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 C711D4ADDA3 for ; Thu, 2 Jul 2026 13:54:17 +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=1783000459; cv=none; b=fgnLP4hTB5enoEX4umt2kTdWhd9+vhTzgSD3KPGTDFZmTxrRc9eprpcZf4KXFMD0uQYRjwCy3LIqY692QsbfnhDKGm3S4W/ns9e1HFYOhZnSCKS0x2ML/wf+cFJBYR3pKJqNXhQCvLqkQGZegxeLufIROOY9c0sCc1okwKErGOw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1783000459; c=relaxed/simple; bh=VAoF5I1m0xKbIkEN2rItMHrU+BZX5ylcfre9Qy9lVg0=; h=Subject:To:Cc:From:Date:Message-ID:MIME-Version:Content-Type; b=IJ0Q3ROdeUj4Mrt8i0OeQGcSS2Y4+jhqtIJP2x3073gvUoSPo7g5Tx6RKI/Hr6gp5sRkBQRPUsgHTXsRt922IWUDlX9yzj5X/Ytf75tLgPmIGbBDVm1g3MHTauT6VmuFEh/Fx27ecJjgiaOrJzVoV/ah5HxelTFhfzPpagN/oBU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=V0WOKEMh; 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="V0WOKEMh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 35D831F00A3A; Thu, 2 Jul 2026 13:54:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1783000457; bh=pLSN68yr0iLODpXPWCVUD9mMCbIhhPBAb8pWv8TWxv0=; h=Subject:To:Cc:From:Date; b=V0WOKEMhV74B+FnsHjRUdOBDEytuDcJHa+2HSQdK5YgHz37G/eQyMGtW3SZPRbP7k fdGqVI+iUIJGmQruFPRmE3ZQcaB4hdnomJ8Pt63zeHM8b13pKIS0LW3ijxveXIPOz1 ZPsykQhFtcxOEzKrBgPBgo8OcL8rB/+3SNywDNos= Subject: FAILED: patch "[PATCH] nfsd: release layout stid on setlease failure" failed to apply to 6.12-stable tree To: clm@meta.com,chuck.lever@oracle.com,jlayton@kernel.org Cc: From: Date: Thu, 02 Jul 2026 15:54:26 +0200 Message-ID: <2026070226-viral-uncouth-aba2@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 6.12-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-6.12.y git checkout FETCH_HEAD git cherry-pick -x 30d55c8aabb261bc3f427d6b9aae7ef6206063f9 # git commit -s git send-email --to '' --in-reply-to '2026070226-viral-uncouth-aba2@gregkh' --subject-prefix 'PATCH 6.12.y' 'HEAD^..' Possible dependencies: thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 30d55c8aabb261bc3f427d6b9aae7ef6206063f9 Mon Sep 17 00:00:00 2001 From: Chris Mason Date: Mon, 18 May 2026 13:16:36 -0700 Subject: [PATCH] nfsd: release layout stid on setlease failure nfs4_alloc_stid() publishes the new stid into cl->cl_stateids via idr_alloc_cyclic() under cl_lock before returning to nfsd4_alloc_layout_stateid(). When nfsd4_layout_setlease() then fails, the error path frees the layout stateid directly with kmem_cache_free() without ever calling idr_remove(), leaving the IDR slot pointing at freed slab memory. Any subsequent IDR walker (states_show, client teardown) dereferences the dangling pointer. The correct teardown for an IDR-published stid is nfs4_put_stid(), which removes the IDR slot under cl_lock, dispatches sc_free (nfsd4_free_layout_stateid) to release ls->ls_file via nfsd4_close_layout(), and drops the nfs4_file reference in its tail. A second issue blocks that switch: nfsd4_free_layout_stateid() unconditionally inspects ls->ls_fence_work via delayed_work_pending() under ls_lock, but INIT_DELAYED_WORK(&ls->ls_fence_work, ...) currently runs only after the setlease call. On the setlease-failure path the destructor would touch an uninitialized delayed_work. nfsd4_alloc_layout_stateid() nfs4_alloc_stid() /* idr_alloc_cyclic under cl_lock */ nfsd4_layout_setlease() /* fails */ nfs4_put_stid() nfsd4_free_layout_stateid() delayed_work_pending(&ls->ls_fence_work) /* needs INIT */ nfsd4_close_layout() /* nfsd_file_put(ls->ls_file) */ put_nfs4_file() Fix by hoisting the ls_fenced / ls_fence_delay / INIT_DELAYED_WORK initialization above the nfsd4_layout_setlease() call, and replace the manual nfsd_file_put + put_nfs4_file + kmem_cache_free cleanup with a single nfs4_put_stid(stp). Fixes: c5c707f96fc9 ("nfsd: implement pNFS layout recalls") Cc: stable@vger.kernel.org Assisted-by: kres (claude-opus-4-7) Signed-off-by: Chris Mason Reviewed-by: Jeff Layton Signed-off-by: Chuck Lever diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c index c550b83f4432..f34320e4c2f4 100644 --- a/fs/nfsd/nfs4layouts.c +++ b/fs/nfsd/nfs4layouts.c @@ -253,10 +253,12 @@ nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, ls->ls_file = find_any_file(fp); BUG_ON(!ls->ls_file); + ls->ls_fenced = false; + ls->ls_fence_delay = 0; + INIT_DELAYED_WORK(&ls->ls_fence_work, nfsd4_layout_fence_worker); + if (nfsd4_layout_setlease(ls)) { - nfsd_file_put(ls->ls_file); - put_nfs4_file(fp); - kmem_cache_free(nfs4_layout_stateid_cache, ls); + nfs4_put_stid(stp); return NULL; } @@ -269,10 +271,6 @@ nfsd4_alloc_layout_stateid(struct nfsd4_compound_state *cstate, list_add(&ls->ls_perfile, &fp->fi_lo_states); spin_unlock(&fp->fi_lock); - ls->ls_fenced = false; - ls->ls_fence_delay = 0; - INIT_DELAYED_WORK(&ls->ls_fence_work, nfsd4_layout_fence_worker); - trace_nfsd_layoutstate_alloc(&ls->ls_stid.sc_stateid); return ls; }