X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=drivers%2Finput%2Fserio%2Flibps2.c;h=ed202f2f251aa76eeb3b680186a7baa7ddefaa7a;hb=95349fe8144b7d18f04bdca1c2d3fb85789de4fb;hp=61a6f977846f3fe999ebddd5d58a839e8dac5472;hpb=060ec6f2fb3c8abb85927758de8ac5d1018e6a43;p=firefly-linux-kernel-4.4.55.git

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);