ta(file_inode(file));
 	int err;
 
+	if (count == 0 || count > PAGE_SIZE)
+		return -EINVAL;
+
+	tmp = memdup_user_nul(buf, count);
 	if (IS_ERR(tmp))
 		return PTR_ERR(tmp);
 FAILED: patch "[PATCH] xtensa: simdisk: add input size check in proc_write_simdisk" failed to apply to 5.15-stable tree<gregkh@linuxfoundation.org> undefinedlinmq006@gmail.com,jcmvbkbc@gmail.com undefined undefined undefined‚xƒ;