linux-kernel - [PATCH next] ca8210: Fix unsigned mac_len comparison with zero in ca8210_skb

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Message-Id: <20230306191824.4115839-1-harshit.m.mogalapalli@oracle.com>
Date:   Mon,  6 Mar 2023 11:18:24 -0800
From:   Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     error27@...il.com,
        Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>,
        Alexander Aring <alex.aring@...il.com>,
        Stefan Schmidt <stefan@...enfreihafen.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Marcel Holtmann <marcel@...tmann.org>,
        Harry Morris <harrymorris12@...il.com>,
        linux-wpan@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH next] ca8210: Fix unsigned mac_len comparison with zero in ca8210_skb_tx()

mac_len is of type unsigned, which can never be less than zero.

	mac_len = ieee802154_hdr_peek_addrs(skb, &header);
	if (mac_len < 0)
		return mac_len;

Change this to type int as ieee802154_hdr_peek_addrs() can return negative
integers, this is found by static analysis with smatch.

Fixes: ded845a781a5 ("ieee802154: Add CA8210 IEEE 802.15.4 device driver")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@...cle.com>
---
Only compile tested.
---
 drivers/net/ieee802154/ca8210.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index 0b0c6c0764fe..d0b5129439ed 100644
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -1902,10 +1902,9 @@ static int ca8210_skb_tx(
 	struct ca8210_priv  *priv
 )
 {
-	int status;
 	struct ieee802154_hdr header = { };
 	struct secspec secspec;
-	unsigned int mac_len;
+	int mac_len, status;
 
 	dev_dbg(&priv->spi->dev, "%s called\n", __func__);
 
-- 
2.38.1