USB: legousbtower: fix a signedness bug in tower_probe()

[ Upstream commit fd47a417e75e2506eb3672ae569b1c87e3774155 ]

The problem is that sizeof() is unsigned long so negative error codes
are type promoted to high positive values and the condition becomes
false.

Fixes: 1d427be4a39d ("USB: legousbtower: fix slab info leak at probe")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Johan Hovold <johan@kernel.org>
Link: https://lore.kernel.org/r/20191011141115.GA4521@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index f56307059d48c5655df732ebd253431c833f33b1..7cac3ee09b09da21e4e70c14a69000499719aaae 100644 (file)
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -898,7 +898,7 @@ static int tower_probe (struct usb_interface *interface, const struct usb_device
                                  get_version_reply,
                                  sizeof(*get_version_reply),
                                  1000);
-       if (result < sizeof(*get_version_reply)) {
+       if (result != sizeof(*get_version_reply)) {
                if (result >= 0)
                        result = -EIO;
                dev_err(idev, "get version request failed: %d\n", result);