1 files changed, 3 insertions, 0 deletions

diff --git a/fs/autofs4/dev-ioctl.c b/fs/autofs4/dev-ioctl.c
index 3182c0e68b42..232e03d4780d 100644
--- a/fs/autofs4/dev-ioctl.c
+++ b/fs/autofs4/dev-ioctl.c
@@ -103,6 +103,9 @@ static struct autofs_dev_ioctl *copy_dev_ioctl(struct autofs_dev_ioctl __user *i
         if (tmp.size < sizeof(tmp))
                 return ERR_PTR(-EINVAL);
 
+        if (tmp.size > (PATH_MAX + sizeof(tmp)))
+                return ERR_PTR(-ENAMETOOLONG);
+
         return memdup_user(in, tmp.size);
 }