linux-kernel - [PATCH 3.2 57/62] ubi: Fix out of bounds write in volume update code

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Date:	Tue, 29 Mar 2016 20:18:22 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Boris Brezillon" <boris.brezillon@...e-electrons.com>,
	"Richard Weinberger" <richard@....at>
Subject: [PATCH 3.2 57/62] ubi: Fix out of bounds write in volume update code

3.2.79-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....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@....at>
Reviewed-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/mtd/ubi/upd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/ubi/upd.c
+++ b/drivers/mtd/ubi/upd.c
@@ -197,7 +197,7 @@ int ubi_start_leb_change(struct ubi_devi
 	vol->ch_lnum = req->lnum;
 	vol->ch_dtype = req->dtype;
 
-	vol->upd_buf = vmalloc(req->bytes);
+	vol->upd_buf = vmalloc(ALIGN((int)req->bytes, ubi->min_io_size));
 	if (!vol->upd_buf)
 		return -ENOMEM;