Patch "media: stk1160: Avoid stack-allocated buffer for control URBs" has been added to the 3.10-stable tree

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

    media: stk1160: Avoid stack-allocated buffer for control URBs

to the 3.10-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-stk1160-avoid-stack-allocated-buffer-for-control-urbs.patch
and it can be found in the queue-3.10 subdirectory.

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


>From 85ac1a1772bb41da895bad83a81f6a62c8f293f6 Mon Sep 17 00:00:00 2001
From: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
Date: Thu, 17 Apr 2014 09:28:20 -0300
Subject: media: stk1160: Avoid stack-allocated buffer for control URBs

From: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>

commit 85ac1a1772bb41da895bad83a81f6a62c8f293f6 upstream.

Currently stk1160_read_reg() uses a stack-allocated char to get the
read control value. This is wrong because usb_control_msg() requires
a kmalloc-ed buffer.

This commit fixes such issue by kmalloc'ating a 1-byte buffer to receive
the read value.

While here, let's remove the urb_buf array which was meant for a similar
purpose, but never really used.

Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Reported-by: Sander Eikelenboom <linux@xxxxxxxxxxxxxx>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/media/usb/stk1160/stk1160-core.c |   10 +++++++++-
 drivers/media/usb/stk1160/stk1160.h      |    1 -
 2 files changed, 9 insertions(+), 2 deletions(-)

--- a/drivers/media/usb/stk1160/stk1160-core.c
+++ b/drivers/media/usb/stk1160/stk1160-core.c
@@ -67,17 +67,25 @@ int stk1160_read_reg(struct stk1160 *dev
 {
 	int ret;
 	int pipe = usb_rcvctrlpipe(dev->udev, 0);
+	u8 *buf;
 
 	*value = 0;
+
+	buf = kmalloc(sizeof(u8), GFP_KERNEL);
+	if (!buf)
+		return -ENOMEM;
 	ret = usb_control_msg(dev->udev, pipe, 0x00,
 			USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-			0x00, reg, value, sizeof(u8), HZ);
+			0x00, reg, buf, sizeof(u8), HZ);
 	if (ret < 0) {
 		stk1160_err("read failed on reg 0x%x (%d)\n",
 			reg, ret);
+		kfree(buf);
 		return ret;
 	}
 
+	*value = *buf;
+	kfree(buf);
 	return 0;
 }
 
--- a/drivers/media/usb/stk1160/stk1160.h
+++ b/drivers/media/usb/stk1160/stk1160.h
@@ -143,7 +143,6 @@ struct stk1160 {
 	int num_alt;
 
 	struct stk1160_isoc_ctl isoc_ctl;
-	char urb_buf[255];	 /* urb control msg buffer */
 
 	/* frame properties */
 	int width;		  /* current frame width */


Patches currently in stable-queue which might be from ezequiel.garcia@xxxxxxxxxxxxxxxxxx are

queue-3.10/media-stk1160-avoid-stack-allocated-buffer-for-control-urbs.patch
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