tipc: use only positive error codes in messages

[ 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@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index 8740930f07872ff1ec8ff9d6b712b2772ba48336..67bddcb2ff4662dbb77fdf54f2a4366a7ce7bd3c 100644 (file)
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -541,7 +541,7 @@ bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb, int *err)
                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);