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authorStanislaw Gruszka <sgruszka@redhat.com>2013-07-08 10:27:23 +0200
committerGustavo Padovan <gustavo.padovan@collabora.co.uk>2013-07-25 19:52:32 +0100
commit517828a87994f41af6ae5a0f96f0f069f05baa81 (patch)
tree3cbc07678c393b519785623871bb1626df9256cf /drivers/bluetooth/ath3k.c
parent84eb2ae1807dd1467bf6f500fc69ae61f1907b75 (diff)
downloadlinux-517828a87994f41af6ae5a0f96f0f069f05baa81.tar.bz2
Bluetooth: ath3k: don't use stack memory for DMA
Memory allocated by vmalloc (including stack) can not be used for DMA, i.e. data pointer on usb_control_msg() should not point to stack memory. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=977558 Reported-and-tested-by: Andy Lawrence <dr.diesel@gmail.com> Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Diffstat (limited to 'drivers/bluetooth/ath3k.c')
-rw-r--r--drivers/bluetooth/ath3k.c38
1 files changed, 29 insertions, 9 deletions
diff --git a/drivers/bluetooth/ath3k.c b/drivers/bluetooth/ath3k.c
index b22376dee2c0..6f17e4dec441 100644
--- a/drivers/bluetooth/ath3k.c
+++ b/drivers/bluetooth/ath3k.c
@@ -195,24 +195,44 @@ error:
static int ath3k_get_state(struct usb_device *udev, unsigned char *state)
{
- int pipe = 0;
+ int ret, pipe = 0;
+ char *buf;
+
+ buf = kmalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
pipe = usb_rcvctrlpipe(udev, 0);
- return usb_control_msg(udev, pipe, ATH3K_GETSTATE,
- USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
- state, 0x01, USB_CTRL_SET_TIMEOUT);
+ ret = usb_control_msg(udev, pipe, ATH3K_GETSTATE,
+ USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
+ buf, sizeof(*buf), USB_CTRL_SET_TIMEOUT);
+
+ *state = *buf;
+ kfree(buf);
+
+ return ret;
}
static int ath3k_get_version(struct usb_device *udev,
struct ath3k_version *version)
{
- int pipe = 0;
+ int ret, pipe = 0;
+ struct ath3k_version *buf;
+ const int size = sizeof(*buf);
+
+ buf = kmalloc(size, GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
pipe = usb_rcvctrlpipe(udev, 0);
- return usb_control_msg(udev, pipe, ATH3K_GETVERSION,
- USB_TYPE_VENDOR | USB_DIR_IN, 0, 0, version,
- sizeof(struct ath3k_version),
- USB_CTRL_SET_TIMEOUT);
+ ret = usb_control_msg(udev, pipe, ATH3K_GETVERSION,
+ USB_TYPE_VENDOR | USB_DIR_IN, 0, 0,
+ buf, size, USB_CTRL_SET_TIMEOUT);
+
+ memcpy(version, buf, size);
+ kfree(buf);
+
+ return ret;
}
static int ath3k_load_fwfile(struct usb_device *udev,