linux-kernel - Re: [PATCH] mtd: rawnand: fsl_upm: Fix an off-by one test in fun_exec

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Date:   Fri, 21 Jul 2023 09:59:52 +0300
From:   Dan Carpenter <dan.carpenter@...aro.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-mtd@...ts.infradead.org, Julia Lawall <Julia.Lawall@...6.fr>,
        Harshit Mogalapalli <harshit.m.mogalapalli@...il.com>
Subject: Re: [PATCH] mtd: rawnand: fsl_upm: Fix an off-by one test in
 fun_exec_op()

On Fri, Jul 21, 2023 at 09:55:02AM +0300, Dan Carpenter wrote:
> On Fri, Jul 21, 2023 at 08:37:02AM +0300, Dan Carpenter wrote:
> > Harshit and I were mucking with this about yesterday.  He made
> > Coccinelle script as well.
> > 
> > We found three bugs in max9286_parse_dt(), hisi_inno_phy_probe() and
> > jent_testing_store().  Only the one in hisi_inno_phy_probe() is real
> > life bad because the others do an out of bounds check followed by a
> > mask.
> 
> Actually wait.  hisi_inno_phy_probe() is not a bug at all.
> MAX9286_NUM_GMSL and MAX9286_NUM_GMSL are both 4.

Gar, wow.  hisi_inno_phy_probe() is a bug.  max9286_parse_dt() is not
a bug.

Smatch would have found max9286_parse_dt() if it had been a bug.  The
reason why smatch didn't find hisi_inno_phy_probe() is because of how
Smatch takes a short cut when parsing loops.

regards,
dan carpenter