module: Correctly truncate sysfs sections output

	struct module_sect_attr attrs[];

};

#define MODULE_SECT_READ_SIZE (3 /* "0x", "\n" */ + (BITS_PER_LONG / 4))

static ssize_t module_sect_read(struct file *file, struct kobject *kobj,

				struct bin_attribute *battr,

				char *buf, loff_t pos, size_t count)

{

	struct module_sect_attr *sattr =

		container_of(battr, struct module_sect_attr, battr);

	char bounce[MODULE_SECT_READ_SIZE + 1];

	size_t wrote;

	if (pos != 0)

		return -EINVAL;

	return sprintf(buf, "0x%px\n",

		       kallsyms_show_value(file->f_cred) ? (void *)sattr->address : NULL);

	/*

	 * Since we're a binary read handler, we must account for the

	 * trailing NUL byte that sprintf will write: if "buf" is

	 * too small to hold the NUL, or the NUL is exactly the last

	 * byte, the read will look like it got truncated by one byte.

	 * Since there is no way to ask sprintf nicely to not write

	 * the NUL, we have to use a bounce buffer.

	 */

	wrote = scnprintf(bounce, sizeof(bounce), "0x%px\n",

			 kallsyms_show_value(file->f_cred)

				? (void *)sattr->address : NULL);

	count = min(count, wrote);

	memcpy(buf, bounce, count);

	return count;

}

static void free_sect_attrs(struct module_sect_attrs *sect_attrs)

			goto out;

		sect_attrs->nsections++;

		sattr->battr.read = module_sect_read;

		sattr->battr.size = 3 /* "0x", "\n" */ + (BITS_PER_LONG / 4);

		sattr->battr.size = MODULE_SECT_READ_SIZE;

		sattr->battr.attr.mode = 0400;

		*(gattr++) = &(sattr++)->battr;

	}