linux-kernel - [PATCH 4.9 31/62] USB: legousbtower: fix a signedness bug in tower

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Message-Id: <20191104211930.647221425@linuxfoundation.org>
Date:   Mon,  4 Nov 2019 22:44:53 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Johan Hovold <johan@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 31/62] USB: legousbtower: fix a signedness bug in tower_probe()

From: Dan Carpenter <dan.carpenter@...cle.com>

[ 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@...cle.com>
Acked-by: Johan Hovold <johan@...nel.org>
Link: https://lore.kernel.org/r/20191011141115.GA4521@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 f56307059d48c..7cac3ee09b09d 100644
--- 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);
-- 
2.20.1