linux-kernel - [PATCH 4.4 19/46] tipc: use only positive error codes in messages

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Date:   Thu, 19 Oct 2017 15:48:55 +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,
        Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@...csson.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 19/46] tipc: use only positive error codes in messages

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

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

From: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@...csson.com>

[ Upstream commit aad06212d36cf34859428a0a279e5c14ee5c9e26 ]

In commit e3a77561e7d32 ("tipc: split up function tipc_msg_eval()"),
we have updated the function tipc_msg_lookup_dest() to set the error
codes to negative values at destination lookup failures. Thus when
the function sets the error code to -TIPC_ERR_NO_NAME, its inserted
into the 4 bit error field of the message header as 0xf instead of
TIPC_ERR_NO_NAME (1). The value 0xf is an unknown error code.

In this commit, we set only positive error code.

Fixes: e3a77561e7d32 ("tipc: split up function tipc_msg_eval()")
Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@...csson.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/tipc/msg.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -541,7 +541,7 @@ bool tipc_msg_lookup_dest(struct net *ne
 		return false;
 	if (msg_errcode(msg))
 		return false;
-	*err = -TIPC_ERR_NO_NAME;
+	*err = TIPC_ERR_NO_NAME;
 	if (skb_linearize(skb))
 		return false;
 	msg = buf_msg(skb);