IB/ehca: Ensure that guid_entry index is not negative

This prevents the memcpy() of a guid_entries element using a negative index.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/ehca/ehca_hca.c b/drivers/infiniband/hw/ehca/ehca_hca.c
index 9209c5332dfe8f8031849cd12fa6dd4b94874906..8b92f85d4dd0eef382420e9d6dd69d7e1c594af1 100644 (file)
--- a/drivers/infiniband/hw/ehca/ehca_hca.c
+++ b/drivers/infiniband/hw/ehca/ehca_hca.c
@@ -319,7 +319,7 @@ int ehca_query_gid(struct ib_device *ibdev, u8 port,
                                              ib_device);
        struct hipz_query_port *rblock;
 
-       if (index > 255) {
+       if (index < 0 || index > 255) {
                ehca_err(&shca->ib_device, "Invalid index: %x.", index);
                return -EINVAL;
        }