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    Subject[PATCH 4.2.y-ckt 69/98] ubi: Fix out of bounds write in volume update code
    Date
    4.2.8-ckt6 -stable review patch.  If anyone has any objections, please let me know.

    ---8<------------------------------------------------------------

    From: Richard Weinberger <richard@nod.at>

    commit e4f6daac20332448529b11f09388f1d55ef2084c upstream.

    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.

    Signed-off-by: Richard Weinberger <richard@nod.at>
    Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
    Signed-off-by: Kamal Mostafa <kamal@canonical.com>
    ---
    drivers/mtd/ubi/upd.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/mtd/ubi/upd.c b/drivers/mtd/ubi/upd.c
    index 2a1b6e0..0134ba3 100644
    --- a/drivers/mtd/ubi/upd.c
    +++ b/drivers/mtd/ubi/upd.c
    @@ -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;

    --
    2.7.0
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