1 files changed, 4 insertions, 1 deletions

diff --git a/src/core.c b/src/core.c
index 07bc828..87ef420 100644
--- a/src/core.c
+++ b/src/core.c
@@ -359,7 +359,10 @@ int mtdev_init(struct mtdev *dev)
 
 int mtdev_open(struct mtdev *dev, int fd)
 {
-        int ret;
+        int ret = -EINVAL;
+
+        if (!dev || fd < 0)
+                goto error;
         ret = mtdev_init(dev);
         if (ret)
                 goto error;