linux-kernel - [PATCH 5.2 56/85] mt76: Fix a signedness bug in mt7615_add

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Message-Id: <20190918061235.881763984@linuxfoundation.org>
Date:   Wed, 18 Sep 2019 08:19:14 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Felix Fietkau <nbd@....name>
Subject: [PATCH 5.2 56/85] mt76: Fix a signedness bug in mt7615_add_interface()

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

commit b1571a0e77d8cef14227af293c6dda1464a57270 upstream.

The problem is that "mvif->omac_idx" is a u8 so it can't be negative
and the error handling won't work.  The get_omac_idx() function returns
-1 on error.

Fixes: 04b8e65922f6 ("mt76: add mac80211 driver for MT7615 PCIe-based chipsets")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Felix Fietkau <nbd@....name>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/mediatek/mt76/mt7615/main.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/mt7615/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7615/main.c
@@ -77,11 +77,12 @@ static int mt7615_add_interface(struct i
 		goto out;
 	}
 
-	mvif->omac_idx = get_omac_idx(vif->type, dev->omac_mask);
-	if (mvif->omac_idx < 0) {
+	idx = get_omac_idx(vif->type, dev->omac_mask);
+	if (idx < 0) {
 		ret = -ENOSPC;
 		goto out;
 	}
+	mvif->omac_idx = idx;
 
 	/* TODO: DBDC support. Use band 0 and wmm 0 for now */
 	mvif->band_idx = 0;