linux-kernel - [RE-RESEND PATCH 2/4] usb: musb: Fix NULL check on struct musb

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Message-Id: <20210123142502.16980-2-paul@crapouillou.net>
Date:   Sat, 23 Jan 2021 14:25:00 +0000
From:   Paul Cercueil <paul@...pouillou.net>
To:     Bin Liu <b-liu@...com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Tony Lindgren <tony@...mide.com>, od@...c.me,
        linux-mips@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>,
        Maarten ter Huurne <maarten@...ewalker.org>
Subject: [RE-RESEND PATCH 2/4] usb: musb: Fix NULL check on struct musb_request field

The 'request' variable is a pointer to the 'request' field of the
struct musb_request 'req' pointer. It only worked until now because
the 'request' field is the first one in the musb_request structure, but
as soon as that changes, the check will be invalid.

Fix it preventively by doing the NULL-check on the 'req' pointer
instead.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Suggested-by: Maarten ter Huurne <maarten@...ewalker.org>
Acked-by: Tony Lindgren <tony@...mide.com>
---
 drivers/usb/musb/musb_gadget.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c
index f62ffaede1ab..ef374d4dd94a 100644
--- a/drivers/usb/musb/musb_gadget.c
+++ b/drivers/usb/musb/musb_gadget.c
@@ -451,7 +451,7 @@ void musb_g_tx(struct musb *musb, u8 epnum)
 		return;
 	}
 
-	if (request) {
+	if (req) {
 
 		trace_musb_req_tx(req);
 
-- 
2.29.2