staging: ti dspbridge: avoid errors if stream id 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 stream
handle is zero.

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

1 files changed, 6 insertions, 2 deletions

diff --git a/drivers/staging/tidspbridge/pmgr/dspapi.c b/drivers/staging/tidspbridge/pmgr/dspapi.c
index 47892dd47388..7b42f72a97b2 100644
--- a/drivers/staging/tidspbridge/pmgr/dspapi.c
+++ b/drivers/staging/tidspbridge/pmgr/dspapi.c
@@ -1527,7 +1527,7 @@ inline void find_strm_handle(struct strm_res_object **strmres,
 {
         rcu_read_lock();
         *strmres = idr_find(((struct process_context *)pr_ctxt)->stream_id,
-                                                        (int)hstream);
+                                                        (int)hstream - 1);
         rcu_read_unlock();
         return;
 }
@@ -1724,6 +1724,7 @@ u32 strmwrap_open(union trapped_args *args, void *pr_ctxt)
         struct strm_res_object *strm_res_obj;
         struct dsp_streamattrin strm_attr_in;
         struct node_res_object *node_res;
+        int strmid;
 
         find_node_handle(&node_res, pr_ctxt, args->args_strm_open.hnode);
 
@@ -1745,7 +1746,10 @@ u32 strmwrap_open(union trapped_args *args, void *pr_ctxt)
                            args->args_strm_open.direction,
                            args->args_strm_open.index, &attr, &strm_res_obj,
                            pr_ctxt);
-        CP_TO_USR(args->args_strm_open.ph_stream, &strm_res_obj->id, status, 1);
+        if (!status) {
+                strmid = strm_res_obj->id + 1;
+                CP_TO_USR(args->args_strm_open.ph_stream, &strmid, status, 1);
+        }
         return status;
 }