Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752845AbZLaPuz (ORCPT ); Thu, 31 Dec 2009 10:50:55 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752743AbZLaPum (ORCPT ); Thu, 31 Dec 2009 10:50:42 -0500 Received: from mail-ew0-f219.google.com ([209.85.219.219]:33387 "EHLO mail-ew0-f219.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752705AbZLaPs7 (ORCPT ); Thu, 31 Dec 2009 10:48:59 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=xcLEbefJ51jEubsb7i7wMrsBzyN6Cc843uF+r36K1knIQUMp6ksXNOsQqOIinOXoDk MsEA8XwrMu0dL8N9qhLp9DbaoH9lWe6NnrIfAeRJJ1PIyCDowzPu9lMxhRDV5aAiqY/j Q3eKcuWPbE4GnrzPk3fGCEG+HSzFe17gdGt48= From: Johan Hovold To: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold Subject: [PATCH 07/13] USB: keyspan_pda: fix DMA buffers on stack Date: Thu, 31 Dec 2009 16:48:03 +0100 Message-Id: <1262274489-12447-8-git-send-email-jhovold@gmail.com> X-Mailer: git-send-email 1.6.6 In-Reply-To: <1262037718-31424-1-git-send-email-jhovold@gmail.com> References: <1262037718-31424-1-git-send-email-jhovold@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3587 Lines: 129 Signed-off-by: Johan Hovold --- drivers/usb/serial/keyspan_pda.c | 45 +++++++++++++++++++++++++++---------- 1 files changed, 33 insertions(+), 12 deletions(-) diff --git a/drivers/usb/serial/keyspan_pda.c b/drivers/usb/serial/keyspan_pda.c index 1296a09..427d377 100644 --- a/drivers/usb/serial/keyspan_pda.c +++ b/drivers/usb/serial/keyspan_pda.c @@ -429,13 +429,20 @@ static int keyspan_pda_get_modem_info(struct usb_serial *serial, unsigned char *value) { int rc; - unsigned char data; + u8 *data; + + data = kmalloc(1, GFP_KERNEL); + if (!data) + return -ENOMEM; + rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 3, /* get pins */ USB_TYPE_VENDOR|USB_RECIP_INTERFACE|USB_DIR_IN, - 0, 0, &data, 1, 2000); + 0, 0, data, 1, 2000); if (rc >= 0) - *value = data; + *value = *data; + + kfree(data); return rc; } @@ -543,7 +550,14 @@ static int keyspan_pda_write(struct tty_struct *tty, device how much room it really has. This is done only on scheduler time, since usb_control_msg() sleeps. */ if (count > priv->tx_room && !in_interrupt()) { - unsigned char room; + u8 *room; + + room = kmalloc(1, GFP_KERNEL); + if (!room) { + rc = -ENOMEM; + goto exit; + } + rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 6, /* write_room */ @@ -551,9 +565,14 @@ static int keyspan_pda_write(struct tty_struct *tty, | USB_DIR_IN, 0, /* value: 0 means "remaining room" */ 0, /* index */ - &room, + room, 1, 2000); + if (rc > 0) { + dbg(" roomquery says %d", *room); + priv->tx_room = *room; + } + kfree(room); if (rc < 0) { dbg(" roomquery failed"); goto exit; @@ -563,8 +582,6 @@ static int keyspan_pda_write(struct tty_struct *tty, rc = -EIO; /* device didn't return any data */ goto exit; } - dbg(" roomquery says %d", room); - priv->tx_room = room; } if (count > priv->tx_room) { /* we're about to completely fill the Tx buffer, so @@ -684,18 +701,22 @@ static int keyspan_pda_open(struct tty_struct *tty, struct usb_serial_port *port) { struct usb_serial *serial = port->serial; - unsigned char room; + u8 *room; int rc = 0; struct keyspan_pda_private *priv; /* find out how much room is in the Tx ring */ + room = kmalloc(1, GFP_KERNEL); + if (!room) + return -ENOMEM; + rc = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0), 6, /* write_room */ USB_TYPE_VENDOR | USB_RECIP_INTERFACE | USB_DIR_IN, 0, /* value */ 0, /* index */ - &room, + room, 1, 2000); if (rc < 0) { @@ -708,8 +729,8 @@ static int keyspan_pda_open(struct tty_struct *tty, goto error; } priv = usb_get_serial_port_data(port); - priv->tx_room = room; - priv->tx_throttled = room ? 0 : 1; + priv->tx_room = *room; + priv->tx_throttled = *room ? 0 : 1; /*Start reading from the device*/ port->interrupt_in_urb->dev = serial->dev; @@ -718,8 +739,8 @@ static int keyspan_pda_open(struct tty_struct *tty, dbg("%s - usb_submit_urb(read int) failed", __func__); goto error; } - error: + kfree(room); return rc; } static void keyspan_pda_close(struct usb_serial_port *port) -- 1.6.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/