lkml.org 
[lkml]   [2019]   [Apr]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] mtd: rawnand: vf610: Fix to check for NULL pointer dereference
On Mon, 1 Apr 2019 17:26:51 +0200
Miquel Raynal <miquel.raynal@bootlin.com> wrote:

> Hi Aditya,
>
> Aditya Pakki <pakki001@umn.edu> wrote on Mon, 18 Mar 2019 18:24:34
> -0500:
>
> > of_match_device can return NULL if there is no matching device is found.
> > The patch avoids a potential NULL pointer dereference by checking for the
> > return value and passing the error upstream.
> >
> > Signed-off-by: Aditya Pakki <pakki001@umn.edu>
> > ---
> > drivers/mtd/nand/raw/vf610_nfc.c | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/mtd/nand/raw/vf610_nfc.c b/drivers/mtd/nand/raw/vf610_nfc.c
> > index a662ca1970e5..946abbb275c3 100644
> > --- a/drivers/mtd/nand/raw/vf610_nfc.c
> > +++ b/drivers/mtd/nand/raw/vf610_nfc.c
> > @@ -850,6 +850,8 @@ static int vf610_nfc_probe(struct platform_device *pdev)
> > }
> >
> > of_id = of_match_device(vf610_nfc_dt_ids, &pdev->dev);
> > + if (!of_id)
> > + return -ENODEV;

For the record, this can't happen unless you have serious memory
corruption issues since you reached the ->probe() function (which means
a match was found before).

> > nfc->variant = (enum vf610_nfc_variant)of_id->data;
> >
> > for_each_available_child_of_node(nfc->dev->of_node, child) {
>
>
> Applied to git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux.git
> on nand/next with the title changed to
>
> mtd: rawnand: vf610: Avoid a potential NULL pointer dereference
>
> and a space after the return statement.
>
> Thanks,
> Miquèl

\
 
 \ /
  Last update: 2019-04-01 17:31    [W:0.034 / U:12.680 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site