[PATCH net] net: sched: initialize with 0 before setting erspan md->u

[Xin Long]

In fl_set_erspan_opt(), all bits of erspan md was set 1, as this
function is also used to set opt MASK. However, when setting for
md->u.index for opt VALUE, the rest bits of the union md->u will
be left 1. It would cause to fail the match of the whole md when
version is 1 and only index is set.

This patch is to fix by initializing with 0 before setting erspan
md->u.

Reported-by: Shuang Li <shu...@redhat.com>
Fixes: 79b1011cb33d ("net: sched: allow flower to match erspan options")
Signed-off-by: Xin Long <lucien....@gmail.com>
---
 net/sched/cls_flower.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index a4f7ef1..19a8fa2 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -1221,6 +1221,7 @@ static int fl_set_erspan_opt(const struct nlattr *nla, 
struct fl_flow_key *key,
                }
                if (tb[TCA_FLOWER_KEY_ENC_OPT_ERSPAN_INDEX]) {
                        nla = tb[TCA_FLOWER_KEY_ENC_OPT_ERSPAN_INDEX];
+                       memset(&md->u, 0x00, sizeof(md->u));
                        md->u.index = nla_get_be32(nla);
                }
        } else if (md->version == 2) {
-- 
2.1.0