IB/core: Clear AH attr variable to prevent garbage data

During create-ah from userspace, uverbs is sending garbage data in
attr.dmac and attr.vlan_id.  This patch sets attr.dmac and
attr.vlan_id to zero.

Fixes: dd5f03beb4f7 ("IB/core: Ethernet L2 attributes in verbs/cm structures")
Signed-off-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 0600c50e6215..5ba2a86aab6a 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -2518,6 +2518,8 @@ ssize_t ib_uverbs_create_ah(struct ib_uverbs_file *file,
         attr.grh.sgid_index    = cmd.attr.grh.sgid_index;
         attr.grh.hop_limit     = cmd.attr.grh.hop_limit;
         attr.grh.traffic_class = cmd.attr.grh.traffic_class;
+        attr.vlan_id           = 0;
+        memset(&attr.dmac, 0, sizeof(attr.dmac));
         memcpy(attr.grh.dgid.raw, cmd.attr.grh.dgid, 16);
 
         ah = ib_create_ah(pd, &attr);