From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 755043B4EB7; Mon, 23 Mar 2026 15:10:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774278631; cv=none; b=dzFXVRJaFmqvl5XcRnZT8J7XpKIrMld8jL+RyuZkBWn9VVuPycJD2hffTose/r+1dL7E4JlB/GM93WgT7ijb2CALCWoy/EfTZ3kBlQpxsbgQYa3xKrnm43r4hUKlKOrZDAS+4dYeCeIKzrZSwpzQ60SCi8TU+M2FaI+pvDMTCXw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774278631; c=relaxed/simple; bh=1eyP1xfxPtN+ldoI/lIaHc3mepvgqqt6nvQ/EpCQp0I=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qfkmVAZx4CHDsgLywu/10tJTIQ5z3X0o/tdelusvFAEFmWVPXncXb9UevMgwAsclgp/VFrxnm4zKCiyLTpbTHEwjlYNfb8ZdjuF+Cd8hmmE15JYKN8UN1t0Afv80CZXFin/d817hzK9GdG1gennDGhAl1eb9+USv9rOa8pKMwMg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=PSK8aYnN; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="PSK8aYnN" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6FA4C4CEF7; Mon, 23 Mar 2026 15:10:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1774278631; bh=1eyP1xfxPtN+ldoI/lIaHc3mepvgqqt6nvQ/EpCQp0I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PSK8aYnNcYU3024Xcjx2hl8//8iiEkx3NlhLi8hbfIiE3TJNo3Y/kEHvXoaSQAB6T kG4D+h25W3f/Fg2kcvSjH40XBKsKgwYowpuJ8XLdnDfhsLF9p7LTqpnvBS/sMJkw3t lntVkH+BTQ5b9XuQVLaDgPQ6qLzpAm/HgXziaZWs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Fedor Pchelkin , Namjae Jeon , Steve French , Sasha Levin Subject: [PATCH 6.6 367/567] ksmbd: call ksmbd_vfs_kern_path_end_removing() on some error paths Date: Mon, 23 Mar 2026 14:44:47 +0100 Message-ID: <20260323134542.898819941@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260323134533.749096647@linuxfoundation.org> References: <20260323134533.749096647@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Fedor Pchelkin [ Upstream commit a09dc10d1353f0e92c21eae2a79af1c2b1ddcde8 ] There are two places where ksmbd_vfs_kern_path_end_removing() needs to be called in order to balance what the corresponding successful call to ksmbd_vfs_kern_path_start_removing() has done, i.e. drop inode locks and put the taken references. Otherwise there might be potential deadlocks and unbalanced locks which are caught like: BUG: workqueue leaked lock or atomic: kworker/5:21/0x00000000/7596 last function: handle_ksmbd_work 2 locks held by kworker/5:21/7596: #0: ffff8881051ae448 (sb_writers#3){.+.+}-{0:0}, at: ksmbd_vfs_kern_path_locked+0x142/0x660 #1: ffff888130e966c0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: ksmbd_vfs_kern_path_locked+0x17d/0x660 CPU: 5 PID: 7596 Comm: kworker/5:21 Not tainted 6.1.162-00456-gc29b353f383b #138 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014 Workqueue: ksmbd-io handle_ksmbd_work Call Trace: dump_stack_lvl+0x44/0x5b process_one_work.cold+0x57/0x5c worker_thread+0x82/0x600 kthread+0x153/0x190 ret_from_fork+0x22/0x30 Found by Linux Verification Center (linuxtesting.org). Fixes: d5fc1400a34b ("smb/server: avoid deadlock when linking with ReplaceIfExists") Cc: stable@vger.kernel.org Signed-off-by: Fedor Pchelkin Acked-by: Namjae Jeon Signed-off-by: Steve French [ ksmbd_vfs_kern_path_end_removing() call -> ksmbd_vfs_kern_path_unlock() ] Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- fs/smb/server/smb2pdu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/smb/server/smb2pdu.c +++ b/fs/smb/server/smb2pdu.c @@ -6067,14 +6067,14 @@ static int smb2_create_link(struct ksmbd rc = -EINVAL; ksmbd_debug(SMB, "cannot delete %s\n", link_name); - goto out; } } else { rc = -EEXIST; ksmbd_debug(SMB, "link already exists\n"); - goto out; } ksmbd_vfs_kern_path_unlock(&parent_path, &path); + if (rc) + goto out; } rc = ksmbd_vfs_link(work, target_name, link_name); if (rc)