linux-kernel - [PATCH 4.19 071/120] USB: gadget: u_ether: Fix a configfs return code

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Message-Id: <20210315135722.306884259@linuxfoundation.org>
Date:   Mon, 15 Mar 2021 14:57:02 +0100
From:   gregkh@...uxfoundation.org
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lorenzo Colitti <lorenzo@...gle.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH 4.19 071/120] USB: gadget: u_ether: Fix a configfs return code

From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

commit 650bf52208d804ad5ee449c58102f8dc43175573 upstream.

If the string is invalid, this should return -EINVAL instead of 0.

Fixes: 73517cf49bd4 ("usb: gadget: add RNDIS configfs options for class/subclass/protocol")
Cc: stable <stable@...r.kernel.org>
Acked-by: Lorenzo Colitti <lorenzo@...gle.com>
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Link: https://lore.kernel.org/r/YCqZ3P53yyIg5cn7@mwanda
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/gadget/function/u_ether_configfs.h |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/usb/gadget/function/u_ether_configfs.h
+++ b/drivers/usb/gadget/function/u_ether_configfs.h
@@ -169,12 +169,11 @@ out:									\
 						size_t len)		\
 	{								\
 		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
-		int ret;						\
+		int ret = -EINVAL;					\
 		u8 val;							\
 									\
 		mutex_lock(&opts->lock);				\
-		ret = sscanf(page, "%02hhx", &val);			\
-		if (ret > 0) {						\
+		if (sscanf(page, "%02hhx", &val) > 0) {			\
 			opts->_n_ = val;				\
 			ret = len;					\
 		}							\