staging: ti dspbridge: avoid errors if node handle is zero

As 'zero' can be a perfectly good id, it can be picked up as
a NULL from userspace, avoid issues in API and user apps if node
handle is zero.

Signed-off-by: Ernesto Ramos <ernesto@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/staging/tidspbridge/pmgr/dspapi.c b/drivers/staging/tidspbridge/pmgr/dspapi.c
index 6eda7c5324a8..f46aaf683e37 100644
--- a/drivers/staging/tidspbridge/pmgr/dspapi.c
+++ b/drivers/staging/tidspbridge/pmgr/dspapi.c
@@ -1059,7 +1059,7 @@ inline void find_node_handle(struct node_res_object **noderes,
 {
         rcu_read_lock();
         *noderes = idr_find(((struct process_context *)pr_ctxt)->node_id,
-                                                                (int)hnode);
+                                                                (int)hnode - 1);
         rcu_read_unlock();
         return;
 }
@@ -1077,6 +1077,7 @@ u32 nodewrap_allocate(union trapped_args *args, void *pr_ctxt)
         u8 *pargs = NULL;
         struct dsp_nodeattrin proc_attr_in, *attr_in = NULL;
         struct node_res_object *node_res;
+        int nodeid;
 
         /* Optional argument */
         if (psize) {
@@ -1112,7 +1113,8 @@ u32 nodewrap_allocate(union trapped_args *args, void *pr_ctxt)
                                        attr_in, &node_res, pr_ctxt);
         }
         if (!status) {
-                CP_TO_USR(args->args_node_allocate.ph_node, &node_res->id,
+                nodeid = node_res->id + 1;
+                CP_TO_USR(args->args_node_allocate.ph_node, &nodeid,
                         status, 1);
                 if (status) {
                         status = -EFAULT;