linux-kernel - [PATCH 4.9 19/28] skbuff: Fix not waking applications when errors are enqueued

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Message-Id: <20180329175735.582981722@linuxfoundation.org>
Date:   Thu, 29 Mar 2018 20:00:38 +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, "Randy E. Witt" <randy.e.witt@...el.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Vinicius Costa Gomes <vinicius.gomes@...el.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 19/28] skbuff: Fix not waking applications when errors are enqueued

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Vinicius Costa Gomes <vinicius.gomes@...el.com>


[ Upstream commit 6e5d58fdc9bedd0255a8781b258f10bbdc63e975 ]

When errors are enqueued to the error queue via sock_queue_err_skb()
function, it is possible that the waiting application is not notified.

Calling 'sk->sk_data_ready()' would not notify applications that
selected only POLLERR events in poll() (for example).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reported-by: Randy E. Witt <randy.e.witt@...el.com>
Reviewed-by: Eric Dumazet <edumazet@...gle.com>
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/core/skbuff.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3717,7 +3717,7 @@ int sock_queue_err_skb(struct sock *sk,
 
 	skb_queue_tail(&sk->sk_error_queue, skb);
 	if (!sock_flag(sk, SOCK_DEAD))
-		sk->sk_data_ready(sk);
+		sk->sk_error_report(sk);
 	return 0;
 }
 EXPORT_SYMBOL(sock_queue_err_skb);