From e4acb524a7f9c689d34994326d64c722ac12152b Mon Sep 17 00:00:00 2001
From: Ralph Metzler <rjkm@metzlerbros.de>
Date: Wed, 6 Sep 2017 17:51:30 +0200
Subject: [PATCH] return EINVAL if input NULL (e.g. in case of mod devices)

---
 ddbridge/ddbridge-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ddbridge/ddbridge-core.c b/ddbridge/ddbridge-core.c
index c8e423f..7d79471 100644
--- a/ddbridge/ddbridge-core.c
+++ b/ddbridge/ddbridge-core.c
@@ -857,6 +857,8 @@ static ssize_t ts_read(struct file *file, __user char *buf,
 
 	if (!dev->has_dma)
 		return -EINVAL;
+	if (!input)
+		return -EINVAL;
 	while (left) {
 		if (ddb_input_avail(input) < 188) {
 			if (file->f_flags & O_NONBLOCK)