ca8210: Fix unsigned mac_len comparison with zero in ca8210_skb_tx()

[ Upstream commit 748b2f5e82d17480404b3e2895388fc2925f7caf ]

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: 6c993779ea1d ("ca8210: fix mac_len negative array access")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@oracle.com>
Acked-by: Alexander Aring <aahringo@redhat.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Link: https://lore.kernel.org/r/20230306191824.4115839-1-harshit.m.mogalapalli@oracle.com
Signed-off-by: Stefan Schmidt <stefan@datenfreihafen.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ieee802154/ca8210.c b/drivers/net/ieee802154/ca8210.c
index 498a82ab4eaf4dac3d07d4d9f391352bc233f150..fb57e561d3e61da8b11f20f3030bb5c48985cf08 100644 (file)
--- a/drivers/net/ieee802154/ca8210.c
+++ b/drivers/net/ieee802154/ca8210.c
@@ -1944,10 +1944,9 @@ 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__);