USB: ldusb: use unsigned size format specifiers

BugLink: https://bugs.launchpad.net/bugs/1853519
[ Upstream commit 88f6bf3846ee90bf33aa1ce848cd3bfb3229f4a4 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index 994e4bff88baa65f5d2a9093ee8fa9c64c68a32c..4dea75d0e6110e97f3c62ad131f5ce5d9392e5d0 100644 (file)
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -486,7 +486,7 @@ 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 */
@@ -561,8 +561,9 @@ 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)) {