linux-kernel - [PATCH] mtd: rawnand: tegra: check bounds of die

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Date:   Wed,  4 Jul 2018 11:13:10 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     boris.brezillon@...tlin.com, miquel.raynal@...tlin.com
Cc:     dwmw2@...radead.org, computersforpeace@...il.com,
        marek.vasut@...il.com, dan.carpenter@...cle.com, dev@...xeye.de,
        richard@....at, marcel@...wiler.com, krzk@...nel.org,
        digetx@...il.com, benjamin.lindqvist@...ian.se,
        mirza.krak@...il.com, gaireg@...reg.de,
        linux-mtd@...ts.infradead.org, linux-tegra@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stefan Agner <stefan@...er.ch>
Subject: [PATCH] mtd: rawnand: tegra: check bounds of die_nr properly

The Tegra driver currently only support a single chip select, hence
check boundaries accordingly. This fixes a off by one issue catched
with Smatch:
    drivers/mtd/nand/raw/tegra_nand.c:476 tegra_nand_select_chip()
    warn: array off by one? 'nand->cs[die_nr]'

Also warn in case the stack asks for a chip select we currently do
not support.

Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Stefan Agner <stefan@...er.ch>
---
 drivers/mtd/nand/raw/tegra_nand.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/tegra_nand.c b/drivers/mtd/nand/raw/tegra_nand.c
index 4daa88d814134..e65ef584df0b9 100644
--- a/drivers/mtd/nand/raw/tegra_nand.c
+++ b/drivers/mtd/nand/raw/tegra_nand.c
@@ -468,7 +468,9 @@ static void tegra_nand_select_chip(struct mtd_info *mtd, int die_nr)
 	struct tegra_nand_chip *nand = to_tegra_chip(chip);
 	struct tegra_nand_controller *ctrl = to_tegra_ctrl(chip->controller);
 
-	if (die_nr < 0 || die_nr > 1) {
+	WARN_ON(die_nr >= ARRAY_SIZE(nand->cs));
+
+	if (die_nr < 0 || die_nr > 0) {
 		ctrl->cur_cs = -1;
 		return;
 	}
-- 
2.18.0