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 AE71015C82 for ; Mon, 5 Dec 2022 19:20:16 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E34AC433D6; Mon, 5 Dec 2022 19:20:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1670268016; bh=1sLharsBAkt90pSKVUMd50YBlh+hgXuwHd7ppPfuMS0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aMVTo/GQSou3+XCwAH0DG9uv/BJ3DQX7c1OHxuQ8AKYkJpMqzjb9h/IeqYFjaNE6K 7/Fl9Luk0NNeW2UZtP9oagsp4izowVInJ9on/jrQ+sDEHFu4KDyYGMGeX0HXktY8La 0+mkCHu5QB0mUIA1rTLeR7XyASiugFpn/Qd1GaoI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Anand Jain , David Sterba Subject: [PATCH 4.19 055/105] btrfs: free btrfs_path before copying subvol info to userspace Date: Mon, 5 Dec 2022 20:09:27 +0100 Message-Id: <20221205190805.011900646@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221205190803.124472741@linuxfoundation.org> References: <20221205190803.124472741@linuxfoundation.org> User-Agent: quilt/0.67 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 From: Anand Jain commit 013c1c5585ebcfb19c88efe79063d0463b1b6159 upstream. btrfs_ioctl_get_subvol_info() frees the search path after the userspace copy from the temp buffer @subvol_info. This can lead to a lock splat warning. Fix this by freeing the path before we copy it to userspace. CC: stable@vger.kernel.org # 4.19+ Signed-off-by: Anand Jain Reviewed-by: David Sterba Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/ioctl.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2759,6 +2759,8 @@ static int btrfs_ioctl_get_subvol_info(s } } + btrfs_free_path(path); + path = NULL; if (copy_to_user(argp, subvol_info, sizeof(*subvol_info))) ret = -EFAULT;