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 796F04AF66E for ; Thu, 3 Sep 2026 14:55:55 +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=1788447356; cv=none; b=R8gNijBX8U7r42tydkkCTnyqQ8ukbcC8EN/lxs/KTnAjL4lAdEbq1W2hWZNIMuEkfw0khQxJ+L1uBnoLR9SprMeajJFi6reY1ecWKpa+lMQv5jTw2XOAS5DAFiqJ9V+KAt1xw/ArqE7AVYVnrr8szW4qubOw5eNt46K9KaDreXI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788447356; c=relaxed/simple; bh=ucRVOy1LTwOddHWfpZfyIvZj85oT7v3H8a8zrCv4aos=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=i3PqOiIw9SbepDXjSjNjC+OxLiebT1QieFzxDOVY3mo9ARQJ1ojJZAtTvjweMl4dLwzen8djJ71mC7RYwQLhKXhNA+EzQaumfq1cqJVr137DJ6p/+ab+eendYXrJXVF01if+0ZeQXge0S+a3Jr29KyenKrKhprgysut9QzPigC0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=jtNvJZVL; 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="jtNvJZVL" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E4031F00A3A; Thu, 3 Sep 2026 14:55:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788447355; bh=cBj7kmCbb6HI6aQk12JeFePx8EcjisKlzGjSECnUkXQ=; h=Subject:To:Cc:From:Date; b=jtNvJZVLluwDStjllrLZjBIkL3U2dKTc2oumvHKJzUuL5he4kBupYnQqAJ7QCRfg8 dU85MS09A4inDz/zSNAJiPFUJfVf4BwQJgQOmzCALPZFO0w1tnMbjRdYiyxoNm/rSh 1Wh5MDvhaLUKeT91O2jGhkI0wmSOZTPxGabdJDFI= Subject: FAILED: patch "[PATCH] lockd: fix NULL dereference on lockowner allocation failure" failed to apply to 5.15-stable tree To: shuangpeng.kernel@gmail.com,trond.myklebust@hammerspace.com Cc: From: Date: Thu, 03 Sep 2026 16:32:51 +0200 Message-ID: <2026090351-huskiness-ecosphere-5753@gregkh> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . To reproduce the conflict and resubmit, you may use the following commands: git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.15.y git checkout FETCH_HEAD git cherry-pick -x 4c7fc129db061c7daab841c4f3c342d894832362 # git commit -s git send-email --to '' --in-reply-to '2026090351-huskiness-ecosphere-5753@gregkh' --subject-prefix 'PATCH 5.15.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 4c7fc129db061c7daab841c4f3c342d894832362 Mon Sep 17 00:00:00 2001 From: Shuangpeng Bai Date: Fri, 17 Jul 2026 13:28:09 -0400 Subject: [PATCH] lockd: fix NULL dereference on lockowner allocation failure nlmclnt_locks_init_private() installs NLM file lock operations even when nlmclnt_find_lockowner() fails to allocate a lockowner. nlmclnt_proc() then returns -ENOMEM, but the VFS still tears down the partially initialized file_lock and calls locks_release_private(). That invokes nlmclnt_locks_release_private(), which dereferences fl->fl_u.nfs_fl.owner and crashes because the owner was never installed. Clear fl_ops before attempting to initialize the NLM private state, and install the NLM lock operations only after a lockowner has been allocated successfully. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Cc: stable@vger.kernel.org Signed-off-by: Shuangpeng Bai Signed-off-by: Trond Myklebust diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index f06faf577cea..f8018bfe9c64 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -487,9 +487,12 @@ static const struct file_lock_operations nlmclnt_lock_ops = { static void nlmclnt_locks_init_private(struct file_lock *fl, struct nlm_host *host) { fl->fl_u.nfs_fl.state = 0; + fl->fl_ops = NULL; fl->fl_u.nfs_fl.owner = nlmclnt_find_lockowner(host, fl->c.flc_owner); INIT_LIST_HEAD(&fl->fl_u.nfs_fl.list); + if (!fl->fl_u.nfs_fl.owner) + return; fl->fl_ops = &nlmclnt_lock_ops; }