tipc: fix link name length check

BugLink: https://bugs.launchpad.net/bugs/1855313

[ Upstream commit fd567ac2 ]

In commit 4f07b80c ("tipc: check msg->req data len in
tipc_nl_compat_bearer_disable") the same patch code was copied into
routines: tipc_nl_compat_bearer_disable(),
tipc_nl_compat_link_stat_dump() and tipc_nl_compat_link_reset_stats().
The two link routine occurrences should have been modified to check
the maximum link name length and not bearer name length.

Fixes: 4f07b80c ("tipc: check msg->reg data len in tipc_nl_compat_bearer_disable")
Signed-off-by: John Rutherford <john.rutherford@dektech.com.au>
Acked-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Connor Kuehl <connor.kuehl@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>

net/tipc/netlink_compat.c

@@ -516,7 +516,7 @@ static int tipc_nl_compat_link_stat_dump(struct tipc_nl_compat_msg *msg,
 	if (len <= 0)
 		return -EINVAL;
 
-	len = min_t(int, len, TIPC_MAX_BEARER_NAME);
+	len = min_t(int, len, TIPC_MAX_LINK_NAME);
 	if (!string_is_valid(name, len))
 		return -EINVAL;
 
@@ -791,7 +791,7 @@ static int tipc_nl_compat_link_reset_stats(struct tipc_nl_compat_cmd_doit *cmd,
 	if (len <= 0)
 		return -EINVAL;
 
-	len = min_t(int, len, TIPC_MAX_BEARER_NAME);
+	len = min_t(int, len, TIPC_MAX_LINK_NAME);
 	if (!string_is_valid(name, len))
 		return -EINVAL;