[PATCH] USB: legousbtower: fix a signedness bug in tower_probe()

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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@xxxxxxxxxx>
---
 drivers/usb/misc/legousbtower.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 9d4c52a7ebe0..835908fe1e65 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -881,7 +881,7 @@ 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 < 0 || result < sizeof(*get_version_reply)) {
 		if (result >= 0)
 			result = -EIO;
 		dev_err(idev, "get version request failed: %d\n", result);
-- 
2.20.1




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