UBI: Validate data_size



Make sure that data_size is less than LEB size.
Otherwise a handcrafted UBI image is able to trigger
an out of bounds memory access in ubi_compare_lebs().

Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: David Gstir <david@sigma-star.at>

parent cf6f54e3

drivers/mtd/ubi/io.c

+5 −0

Original line number	Original line	Diff line number	Diff line
	@@ -926,6 +926,11 @@ static int validate_vid_hdr(const struct ubi_device *ubi,
	goto bad;		goto bad;
	}		}

			if (data_size > ubi->leb_size) {
			ubi_err(ubi, "bad data_size");
			goto bad;
			}

	if (vol_type == UBI_VID_STATIC) {		if (vol_type == UBI_VID_STATIC) {
	/*		/*
	* Although from high-level point of view static volumes may		* Although from high-level point of view static volumes may