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| author | Peter Korsgaard <jacmet@sunsite.dk> | 2008-07-14 09:07:32 +0200 |
|---|---|---|
| committer | Jeff Garzik <jgarzik@redhat.com> | 2008-07-30 10:43:49 +0200 |
| commit | 16d78bc255a55d16c0888dde336978d633e80b01 (patch) | |
| tree | 377b96ddf4439e2f3d775124c22576125ca5c4e3 | |
| parent | S2io: fix statistics flush after a MTU change (diff) | |
| download | linux-16d78bc255a55d16c0888dde336978d633e80b01.tar.xz linux-16d78bc255a55d16c0888dde336978d633e80b01.zip | |
dm9601: don't do usb transfers of data on stack
dm_{read,write}() were doing USB transfers of data on stack, which isn't
allowed. Fix it by kmalloc'ing a temporary buffer.
Clean up the error handling for short transfers while we're at it.
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Acked-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
| -rw-r--r-- | drivers/net/usb/dm9601.c | 52 |
1 files changed, 42 insertions, 10 deletions
diff --git a/drivers/net/usb/dm9601.c b/drivers/net/usb/dm9601.c index f7319d326912..78df2be8a728 100644 --- a/drivers/net/usb/dm9601.c +++ b/drivers/net/usb/dm9601.c @@ -55,12 +55,28 @@ static int dm_read(struct usbnet *dev, u8 reg, u16 length, void *data) { + void *buf; + int err = -ENOMEM; + devdbg(dev, "dm_read() reg=0x%02x length=%d", reg, length); - return usb_control_msg(dev->udev, - usb_rcvctrlpipe(dev->udev, 0), - DM_READ_REGS, - USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, - 0, reg, data, length, USB_CTRL_SET_TIMEOUT); + + buf = kmalloc(length, GFP_KERNEL); + if (!buf) + goto out; + + err = usb_control_msg(dev->udev, + usb_rcvctrlpipe(dev->udev, 0), + DM_READ_REGS, + USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + 0, reg, buf, length, USB_CTRL_SET_TIMEOUT); + if (err == length) + memcpy(data, buf, length); + else if (err >= 0) + err = -EINVAL; + kfree(buf); + + out: + return err; } static int dm_read_reg(struct usbnet *dev, u8 reg, u8 *value) @@ -70,12 +86,28 @@ static int dm_read_reg(struct usbnet *dev, u8 reg, u8 *value) static int dm_write(struct usbnet *dev, u8 reg, u16 length, void *data) { + void *buf = NULL; + int err = -ENOMEM; + devdbg(dev, "dm_write() reg=0x%02x, length=%d", reg, length); - return usb_control_msg(dev->udev, - usb_sndctrlpipe(dev->udev, 0), - DM_WRITE_REGS, - USB_DIR_OUT | USB_TYPE_VENDOR |USB_RECIP_DEVICE, - 0, reg, data, length, USB_CTRL_SET_TIMEOUT); + + if (data) { + buf = kmalloc(length, GFP_KERNEL); + if (!buf) + goto out; + memcpy(buf, data, length); + } + + err = usb_control_msg(dev->udev, + usb_sndctrlpipe(dev->udev, 0), + DM_WRITE_REGS, + USB_DIR_OUT | USB_TYPE_VENDOR |USB_RECIP_DEVICE, + 0, reg, buf, length, USB_CTRL_SET_TIMEOUT); + kfree(buf); + if (err >= 0 && err < length) + err = -EINVAL; + out: + return err; } static int dm_write_reg(struct usbnet *dev, u8 reg, u8 value) |