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

mtd: nand: check ecc->total sanity in nand_scan_tail

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mtd-nand-check-ecc-total-sanity-in-nand_scan_tail.patch and it can be found in the queue-4.9 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 foo@baz Mon Apr 9 17:09:24 CEST 2018

From: Masahiro Yamada yamada.masahiro@socionext.com Date: Thu, 25 May 2017 13:50:20 +0900 Subject: mtd: nand: check ecc->total sanity in nand_scan_tail

From: Masahiro Yamada yamada.masahiro@socionext.com

[ Upstream commit 79e0348c4e24fd1affdcf055e0269755580e0fcc ]

Drivers are supposed to set correct ecc->{size,strength,bytes} before calling nand_scan_tail(), but it does not complain about ecc->total bigger than oobsize.

In this case, chip->scan_bbt() crashes due to memory corruption, but it is hard to debug. It would be kind to fail it earlier with a clear message.

Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com Signed-off-by: Boris Brezillon boris.brezillon@free-electrons.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mtd/nand/nand_base.c | 5 +++++ 1 file changed, 5 insertions(+)

--- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -4785,6 +4785,11 @@ int nand_scan_tail(struct mtd_info *mtd) goto err_free; } ecc->total = ecc->steps * ecc->bytes; + if (ecc->total > mtd->oobsize) { + WARN(1, "Total number of ECC bytes exceeded oobsize\n"); + ret = -EINVAL; + goto err_free; + }

/* * The number of bytes available for a client to place data into

Patches currently in stable-queue which might be from yamada.masahiro@socionext.com are

queue-4.9/tags-honor-compiled_source-with-apart-output-directory.patch queue-4.9/drivers-misc-vmw_vmci-vmci_queue_pair.c-fix-a-couple-integer-overflow-tests.patch queue-4.9/mtd-nand-check-ecc-total-sanity-in-nand_scan_tail.patch