From 6d317482944250228255bcbe97a95b7e7ad9a538 Mon Sep 17 00:00:00 2001 From: Christian Eggers Date: Wed, 21 Jan 2009 12:56:24 -0800 Subject: [PATCH] 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 Acked-by: Arnd Bergmann Signed-off-by: David S. Miller --- drivers/net/usb/mcs7830.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/drivers/net/usb/mcs7830.c b/drivers/net/usb/mcs7830.c index 5385d66b306e..ced8f36ebd01 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; } -- 2.30.2