linux-kernel - [PATCH 3.16] staging: usbip stub_rx fix static checker warning on unnecessary checks

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Date:   Mon, 26 Feb 2018 14:12:41 -0700
From:   Shuah Khan <shuahkh@....samsung.com>
To:     valentina.manea.m@...il.com, shuah@...nel.org,
        gregkh@...uxfoundation.org
Cc:     Shuah Khan <shuahkh@....samsung.com>, devel@...verdev.osuosl.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, bwh@...nel.org, dan.carpenter@...cle.com
Subject: [PATCH 3.16] staging: usbip stub_rx fix static checker warning on unnecessary checks

Upstream commit 10c901209306
("usbip: stub_rx: fix static checker warning on unnecessary checks")

Back-port fix for static checker warning on unnecessary checks

smatch warnings:
drivers/staging/usbip/stub_rx.c:360 get_pipe() warn: impossible
condition '(pdu->u.cmd_submit.transfer_buffer_length > ((~0 >> 1))) =>
(s32min-s32max > s32max)'
drivers/staging/usbip/stub_rx.c:501 stub_recv_cmd_submit() warn: always
true condition '(pdu->u.cmd_submit.transfer_buffer_length <= ((~0 >>
1))) => (s32min-s32max <= s32max)'

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
---
 drivers/staging/usbip/stub_rx.c | 11 +----------
 1 file changed, 1 insertion(+), 10 deletions(-)

diff --git a/drivers/staging/usbip/stub_rx.c b/drivers/staging/usbip/stub_rx.c
index 35f59747122a..d8544ab9577b 100644
--- a/drivers/staging/usbip/stub_rx.c
+++ b/drivers/staging/usbip/stub_rx.c
@@ -356,14 +356,6 @@ static int get_pipe(struct stub_device *sdev, struct usbip_header *pdu)
 
 	epd = &ep->desc;
 
-	/* validate transfer_buffer_length */
-	if (pdu->u.cmd_submit.transfer_buffer_length > INT_MAX) {
-		dev_err(&sdev->udev->dev,
-			"CMD_SUBMIT: -EMSGSIZE transfer_buffer_length %d\n",
-			pdu->u.cmd_submit.transfer_buffer_length);
-		return -1;
-	}
-
 	if (usb_endpoint_xfer_control(epd)) {
 		if (dir == USBIP_DIR_OUT)
 			return usb_sndctrlpipe(udev, epnum);
@@ -497,8 +489,7 @@ static void stub_recv_cmd_submit(struct stub_device *sdev,
 	}
 
 	/* allocate urb transfer buffer, if needed */
-	if (pdu->u.cmd_submit.transfer_buffer_length > 0 &&
-	    pdu->u.cmd_submit.transfer_buffer_length <= INT_MAX) {
+	if (pdu->u.cmd_submit.transfer_buffer_length > 0) {
 		priv->urb->transfer_buffer =
 			kzalloc(pdu->u.cmd_submit.transfer_buffer_length,
 				GFP_KERNEL);
-- 
2.14.1