mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 18:19:02 +00:00
49 lines
1.9 KiB
Diff
49 lines
1.9 KiB
Diff
From e75dc677ff8d06ffa61bef6fee436227ae5440c6 Mon Sep 17 00:00:00 2001
|
|
From: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
|
|
Date: Wed, 21 Aug 2013 01:43:19 -0700
|
|
Subject: [PATCH 2/2] hso: Fix stack corruption on some architectures
|
|
|
|
As Sergei Shtylyov explained in the #mipslinux IRC channel:
|
|
[Mon 2013-08-19 12:28:21 PM PDT] <headless> guys, are you sure it's not "DMA off stack" case?
|
|
[Mon 2013-08-19 12:28:35 PM PDT] <headless> it's a known stack corruptor on non-coherent arches
|
|
[Mon 2013-08-19 12:31:48 PM PDT] <DonkeyHotei> headless: for usb/ehci?
|
|
[Mon 2013-08-19 12:34:11 PM PDT] <DonkeyHotei> headless: explain
|
|
[Mon 2013-08-19 12:35:38 PM PDT] <headless> usb_control_msg() (or other such func) should not use buffer on stack. DMA from/to stack is prohibited
|
|
[Mon 2013-08-19 12:35:58 PM PDT] <headless> and EHCI uses DMA on control xfers (as well as all the others)
|
|
|
|
Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
|
|
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
Signed-off-by: David S. Miller <davem@davemloft.net>
|
|
---
|
|
drivers/net/usb/hso.c | 6 +++++-
|
|
1 file changed, 5 insertions(+), 1 deletion(-)
|
|
|
|
--- a/drivers/net/usb/hso.c
|
|
+++ b/drivers/net/usb/hso.c
|
|
@@ -2825,13 +2825,16 @@ exit:
|
|
static int hso_get_config_data(struct usb_interface *interface)
|
|
{
|
|
struct usb_device *usbdev = interface_to_usbdev(interface);
|
|
- u8 config_data[17];
|
|
+ u8 *config_data = kmalloc(17, GFP_KERNEL);
|
|
u32 if_num = interface->altsetting->desc.bInterfaceNumber;
|
|
s32 result;
|
|
|
|
+ if (!config_data)
|
|
+ return -ENOMEM;
|
|
if (usb_control_msg(usbdev, usb_rcvctrlpipe(usbdev, 0),
|
|
0x86, 0xC0, 0, 0, config_data, 17,
|
|
USB_CTRL_SET_TIMEOUT) != 0x11) {
|
|
+ kfree(config_data);
|
|
return -EIO;
|
|
}
|
|
|
|
@@ -2882,6 +2885,7 @@ static int hso_get_config_data(struct us
|
|
if (config_data[16] & 0x1)
|
|
result |= HSO_INFO_CRC_BUG;
|
|
|
|
+ kfree(config_data);
|
|
return result;
|
|
}
|
|
|