diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 6b3a8f62fa89..cd5bb0f9fee6 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -119,6 +119,10 @@ static ssize_t sysfs_kf_read(struct kernfs_open_file *of, char *buf,
 	len = ops->show(kobj, of->kn->priv, buf);
 	if (len < 0)
 		return len;
+	if (len >= (ssize_t)PAGE_SIZE) {
+		printk("fill_read_buffer: %pS returned bad count\n", ops->show);
+		len = PAGE_SIZE - 1;
+	}
 	if (pos) {
 		if (len <= pos)
 			return 0;