From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224pHx3VY6jddLrBpiuWCXIiPbErsjw8psgGmUAJA1IcpE7NvQd53XCWWWrNqvg6hjCj0Yk8 ARC-Seal: i=1; a=rsa-sha256; t=1519217775; cv=none; d=google.com; s=arc-20160816; b=kO8h7QPCVBeEZb4dKj4n1pRw2J+zxbhdv0FPWqzbx1uHatOfaXR2/y1agHmLB4wnEz Pp63MwvOzFoxIPvAqAC+6PYLRB2zcZsbWQ/XzmsAffUGr25ANzVUBceUiKs4cXTL1LDv qb3q3yOMzYWKDkXVQaVlUe3s422syZmZxG6fOjFfrAG3GkRpvVk4ALeb9zUD3yY4G6as gADAYhzibLF4yk8Cw+p4yYYhOwSbzAIgzXUrDnZbM/pDPDWP0pHzdLVzQUgbW3KgHs7Z +Lf9Z7zh4S8A+eGKMlBeAUTIVtxPf0F4FsB44LsUyK4fC+Jk0pgVx2E/DGao/6lTYf9d qgeg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=kfnZTumOzjeDrwFhksVs+aauo7sKDnROKLl38RTK0r8=; b=ycoTyDx/hwQPGLjvNmQ5zLAzHTy2172SAVjejc6Ca91OilERzekYUSVvdsT08dqqQ/ EYyBWGs6UNt9t4BWIUTJUXrK3x0+guerkbBSJUU2OBo5LzeUpJvUHkYUFcaj9FQLYJSL rpjOCM0bQyVYVVC+/vwiC4OdT2v9W/vFjNBXF3yynDXdBiyuRK53fmn9RRWYylKE6NW1 g7wbWqloplHvvKmugzHkjjGE/ZZfGus5OpRifCKC7gvSvY1nhvUyaRVkz+8I5Nxxn4ng yktDlQ1pRUQQDzBbU0/MnDmpKHRTk9HBrp7TLIrc3m1LGYLA00qdUlrrNi3fN4Z+HBAp jaZw== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.71.90 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jean-Christophe PLAGNIOL-VILLARD , Nicolas Ferre , Alexandre Belloni , Johan Hovold , Bartlomiej Zolnierkiewicz Subject: [PATCH 4.9 14/77] video: fbdev: atmel_lcdfb: fix display-timings lookup Date: Wed, 21 Feb 2018 13:48:23 +0100 Message-Id: <20180221124432.767583629@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180221124432.172390020@linuxfoundation.org> References: <20180221124432.172390020@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593014629325392076?= X-GMAIL-MSGID: =?utf-8?q?1593015298084145648?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Johan Hovold commit 9cb18db0701f6b74f0c45c23ad767b3ebebe37f6 upstream. Fix child-node lookup during probe, which ended up searching the whole device tree depth-first starting at the parent rather than just matching on its children. To make things worse, the parent display node was also prematurely freed. Note that the display and timings node references are never put after a successful dt-initialisation so the nodes would leak on later probe deferrals and on driver unbind. Fixes: b985172b328a ("video: atmel_lcdfb: add device tree suport") Cc: stable # 3.13 Cc: Jean-Christophe PLAGNIOL-VILLARD Cc: Nicolas Ferre Cc: Alexandre Belloni Signed-off-by: Johan Hovold Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Greg Kroah-Hartman --- drivers/video/fbdev/atmel_lcdfb.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/drivers/video/fbdev/atmel_lcdfb.c +++ b/drivers/video/fbdev/atmel_lcdfb.c @@ -1119,7 +1119,7 @@ static int atmel_lcdfb_of_init(struct at goto put_display_node; } - timings_np = of_find_node_by_name(display_np, "display-timings"); + timings_np = of_get_child_by_name(display_np, "display-timings"); if (!timings_np) { dev_err(dev, "failed to find display-timings node\n"); ret = -ENODEV; @@ -1140,6 +1140,12 @@ static int atmel_lcdfb_of_init(struct at fb_add_videomode(&fb_vm, &info->modelist); } + /* + * FIXME: Make sure we are not referencing any fields in display_np + * and timings_np and drop our references to them before returning to + * avoid leaking the nodes on probe deferral and driver unbind. + */ + return 0; put_timings_node: