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authorChristian Eggers <christian.eggers@kathrein.de>2009-01-21 12:56:24 -0800
committerDavid S. Miller <davem@davemloft.net>2009-01-21 12:56:24 -0800
commit6d317482944250228255bcbe97a95b7e7ad9a538 (patch)
tree699fd50b7ff360c0cb0c82cf1f28388d8996d461
parent0b491eee46012772cbf029450d123e933c2e7940 (diff)
downloadop-kernel-dev-6d317482944250228255bcbe97a95b7e7ad9a538.zip
op-kernel-dev-6d317482944250228255bcbe97a95b7e7ad9a538.tar.gz
usb/mcs7830: Don't use buffers from stack for USB transfers
mcs7830_set_reg() and mcs7830_get_reg() are called with buffers from stack which must not be used directly for USB transfers. This causes corruption of the stack particulary on non x86 architectures because DMA may be used for these transfers. Signed-off-by: Christian Eggers <christian.eggers@kathrein.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/usb/mcs7830.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c
index 5385d66..ced8f36e 100644
--- a/drivers/net/usb/mcs7830.c
+++ b/drivers/net/usb/mcs7830.c
@@ -94,10 +94,18 @@ static int mcs7830_get_reg(struct usbnet *dev, u16 index, u16 size, void *data)
{
struct usb_device *xdev = dev->udev;
int ret;
+ void *buffer;
+
+ buffer = kmalloc(size, GFP_NOIO);
+ if (buffer == NULL)
+ return -ENOMEM;
ret = usb_control_msg(xdev, usb_rcvctrlpipe(xdev, 0), MCS7830_RD_BREQ,
- MCS7830_RD_BMREQ, 0x0000, index, data,
+ MCS7830_RD_BMREQ, 0x0000, index, buffer,
size, MCS7830_CTRL_TIMEOUT);
+ memcpy(data, buffer, size);
+ kfree(buffer);
+
return ret;
}
@@ -105,10 +113,18 @@ static int mcs7830_set_reg(struct usbnet *dev, u16 index, u16 size, void *data)
{
struct usb_device *xdev = dev->udev;
int ret;
+ void *buffer;
+
+ buffer = kmalloc(size, GFP_NOIO);
+ if (buffer == NULL)
+ return -ENOMEM;
+
+ memcpy(buffer, data, size);
ret = usb_control_msg(xdev, usb_sndctrlpipe(xdev, 0), MCS7830_WR_BREQ,
- MCS7830_WR_BMREQ, 0x0000, index, data,
+ MCS7830_WR_BMREQ, 0x0000, index, buffer,
size, MCS7830_CTRL_TIMEOUT);
+ kfree(buffer);
return ret;
}
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