diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c
index 70e8bdf34be900f744e821fb237641a27bb71a7b..e01235f3cd5cc5af73c8f0cd46ebbfeb305eb776 100644
--- a/drivers/net/netdevsim/health.c
+++ b/drivers/net/netdevsim/health.c
@@ -149,6 +149,8 @@ static ssize_t nsim_dev_health_break_write(struct file *file,
        char *break_msg;
        int err;
 
+       if (count >= KMALLOC_MAX_SIZE)
+               return -ENOMEM;
        break_msg = memdup_user_nul(data, count);
        if (IS_ERR(break_msg))
                return PTR_ERR(break_msg);