Patch "media: dvb: i2c transfers over usb cannot be done from stack" has been added to the 4.4-stable tree

Patch "media: dvb: i2c transfers over usb cannot be done from stack" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    media: dvb: i2c transfers over usb cannot be done from stack

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-dvb-i2c-transfers-over-usb-cannot-be-done-from-stack.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 6d33377f2abbf9f0e561b116dd468d1c3ff36a6a Mon Sep 17 00:00:00 2001
From: Laurent Caumont <lcaumont2@gmail.com>
Date: Sat, 11 Nov 2017 12:44:46 -0500
Subject: media: dvb: i2c transfers over usb cannot be done from stack

From: Laurent Caumont <lcaumont2@gmail.com>

commit 6d33377f2abbf9f0e561b116dd468d1c3ff36a6a upstream.

Signed-off-by: Laurent Caumont <lcaumont2@gmail.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/media/usb/dvb-usb/dibusb-common.c |   16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

--- a/drivers/media/usb/dvb-usb/dibusb-common.c
+++ b/drivers/media/usb/dvb-usb/dibusb-common.c
@@ -179,8 +179,20 @@ EXPORT_SYMBOL(dibusb_i2c_algo);
 
 int dibusb_read_eeprom_byte(struct dvb_usb_device *d, u8 offs, u8 *val)
 {
-	u8 wbuf[1] = { offs };
-	return dibusb_i2c_msg(d, 0x50, wbuf, 1, val, 1);
+	u8 *buf;
+	int rc;
+
+	buf = kmalloc(2, GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
+
+	buf[0] = offs;
+
+	rc = dibusb_i2c_msg(d, 0x50, &buf[0], 1, &buf[1], 1);
+	*val = buf[1];
+	kfree(buf);
+
+	return rc;
 }
 EXPORT_SYMBOL(dibusb_read_eeprom_byte);
 


Patches currently in stable-queue which might be from lcaumont2@gmail.com are

queue-4.4/media-dvb-i2c-transfers-over-usb-cannot-be-done-from-stack.patch