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 0B56D476CFB; Mon, 31 Aug 2026 13:53:02 +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=1788184384; cv=none; b=FlMyGkVF97UoBsXwmPhcMCxoSEaPUYDFD8NW/sMhaCvSOELlCO12TXGcu4DEp0fS6ORyQVRaKXTkPDhmHyxOC9MK4BI5OInprK5UofLwTblOBoyWf6JLlDMMgHR3J9Qe38naYVnWFllz/biEtGuauHAl36DV3RYZKjGHntsCsfc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788184384; c=relaxed/simple; bh=f1JgYYUW6aJxqvqok8o9kBvfWhyc6+I7bKGnVUjhlYQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=owKIiviIWi+21DhA6ZmQ+eoL6rEpxQCtpydF4V0oOiGI/RT9g5F626ESFWyPVW/WTwEQiOuUMLB6hkcxtqFyNUNzeo357hps6Pz6EGZIdPzk1nVobzgEQ54OWLuO9pxLV9uiG8cPGGta+CH2vNIif/c6u4q031XWv/oOy0HmJA0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kOOsV74I; 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="kOOsV74I" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4E8951F00A3D; Mon, 31 Aug 2026 13:53:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788184382; bh=zMbY4kRvXub2UTny/gmsBFmNJY1W1Dt/rxLQ6ReKDZI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=kOOsV74I/QeRYLxqZiL4m401eGjbdj+ub9smv029vMPHADZQ1TDux8wFKuTirmuFK fMMdGAfl01ORX1JFnsYKj3hiEn7vLL1bM5G2s38DmTXnelZwdRjn3yvVbBghMYrk5D P7cSO5uLKHy4FcpNbO3aJXKcXRdrgd9NZ/Wu+3+4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Baokun Li , Miklos Szeredi Subject: [PATCH 6.12 61/99] fuse: fix invalidate lock leak on setattr writeback failure Date: Mon, 31 Aug 2026 15:34:30 +0200 Message-ID: <20260831133403.065618411@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260831133359.740409777@linuxfoundation.org> References: <20260831133359.740409777@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-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Baokun Li commit 9afeca0d569c9fc89d758fe7a9339d1e8afb1546 upstream. fuse_do_setattr() takes filemap_invalidate_lock() for a DAX truncate (fault_blocked = true) and releases it at the out:/error: labels. But when a writeback flush is also needed, a write_inode_now() failure returns directly and leaks the lock, so any later fault or truncate on the file stalls on the stale rwsem. For example, truncate(2) on a setuid file reaches fuse_do_setattr() with both ATTR_SIZE and ATTR_MODE set: truncate(2) └─ do_truncate() ├─ dentry_needs_remove_privs() # S_ISUID └─ notify_change() # KILL_SUID -> ATTR_MODE └─ fuse_setattr() # no killpriv: │ # ia_valid |= ATTR_MODE └─ fuse_do_setattr() ├─ filemap_invalidate_lock() # IS_DAX && is_truncate └─ write_inode_now() # is_wb && ATTR_MODE └─ if (err) # e.g. daemon -> -EIO return err # <- lock leaked Fix this by adding an unlock label that releases the lock before returning the error, and use it for the fuse_dax_break_layouts() failure path as well. Fixes: 6ae330cad6ef ("virtiofs: serialize truncate/punch_hole and dax fault path") Cc: stable@vger.kernel.org # v5.10+ Signed-off-by: Baokun Li Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/fuse/dir.c | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) --- a/fs/fuse/dir.c +++ b/fs/fuse/dir.c @@ -1940,10 +1940,8 @@ int fuse_do_setattr(struct mnt_idmap *id filemap_invalidate_lock(mapping); fault_blocked = true; err = fuse_dax_break_layouts(inode, 0, -1); - if (err) { - filemap_invalidate_unlock(mapping); - return err; - } + if (err) + goto unlock; } if (attr->ia_valid & ATTR_OPEN) { @@ -1970,7 +1968,7 @@ int fuse_do_setattr(struct mnt_idmap *id ATTR_TIMES_SET)) { err = write_inode_now(inode, true); if (err) - return err; + goto unlock; fuse_set_nowrite(inode); fuse_release_nowrite(inode); @@ -2078,6 +2076,7 @@ error: clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state); +unlock: if (fault_blocked) filemap_invalidate_unlock(mapping); return err;