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

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Message-Id: <1456048383-27344-1-git-send-email-richard@nod.at>
Date:	Sun, 21 Feb 2016 10:53:03 +0100
From:	Richard Weinberger <richard@....at>
To:	linux-mtd@...ts.infradead.org
Cc:	dedekind1@...il.com, richard@....at, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: [PATCH] ubi: Fix out of bounds write in volume update code

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

Cc: stable@...r.kernel.org
Signed-off-by: Richard Weinberger <richard@....at>
---
 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 cfeaf0f..b7901ce 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;
 
-- 
1.8.4.5