Allocate buffers on HEAP instead of STACK for local structures
that are to be received using usb_control_msg().
Signed-off-by: Maksim Salau <maksim.sa...@gmail.com>
Tested-by: Alfredo Rafael Vicente Boix <alvi...@gmail.com>
Cc: sta...@vger.kernel.org
---
Changes in v2:
* made checkpatch happy with the format string passed to dev_info
in tower_probe() (merged two parts into a single string literal);
* changed commit message to better reflect location of the module;
was: USB: legousbtower: Fix buffers on stack;
* added Tested-by: Alfredo Rafael Vicente Boix <alvi...@gmail.com>
and Cc: sta...@vger.kernel.org
drivers/usb/misc/legousbtower.c | 37 +++++++++++++++++++++++++++----------
1 file changed, 27 insertions(+), 10 deletions(-)
diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index b10e26c..ed1999e 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -317,9 +317,16 @@ static int tower_open (struct inode *inode, struct file
*file)
int subminor;
int retval = 0;
struct usb_interface *interface;
- struct tower_reset_reply reset_reply;
+ struct tower_reset_reply *reset_reply = NULL;
int result;
+ reset_reply = kmalloc(sizeof(*reset_reply), GFP_KERNEL);
+
+ if (!reset_reply) {
+ retval = -ENOMEM;
+ goto exit;
+ }
+
nonseekable_open(inode, file);
subminor = iminor(inode);
@@ -364,8 +371,8 @@ static int tower_open (struct inode *inode, struct file
*file)
USB_TYPE_VENDOR | USB_DIR_IN |
USB_RECIP_DEVICE,
0,
0,
- &reset_reply,
- sizeof(reset_reply),
+ reset_reply,
+ sizeof(*reset_reply),
1000);
if (result < 0) {
dev_err(&dev->udev->dev,
@@ -406,6 +413,7 @@ static int tower_open (struct inode *inode, struct file
*file)
mutex_unlock(&dev->lock);
exit:
+ kfree(reset_reply);
return retval;
}
@@ -808,7 +816,7 @@ static int tower_probe (struct usb_interface *interface,
const struct usb_device
struct lego_usb_tower *dev = NULL;
struct usb_host_interface *iface_desc;
struct usb_endpoint_descriptor* endpoint;
- struct tower_get_version_reply get_version_reply;
+ struct tower_get_version_reply *get_version_reply = NULL;
int i;
int retval = -ENOMEM;
int result;
@@ -886,6 +894,13 @@ static int tower_probe (struct usb_interface *interface,
const struct usb_device
dev->interrupt_in_interval = interrupt_in_interval ?
interrupt_in_interval : dev->interrupt_in_endpoint->bInterval;
dev->interrupt_out_interval = interrupt_out_interval ?
interrupt_out_interval : dev->interrupt_out_endpoint->bInterval;
+ get_version_reply = kmalloc(sizeof(*get_version_reply), GFP_KERNEL);
+
+ if (!get_version_reply) {
+ retval = -ENOMEM;
+ goto error;
+ }
+
/* get the firmware version and log it */
result = usb_control_msg (udev,
usb_rcvctrlpipe(udev, 0),
@@ -893,18 +908,19 @@ static int tower_probe (struct usb_interface *interface,
const struct usb_device
USB_TYPE_VENDOR | USB_DIR_IN |
USB_RECIP_DEVICE,
0,
0,
- &get_version_reply,
- sizeof(get_version_reply),
+ get_version_reply,
+ sizeof(*get_version_reply),
1000);
if (result < 0) {
dev_err(idev, "LEGO USB Tower get version control request
failed\n");
retval = result;
goto error;
}
- dev_info(&interface->dev, "LEGO USB Tower firmware version is %d.%d "
- "build %d\n", get_version_reply.major,
- get_version_reply.minor,
- le16_to_cpu(get_version_reply.build_no));
+ dev_info(&interface->dev,
+ "LEGO USB Tower firmware version is %d.%d build %d\n",
+ get_version_reply->major,
+ get_version_reply->minor,
+ le16_to_cpu(get_version_reply->build_no));
/* we can register the device now, as it is ready */
usb_set_intfdata (interface, dev);
@@ -928,6 +944,7 @@ static int tower_probe (struct usb_interface *interface,
const struct usb_device
return retval;
error:
+ kfree(get_version_reply);
tower_delete(dev);
return retval;
}
--
2.9.3
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