac1753mr3240414b3a.24.1731606729863; Thu, 14 Nov 2024 09:52:09 -0800 (PST) Received: from localhost.localdomain ([2620:11a:c019:0:65e:3115:2f58:c5fd]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7246a9bac56sm1559883b3a.141.2024.11.14.09.52.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Nov 2024 09:52:09 -0800 (PST) From: Joe Damato To: netdev@vger.kernel.org Cc: pabeni@redhat.com, edumazet@google.com, amritha.nambiar@intel.com, sridhar.samudrala@intel.com, kuba@kernel.org, mkarsten@uwaterloo.ca, Joe Damato , stable@vger.kernel.org, "David S. Miller" , Simon Horman , Mina Almasry , Xuan Zhuo , Stanislav Fomichev , linux-kernel@vger.kernel.org (open list) Subject: [PATCH net v3] netdev-genl: Hold rcu_read_lock in napi_get Date: Thu, 14 Nov 2024 17:51:56 +0000 Message-Id: <20241114175157.16604-1-jdamato@fastly.com> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hold rcu_read_lock in netdev_nl_napi_get_doit, which calls napi_by_id and is required to be called under rcu_read_lock. Cc: stable@vger.kernel.org Fixes: 27f91aaf49b3 ("netdev-genl: Add netlink framework functions for napi") Signed-off-by: Joe Damato --- v3: - Separate the patches that were a series in v2 (and earlier) as they target different trees. v2: - Simplified by removing the helper and calling rcu_read_lock / unlock directly instead. net/core/netdev-genl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/net/core/netdev-genl.c b/net/core/netdev-genl.c index 1cb954f2d39e..d2baa1af9df0 100644 --- a/net/core/netdev-genl.c +++ b/net/core/netdev-genl.c @@ -215,6 +215,7 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info) return -ENOMEM; rtnl_lock(); + rcu_read_lock(); napi = napi_by_id(napi_id); if (napi) { @@ -224,6 +225,7 @@ int netdev_nl_napi_get_doit(struct sk_buff *skb, struct genl_info *info) err = -ENOENT; } + rcu_read_unlock(); rtnl_unlock(); if (err) base-commit: 5b366eae71937ae7412365340b431064625f9617 -- 2.25.1