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 91B1730C34A; Mon, 13 Apr 2026 16:29:37 +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=1776097777; cv=none; b=kyX+ad0RN69MytrfHzv7YoBZnOuF8J/8TEs/ege6oTFZQX1Ma8QEctOCF5n16ushtGIayycv+ikII0qlM685vHivYb3E2zxsSDfdytC4IMpEuKE8tlOixpbQXTiOyBO0uza9qG/tugGWY0ySyE+ulokqMcCy84sbKS+VarjrWE0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776097777; c=relaxed/simple; bh=JBpSQ2hDccfHd8wa6KcVFYEWnNPYTjIL8UFkS6vFC/k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mG/M4hTYDnQKxGb8XCtlT59bLLLPcwmrliUP9bcRSufhG4DSJ5IZhQ5oQ7IhITVNjPJsF3q7n4iVvLaCS+8I54PquztTad4W/QjM5OIO3F9stwlBQzsx69J3W+URt3QKNLw1quaGFk6gVklqPECiYg9bLuDgEWFPEks6LRjknOk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=FRtlmkrq; 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="FRtlmkrq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DA9B4C2BCAF; Mon, 13 Apr 2026 16:29:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776097777; bh=JBpSQ2hDccfHd8wa6KcVFYEWnNPYTjIL8UFkS6vFC/k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FRtlmkrqSEivPQN1emEm25vqFrKUSr4u5lilhFr3Avqyo4+1heh+fQWZA2rsSjvNq gD+RjXLvYCFxn8fcXAcZNhnCVqBDUODMT4fQgxqLLcRwtUYGtIecLnbko7vZiGs9gb eVX33CHUGh1EsV57JbtkU+u9CYVzG5aV+BIkedSU= 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 5.15 226/570] ksmbd: call ksmbd_vfs_kern_path_end_removing() on some error paths Date: Mon, 13 Apr 2026 17:55:57 +0200 Message-ID: <20260413155838.920506215@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260413155830.386096114@linuxfoundation.org> References: <20260413155830.386096114@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-Transfer-Encoding: 8bit 5.15-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/ksmbd/smb2pdu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -5652,14 +5652,14 @@ 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)