IB/core: Use kmemdup() instead of kmalloc()+memcpy()

Use kmemdup when some other buffer is immediately copied into the
allocated region.

A simplified version of the semantic patch that makes this change is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression from,to,size,flag;
statement S;
@@

-  to = \(kmalloc\|kzalloc\)(size,flag);
+  to = kmemdup(from,size,flag);
   if (to==NULL || ...) S
-  memcpy(to, from, size);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

2 files changed, 3 insertions, 5 deletions

diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 6d777069d86d..ce2e87b72858 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -1677,13 +1677,13 @@ int rdma_set_ib_paths(struct rdma_cm_id *id,
         if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
                 return -EINVAL;
 
-        id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
+        id->route.path_rec = kmemdup(path_rec, sizeof *path_rec * num_paths,
+                                     GFP_KERNEL);
         if (!id->route.path_rec) {
                 ret = -ENOMEM;
                 goto err;
         }
 
-        memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
         id->route.num_paths = num_paths;
         return 0;
 err:
diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index 1df1194aeba4..6dc7b77d5d29 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -291,13 +291,11 @@ struct ib_mad_agent *ib_register_mad_agent(struct ib_device *device,
         }
 
         if (mad_reg_req) {
-                reg_req = kmalloc(sizeof *reg_req, GFP_KERNEL);
+                reg_req = kmemdup(mad_reg_req, sizeof *reg_req, GFP_KERNEL);
                 if (!reg_req) {
                         ret = ERR_PTR(-ENOMEM);
                         goto error3;
                 }
-                /* Make a copy of the MAD registration request */
-                memcpy(reg_req, mad_reg_req, sizeof *reg_req);
         }
 
         /* Now, fill in the various structures */