linux-kernel - [PATCH 4.9 31/49] staging: wlan-ng: fix exit return when sme->key_idx >= NUM

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Message-Id: <20191027203145.580889658@linuxfoundation.org>
Date:   Sun, 27 Oct 2019 22:01:09 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Colin Ian King <colin.king@...onical.com>
Subject: [PATCH 4.9 31/49] staging: wlan-ng: fix exit return when sme->key_idx >= NUM_WEPKEYS

From: Colin Ian King <colin.king@...onical.com>

commit 153c5d8191c26165dbbd2646448ca7207f7796d0 upstream.

Currently the exit return path when sme->key_idx >= NUM_WEPKEYS is via
label 'exit' and this checks if result is non-zero, however result has
not been initialized and contains garbage.  Fix this by replacing the
goto with a return with the error code.

Addresses-Coverity: ("Uninitialized scalar variable")
Fixes: 0ca6d8e74489 ("Staging: wlan-ng: replace switch-case statements with macro")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
Cc: stable <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/20191014110201.9874-1-colin.king@canonical.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/wlan-ng/cfg80211.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/staging/wlan-ng/cfg80211.c
+++ b/drivers/staging/wlan-ng/cfg80211.c
@@ -489,10 +489,8 @@ static int prism2_connect(struct wiphy *
 	/* Set the encryption - we only support wep */
 	if (is_wep) {
 		if (sme->key) {
-			if (sme->key_idx >= NUM_WEPKEYS) {
-				err = -EINVAL;
-				goto exit;
-			}
+			if (sme->key_idx >= NUM_WEPKEYS)
+				return -EINVAL;
 
 			result = prism2_domibset_uint32(wlandev,
 				DIDmib_dot11smt_dot11PrivacyTable_dot11WEPDefaultKeyID,