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Subject[PATCH 4.19 41/41] tipc: use destination length for copy string
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4.19-stable review patch.  If anyone has any objections, please let me know.

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

From: Guoqing Jiang <gqjiang@suse.com>

commit 29e270fc32192e7729057963ae7120663856c93e upstream.

Got below warning with gcc 8.2 compiler.

net/tipc/topsrv.c: In function ‘tipc_topsrv_start’:
net/tipc/topsrv.c:660:2: warning: ‘strncpy’ specified bound depends on the length of the source argument [-Wstringop-overflow=]
strncpy(srv->name, name, strlen(name) + 1);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
net/tipc/topsrv.c:660:27: note: length computed here
strncpy(srv->name, name, strlen(name) + 1);
^~~~~~~~~~~~
So change it to correct length and use strscpy.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/tipc/topsrv.c b/net/tipc/topsrv.c
index d8956f7daac4..4bdea0057171 100644
--- a/net/tipc/topsrv.c
+++ b/net/tipc/topsrv.c
@@ -651,7 +651,7 @@ int tipc_topsrv_start(struct net *net)
srv->max_rcvbuf_size = sizeof(struct tipc_subscr);
INIT_WORK(&srv->awork, tipc_topsrv_accept);

- strncpy(srv->name, name, strlen(name) + 1);
+ strscpy(srv->name, name, sizeof(srv->name));
tn->topsrv = srv;
atomic_set(&tn->subscription_count, 0);


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