lkml.org 
[lkml]   [2016]   [Apr]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] mtd: nand: fix NULL pointer dereference in of_get_nand_ecc_algo
On Tue, 26 Apr 2016 20:36:16 +0200
Rafał Miłecki <zajec5@gmail.com> wrote:

> Our array nand_ecc_algos doesn't specify mappings for all available
> enum nand_ecc_algo values. The one missing there is NAND_ECC_UNKNOWN
> as this value is reserved for algorithm not being specified at all.
> It means we have to be careful when iterating this array and handle
> NULL values.
>
> Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
> ---
> Hi Boris,
>
> Sorry for this crash in nand subsystem :( If you think it's OK you may
> pick this patch as a fixup for
> c6e002a7ca9f ("mtd: nand: add support for "nand-ecc-algo" DT property")
> ---
> drivers/mtd/nand/nand_base.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
> index a5417a0..0eaa9dc 100644
> --- a/drivers/mtd/nand/nand_base.c
> +++ b/drivers/mtd/nand/nand_base.c
> @@ -4016,6 +4016,8 @@ static int of_get_nand_ecc_algo(struct device_node *np)
> err = of_property_read_string(np, "nand-ecc-algo", &pm);
> if (!err) {
> for (i = 0; i < ARRAY_SIZE(nand_ecc_algos); i++)
> + if (!nand_ecc_algos[i])
> + continue;

Can we add an "unknown" entry, or start iterating at NAND_ECC_HAMMING
or NAND_ECC_UNKNOWN + 1 instead of adding this extra test?

BTW, since the original commit has been applied recently I'll squash the
changes into the previous commit and rebase my branch instead of adding
a new patch (I hate breaking bisectability).


--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com

\
 
 \ /
  Last update: 2016-04-26 21:21    [W:0.067 / U:0.120 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site