linux-kernel - [PATCH 4.19 02/95] usb: gadget: r8a66597: fix a loop in set

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Date:   Mon,  4 Oct 2021 14:51:32 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Felipe Balbi <balbi@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 4.19 02/95] usb: gadget: r8a66597: fix a loop in set_feature()

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

commit 17956b53ebff6a490baf580a836cbd3eae94892b upstream.

This loop is supposed to loop until if reads something other than
CS_IDST or until it times out after 30,000 attempts.  But because of
the || vs && bug, it will never time out and instead it will loop a
minimum of 30,000 times.

This bug is quite old but the code is only used in USB_DEVICE_TEST_MODE
so it probably doesn't affect regular usage.

Fixes: 96fe53ef5498 ("usb: gadget: r8a66597-udc: add support for TEST_MODE")
Cc: stable <stable@...r.kernel.org>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
Acked-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/r/20210906094221.GA10957@kili
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/gadget/udc/r8a66597-udc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1250,7 +1250,7 @@ static void set_feature(struct r8a66597
 			do {
 				tmp = r8a66597_read(r8a66597, INTSTS0) & CTSQ;
 				udelay(1);
-			} while (tmp != CS_IDST || timeout-- > 0);
+			} while (tmp != CS_IDST && timeout-- > 0);
 
 			if (tmp == CS_IDST)
 				r8a66597_bset(r8a66597,