linux-kernel - [PATCH AUTOSEL 4.14 3/4] usb/usbip: Fix v_recv_cmd_submit() to use PIPE

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Message-Id: <20221224013315.393820-3-sashal@kernel.org>
Date:   Fri, 23 Dec 2022 20:33:14 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <sashal@...nel.org>, valentina.manea.m@...il.com,
        shuah@...nel.org, linux-usb@...r.kernel.org
Subject: [PATCH AUTOSEL 4.14 3/4] usb/usbip: Fix v_recv_cmd_submit() to use PIPE_BULK define

From: Shuah Khan <skhan@...uxfoundation.org>

[ Upstream commit dd65a243a915ca319ed5fee9161a168c836fa2f2 ]

Fix v_recv_cmd_submit() to use PIPE_BULK define instead of hard coded
values. This also fixes the following signed integer overflow error
reported by cppcheck. This is not an issue since pipe is unsigned int.
However, this change improves the code to use proper define.

drivers/usb/usbip/vudc_rx.c:152:26: error: Signed integer overflow for expression '3<<30'. [integerOverflow]
 urb_p->urb->pipe &= ~(3 << 30);

In addition, add a build time check for PIPE_BULK != 3 as the code path
depends on PIPE_BULK = 3.

Signed-off-by: Shuah Khan <skhan@...uxfoundation.org>
Link: https://lore.kernel.org/r/20221110194738.38514-1-skhan@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/usb/usbip/vudc_rx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/usbip/vudc_rx.c b/drivers/usb/usbip/vudc_rx.c
index d020e72b3122..7c5d09ee3ef8 100644
--- a/drivers/usb/usbip/vudc_rx.c
+++ b/drivers/usb/usbip/vudc_rx.c
@@ -161,7 +161,9 @@ static int v_recv_cmd_submit(struct vudc *udc,
 	urb_p->urb->status = -EINPROGRESS;
 
 	/* FIXME: more pipe setup to please usbip_common */
-	urb_p->urb->pipe &= ~(3 << 30);
+	BUILD_BUG_ON_MSG(PIPE_BULK != 3, "PIPE_* doesn't range from 0 to 3");
+
+	urb_p->urb->pipe &= ~(PIPE_BULK << 30);
 	switch (urb_p->ep->type) {
 	case USB_ENDPOINT_XFER_BULK:
 		urb_p->urb->pipe |= (PIPE_BULK << 30);
-- 
2.35.1