[PATCH v2 61/62] ubi: Fix out of bounds write in volume update code

[Teresa Remmet]

From: Richard Weinberger <richard at nod.at>

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 at vger.kernel.org
Signed-off-by: Richard Weinberger <richard at nod.at>
Reviewed-by: Boris Brezillon <boris.brezillon at free-electrons.com>
Signed-off-by: Teresa Remmet <t.remmet at phytec.de>
---
 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 5e06753..33d4dbf 100644
--- a/drivers/mtd/ubi/upd.c
+++ b/drivers/mtd/ubi/upd.c
@@ -201,7 +201,7 @@ 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;
 
-- 
1.9.1