~sircmpwn/linux

88f6bf3846ee90bf33aa1ce848cd3bfb3229f4a4 — Johan Hovold 1 year, 8 days ago d98ee2a
USB: ldusb: use unsigned size format specifiers

A recent info-leak bug manifested itself along with warning about a
negative buffer overflow:

	ldusb 1-1:0.28: Read buffer overflow, -131383859965943 bytes dropped

when it was really a rather large positive one.

A sanity check that prevents this has now been put in place, but let's
fix up the size format specifiers, which should all be unsigned.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191022143203.5260-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1 files changed, 4 insertions(+), 3 deletions(-)

M drivers/usb/misc/ldusb.c
M drivers/usb/misc/ldusb.c => drivers/usb/misc/ldusb.c +4 -3
@@ 487,7 487,7 @@ static ssize_t ld_usb_read(struct file *file, char __user *buffer, size_t count,
	}
	bytes_to_read = min(count, *actual_buffer);
	if (bytes_to_read < *actual_buffer)
		dev_warn(&dev->intf->dev, "Read buffer overflow, %zd bytes dropped\n",
		dev_warn(&dev->intf->dev, "Read buffer overflow, %zu bytes dropped\n",
			 *actual_buffer-bytes_to_read);

	/* copy one interrupt_in_buffer from ring_buffer into userspace */


@@ 562,8 562,9 @@ static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
	/* write the data into interrupt_out_buffer from userspace */
	bytes_to_write = min(count, write_buffer_size*dev->interrupt_out_endpoint_size);
	if (bytes_to_write < count)
		dev_warn(&dev->intf->dev, "Write buffer overflow, %zd bytes dropped\n", count-bytes_to_write);
	dev_dbg(&dev->intf->dev, "%s: count = %zd, bytes_to_write = %zd\n",
		dev_warn(&dev->intf->dev, "Write buffer overflow, %zu bytes dropped\n",
			count - bytes_to_write);
	dev_dbg(&dev->intf->dev, "%s: count = %zu, bytes_to_write = %zu\n",
		__func__, count, bytes_to_write);

	if (copy_from_user(dev->interrupt_out_buffer, buffer, bytes_to_write)) {