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 8A62E5476D9 for ; Wed, 9 Sep 2026 11:31:03 +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=1788953464; cv=none; b=icg9Zf+ggurQVzFPj6gmy5Rd7zCo7V+sWYjj326K6fIQ/f1LPgUuZ91OYbeyI2TtH3n/Mx8jQiQUSWejYVkMSWp3CZd9I+jW3giGH/QEHYlvjgphbn3Ins77F6Jciai/P5aEg4+yHRQIsOiVKBO3KrGpVBHoYl2DwBP7mRQasHo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788953464; c=relaxed/simple; bh=3lL6PtbTI6e+Yn9k1Nv5F5iJXhVGmBCcUMFBnuSKYNk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=pc7OonTsM0+XUV7TD10RlzqrEAhKSzauWvCLxyUkv6k6Lbl++xsGZ1VcJGR2g/Sj6pAvulSWuuirxFUbZDX8EgPkzrjKMCjD/NgOg4NjqtcvZvtHQmgH8APBs3AU0sPn6RNuuCZN6OGcS/xF3s67C7HTO2cuPE7lyYkGHnPC3sA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=AXl6oGYy; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="AXl6oGYy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE8C11F00A3E; Wed, 9 Sep 2026 11:31:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1788953463; bh=psk+RY2uFzA9kj3TLXwA5d7nT/Eknu2nVDDf2XEwAoQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AXl6oGYyPSP8qQgGWQIm2GSPn5lg7AMOgvv0LMqPBBJlCKow/+cqG462z97w8U2QC 6JFcxPR6acm/1atXitKxq+RWEUIKKnsdK3CLeoM2YB4Mf8hURvfcQ1cpV0e0KG6mWC ZRNmEFSkCg0tj1qFkNvKrvrVh03iaG6pmuGnfgcJxoLdVdAaiWwyGnivsQ56nedwIH Q+Xkhrp9nEUIO6ZApwTR3QgZ809hfNlxyyp/rXZUi1ogalaWO67KLcCYP+PAMQhICo c98q00Vyl9fWrVsmw4yn8eKrgeRfgAdUW++uMXVI+pAA1HaynO0pA/XnCl/XQAlrBB Qm+zgHxTqMzCQ== From: Sasha Levin To: stable@vger.kernel.org Cc: Shuangpeng Bai , Trond Myklebust , Sasha Levin Subject: [PATCH 6.1.y 2/2] lockd: fix NULL dereference on lockowner allocation failure Date: Wed, 9 Sep 2026 07:31:00 -0400 Message-ID: <20260909113100.1863001-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260909113100.1863001-1-sashal@kernel.org> References: <2026090351-duplex-next-aca8@gregkh> <20260909113100.1863001-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Shuangpeng Bai [ Upstream commit 4c7fc129db061c7daab841c4f3c342d894832362 ] 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 Signed-off-by: Sasha Levin --- fs/lockd/clntproc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/lockd/clntproc.c b/fs/lockd/clntproc.c index 32790a57351a5..bae25519771d1 100644 --- a/fs/lockd/clntproc.c +++ b/fs/lockd/clntproc.c @@ -479,9 +479,12 @@ 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; } -- 2.53.0