linux-kernel - [PATCH v2] staging: rtl8192e: remove bogus ssid character sign test

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Message-Id: <20221025122150.583617-1-Jason@zx2c4.com>
Date:   Tue, 25 Oct 2022 14:21:50 +0200
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev,
        dan.carpenter@...cle.com, gregkh@...uxfoundation.org,
        kvalo@...nel.org, linux-wireless@...r.kernel.org
Cc:     "Jason A. Donenfeld" <Jason@...c4.com>
Subject: [PATCH v2] staging: rtl8192e: remove bogus ssid character sign test

This error triggers on some architectures with unsigned `char` types:

drivers/staging/rtl8192e/rtllib_softmac_wx.c:459 rtllib_wx_set_essid() warn: impossible condition '(extra[i] < 0) => (0-255 < 0)'

But actually, the entire test is bogus, as ssids don't have any sign
validity rules like that. So just remove this check look all together.

Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-staging@...ts.linux.dev
Signed-off-by: Jason A. Donenfeld <Jason@...c4.com>
---
Changes v1->v2:
- Remove ssid sign test entirely rather than casting to `s8 *`.

 drivers/staging/rtl8192e/rtllib_softmac_wx.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/staging/rtl8192e/rtllib_softmac_wx.c b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
index f9589c5b62ba..1e5ad3b476ef 100644
--- a/drivers/staging/rtl8192e/rtllib_softmac_wx.c
+++ b/drivers/staging/rtl8192e/rtllib_softmac_wx.c
@@ -439,7 +439,7 @@ int rtllib_wx_set_essid(struct rtllib_device *ieee,
 			union iwreq_data *wrqu, char *extra)
 {
 
-	int ret = 0, len, i;
+	int ret = 0, len;
 	short proto_started;
 	unsigned long flags;
 
@@ -455,13 +455,6 @@ int rtllib_wx_set_essid(struct rtllib_device *ieee,
 		goto out;
 	}
 
-	for (i = 0; i < len; i++) {
-		if (extra[i] < 0) {
-			ret = -1;
-			goto out;
-		}
-	}
-
 	if (proto_started)
 		rtllib_stop_protocol(ieee, true);
 
-- 
2.38.1