linux-kernel - [PATCH 4.4 189/312] ipv4: fix checksum annotation in udp4_csum

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Date:   Fri,  8 May 2020 14:33:00 +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, Cong Wang <xiyou.wangcong@...il.com>,
        Tom Herbert <tom@...bertland.com>,
        Hannes Frederic Sowa <hannes@...essinduktion.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 189/312] ipv4: fix checksum annotation in udp4_csum_init

From: Hannes Frederic Sowa <hannes@...essinduktion.org>

commit b46d9f625b07f843c706c2c7d0210a90ccdf143b upstream.

Reported-by: Cong Wang <xiyou.wangcong@...il.com>
Cc: Cong Wang <xiyou.wangcong@...il.com>
Cc: Tom Herbert <tom@...bertland.com>
Fixes: 4068579e1e098fa ("net: Implmement RFC 6936 (zero RX csums for UDP/IPv6")
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/ipv4/udp.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1754,8 +1754,11 @@ static inline int udp4_csum_init(struct
 		}
 	}
 
-	return skb_checksum_init_zero_check(skb, proto, uh->check,
-					    inet_compute_pseudo);
+	/* Note, we are only interested in != 0 or == 0, thus the
+	 * force to int.
+	 */
+	return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
+							 inet_compute_pseudo);
 }
 
 /*