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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@oracle.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
This commit is contained in:
Stefan Agner 2018-07-17 10:46:18 +02:00 committed by Miquel Raynal
parent 6a943386ee
commit d535934a9a
1 changed files with 3 additions and 1 deletions
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4
drivers/mtd/nand/raw/tegra_nand.c
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@ -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 >= (int)ARRAY_SIZE(nand->cs));
if (die_nr < 0 || die_nr > 0) {
ctrl->cur_cs = -1;
return;
}