[IPVS]: Make sure ip_vs_ftp ports are valid

I'm not entirely sure what happens in the case of a valid port,
at best it'll be silently ignored. This patch ignores them a little
more verbosely.

Signed-Off-By: Simon Horman <horms@verge.net.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 6 insertions, 0 deletions

diff --git a/net/ipv4/ipvs/ip_vs_ftp.c b/net/ipv4/ipvs/ip_vs_ftp.c
index 347a66c05569..f0c553c038de 100644
--- a/net/ipv4/ipvs/ip_vs_ftp.c
+++ b/net/ipv4/ipvs/ip_vs_ftp.c
@@ -373,6 +373,12 @@ static int __init ip_vs_ftp_init(void)
         for (i=0; i<IP_VS_APP_MAX_PORTS; i++) {
                 if (!ports[i])
                         continue;
+                if (ports[i] < 0 || ports[i] > 0xffff) {
+                        IP_VS_WARNING("ip_vs_ftp: Ignoring invalid "
+                                      "configuration port[%d] = %d\n",
+                                      i, ports[i]);
+                        continue;
+                }
                 ret = register_ip_vs_app_inc(app, app->protocol, ports[i]);
                 if (ret)
                         break;