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 3.14-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-3.14 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-3.14/media-stk1160-avoid-stack-allocated-buffer-for-control-urbs.patch
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