linux-kernel - Re: [PATCH] fix inverted test in __skb_recv

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Message-ID: <87h9jt809v.fsf@doppelsaurus.mobileactivedefense.com>
Date:	Tue, 08 Dec 2015 14:47:56 +0000
From:	Rainer Weikusat <rweikusat@...ileactivedefense.com>
To:	David Miller <davem@...emloft.net>
Cc:	rweikusat@...ileactivedefense.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix inverted test in __skb_recv_datagram

As the kernel generally uses negated error numbers, *err needs to be
compared with -EAGAIN (d'oh).

Signed-off-by: Rainer Weikusat <rweikusat@...ileactivedefense.com>
Fixes: ea3793ee29d3 ("core: enable more fine-grained datagram reception control")
---
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 7daff66..fa9dc64 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -275,7 +275,7 @@ struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned int flags,
 		if (skb)
 			return skb;
 
-		if (*err != EAGAIN)
+		if (*err != -EAGAIN)
 			break;
 	} while (timeo &&
 		!__skb_wait_for_more_packets(sk, err, &timeo, last));
--
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