linux-kernel - [PATCH v2] staging: rtl8712: fix wrong function output

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Message-ID: <20210409124611.GA3981@test-VirtualBox>
Date:   Fri, 9 Apr 2021 14:46:11 +0200
From:   Sergei Krainov <sergei.krainov.lkd@...il.com>
To:     Larry.Finger@...inger.net, florian.c.schilhabel@...glemail.com,
        gregkh@...uxfoundation.org
Cc:     linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v2] staging: rtl8712: fix wrong function output

Return NULL from r8712_find_network() if no matched wlan_network
was found. Code with a bug:

while (plist != phead) {
	pnetwork = container_of(plist, struct wlan_network, list);
	plist = plist->next;
	if (!memcmp(addr, pnetwork->network.MacAddress, ETH_ALEN))
		break;
}
spin_unlock_irqrestore(&scanned_queue->lock, irqL);
return pnetwork;

In this code last processed pnetwork returned if list end was reached
and no pnetwork matched test condition.

Signed-off-by: Sergei Krainov <sergei.krainov.lkd@...il.com>
---
Changes from v1: Updated description

 drivers/staging/rtl8712/rtl871x_mlme.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/rtl8712/rtl871x_mlme.c b/drivers/staging/rtl8712/rtl871x_mlme.c
index 8a97307fbbd6..c38161114b80 100644
--- a/drivers/staging/rtl8712/rtl871x_mlme.c
+++ b/drivers/staging/rtl8712/rtl871x_mlme.c
@@ -146,6 +146,8 @@ static struct wlan_network *r8712_find_network(struct  __queue *scanned_queue,
 		if (!memcmp(addr, pnetwork->network.MacAddress, ETH_ALEN))
 			break;
 	}
+	if (plist == phead)
+		pnetwork = NULL;
 	spin_unlock_irqrestore(&scanned_queue->lock, irqL);
 	return pnetwork;
 }
-- 
2.25.1