Commit e4f6daac authored Feb 21, 2016 by Richard Weinberger

ubi: Fix out of bounds write in volume update code



ubi_start_leb_change() allocates too few bytes.
ubi_more_leb_change_data() will write up to req->upd_bytes +
ubi->min_io_size bytes.

Cc: stable@vger.kernel.org
Signed-off-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>

parent fc77dbd3

drivers/mtd/ubi/upd.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -193,7 +193,7 @@ int ubi_start_leb_change(struct ubi_device ubi, struct ubi_volume vol,
		vol->changing_leb = 1;
		vol->ch_lnum = req->lnum;

		vol->upd_buf = vmalloc(req->bytes);
		vol->upd_buf = vmalloc(ALIGN((int)req->bytes, ubi->min_io_size));
		if (!vol->upd_buf)
		return -ENOMEM;