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SubjectRe: [PATCH] mtd: spi-nor: Check for spi_nor_hwcaps_read2cmd() return value
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Am Montag, 18. September 2017, 11:39:45 CEST schrieb Boris Brezillon:
> On Sun, 17 Sep 2017 11:57:50 +0200
>
> Richard Weinberger <richard@nod.at> wrote:
> > The function can return a negativ value in case of errors,
> > don't use it blindly as array index.
> >
> > Detected by CoverityScan CID#1418067 ("Memory - illegal accesses")
> > Fixes: f384b352cbf0 ("mtd: spi-nor: parse Serial Flash Discoverable
> > Parameters (SFDP) tables")
>
> Hm, not sure but I think "Fixes:" should not be wrapped.

Hmm, vi tried to be smart. ;-\

>
> > Signed-off-by: Richard Weinberger <richard@nod.at>
> > ---
> >
> > drivers/mtd/spi-nor/spi-nor.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> > index cf1d4a15e10a..d71765739a93 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -2145,6 +2145,9 @@ static int spi_nor_parse_bfpt(struct spi_nor *nor,
> >
> > params->hwcaps.mask |= rd->hwcaps;
> > cmd = spi_nor_hwcaps_read2cmd(rd->hwcaps);
> >
> > + if (cmd < 0)
> > + return -EINVAL;
>
> Why not returning cmd directly?

I thought about that too but the only other user of that function also returns
-EINVAL upon error.
Maybe Cyrille can give more input whether we should propagate
spi_nor_hwcaps_read2cmd()'s return values or not.

Thanks,
//richard

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