Patch "mtd: nand: atmel: fix buffer overflow in atmel_pmecc_user" has been added to the 4.13-stable tree

Patch "mtd: nand: atmel: fix buffer overflow in atmel_pmecc_user" has been added to the 4.13-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    mtd: nand: atmel: fix buffer overflow in atmel_pmecc_user

to the 4.13-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     mtd-nand-atmel-fix-buffer-overflow-in-atmel_pmecc_user.patch
and it can be found in the queue-4.13 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 36de80740008e6a4a55115b4a92e2059e47c1cba Mon Sep 17 00:00:00 2001
From: Richard Genoud <richard.genoud@gmail.com>
Date: Wed, 27 Sep 2017 14:49:17 +0200
Subject: mtd: nand: atmel: fix buffer overflow in atmel_pmecc_user

From: Richard Genoud <richard.genoud@gmail.com>

commit 36de80740008e6a4a55115b4a92e2059e47c1cba upstream.

When calculating the size needed by struct atmel_pmecc_user *user,
the dmu and delta buffer sizes were forgotten.
This lead to a memory corruption (especially with a large ecc_strength).

Link: http://lkml.kernel.org/r/1506503157.3016.5.camel@gmail.com
Fixes: f88fc122cc34 ("mtd: nand: Cleanup/rework the atmel_nand driver")
Reported-by: Richard Genoud <richard.genoud@gmail.com>
Pointed-at-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Reviewed-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/mtd/nand/atmel/pmecc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/mtd/nand/atmel/pmecc.c
+++ b/drivers/mtd/nand/atmel/pmecc.c
@@ -363,7 +363,7 @@ atmel_pmecc_create_user(struct atmel_pme
 	size += (req->ecc.strength + 1) * sizeof(u16);
 	/* Reserve space for mu, dmu and delta. */
 	size = ALIGN(size, sizeof(s32));
-	size += (req->ecc.strength + 1) * sizeof(s32);
+	size += (req->ecc.strength + 1) * sizeof(s32) * 3;
 
 	user = kzalloc(size, GFP_KERNEL);
 	if (!user)


Patches currently in stable-queue which might be from richard.genoud@gmail.com are

queue-4.13/mtd-nand-atmel-fix-buffer-overflow-in-atmel_pmecc_user.patch