Input: libps2 - warn instead of oopsing when passed bad arguments

This is more user-friendly and also fixes Coverity #id 249

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index 61a6f977846f..ed202f2f251a 100644
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -177,6 +177,11 @@ int ps2_command(struct ps2dev *ps2dev, unsigned char *param, int command)
                 return -1;
         }
 
+        if (send && !param) {
+                WARN_ON(1);
+                return -1;
+        }
+
         mutex_lock_nested(&ps2dev->cmd_mutex, SINGLE_DEPTH_NESTING);
 
         serio_pause_rx(ps2dev->serio);