wext: add checked wrappers for adding events/points to streams

These checked wrappers are necessary for the next patch, which
will use them to avoid sending out partial scan results.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/net/iw_handler.h b/include/net/iw_handler.h
index a830b01baba4..8f81bbbc38fc 100644
--- a/include/net/iw_handler.h
+++ b/include/net/iw_handler.h
@@ -519,6 +519,17 @@ iwe_stream_add_event(struct iw_request_info *info, char *stream, char *ends,
         return stream;
 }
 
+static inline char *
+iwe_stream_add_event_check(struct iw_request_info *info, char *stream,
+                           char *ends, struct iw_event *iwe, int event_len)
+{
+        char *res = iwe_stream_add_event(info, stream, ends, iwe, event_len);
+
+        if (res == stream)
+                return ERR_PTR(-E2BIG);
+        return res;
+}
+
 /*------------------------------------------------------------------*/
 /*
  * Wrapper to add an short Wireless Event containing a pointer to a
@@ -545,6 +556,17 @@ iwe_stream_add_point(struct iw_request_info *info, char *stream, char *ends,
         return stream;
 }
 
+static inline char *
+iwe_stream_add_point_check(struct iw_request_info *info, char *stream,
+                           char *ends, struct iw_event *iwe, char *extra)
+{
+        char *res = iwe_stream_add_point(info, stream, ends, iwe, extra);
+
+        if (res == stream)
+                return ERR_PTR(-E2BIG);
+        return res;
+}
+
 /*------------------------------------------------------------------*/
 /*
  * Wrapper to add a value to a Wireless Event in a stream of events.