* [PATCH] pinctrl: imx: Check for memory allocation failure
@ 2017-05-06 8:23 Christophe JAILLET
2017-05-06 19:40 ` Stafford Horne
2017-05-12 9:11 ` Linus Walleij
0 siblings, 2 replies; 5+ messages in thread
From: Christophe JAILLET @ 2017-05-06 8:23 UTC (permalink / raw)
To: linus.walleij, gary.bisson, vladimir_zapolskiy, tony, vivien.didelot
Cc: linux-gpio, linux-kernel, kernel-janitors, Christophe JAILLET
If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
Return -ENOMEM instead, as done for the other memory allocation just a
few lines below.
BTW, change the 'devm_kzalloc' into a 'devm_kcalloc'.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
---
drivers/pinctrl/freescale/pinctrl-imx.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
index 74bd90dfd7b1..90a946c028ff 100644
--- a/drivers/pinctrl/freescale/pinctrl-imx.c
+++ b/drivers/pinctrl/freescale/pinctrl-imx.c
@@ -581,9 +581,10 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
dev_err(info->dev, "no groups defined in %s\n", np->full_name);
return -EINVAL;
}
- func->group_names = devm_kzalloc(info->dev,
- func->num_group_names *
+ func->group_names = devm_kcalloc(info->dev, func->num_group_names,
sizeof(char *), GFP_KERNEL);
+ if (!func->group_names)
+ return -ENOMEM;
for_each_child_of_node(np, child) {
func->group_names[i] = child->name;
--
2.11.0
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] pinctrl: imx: Check for memory allocation failure
2017-05-06 8:23 [PATCH] pinctrl: imx: Check for memory allocation failure Christophe JAILLET
@ 2017-05-06 19:40 ` Stafford Horne
2017-05-09 7:27 ` Dan Carpenter
2017-05-12 9:11 ` Linus Walleij
1 sibling, 1 reply; 5+ messages in thread
From: Stafford Horne @ 2017-05-06 19:40 UTC (permalink / raw)
To: Christophe JAILLET
Cc: linus.walleij, gary.bisson, vladimir_zapolskiy, tony,
vivien.didelot, linux-gpio, linux-kernel, kernel-janitors
Hi Christophe,
On Sat, May 06, 2017 at 10:23:59AM +0200, Christophe JAILLET wrote:
> If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
> Return -ENOMEM instead, as done for the other memory allocation just a
> few lines below.
This looks fine.
> BTW, change the 'devm_kzalloc' into a 'devm_kcalloc'.
Any reason for the devm_kcalloc change? It looks like the next for loop
does set all of the group_name values.
-Stafford
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> drivers/pinctrl/freescale/pinctrl-imx.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/pinctrl/freescale/pinctrl-imx.c b/drivers/pinctrl/freescale/pinctrl-imx.c
> index 74bd90dfd7b1..90a946c028ff 100644
> --- a/drivers/pinctrl/freescale/pinctrl-imx.c
> +++ b/drivers/pinctrl/freescale/pinctrl-imx.c
> @@ -581,9 +581,10 @@ static int imx_pinctrl_parse_functions(struct device_node *np,
> dev_err(info->dev, "no groups defined in %s\n", np->full_name);
> return -EINVAL;
> }
> - func->group_names = devm_kzalloc(info->dev,
> - func->num_group_names *
> + func->group_names = devm_kcalloc(info->dev, func->num_group_names,
> sizeof(char *), GFP_KERNEL);
> + if (!func->group_names)
> + return -ENOMEM;
>
> for_each_child_of_node(np, child) {
> func->group_names[i] = child->name;
> --
> 2.11.0
>
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] pinctrl: imx: Check for memory allocation failure
2017-05-06 19:40 ` Stafford Horne
@ 2017-05-09 7:27 ` Dan Carpenter
2017-05-09 12:31 ` Stafford Horne
0 siblings, 1 reply; 5+ messages in thread
From: Dan Carpenter @ 2017-05-09 7:27 UTC (permalink / raw)
To: Stafford Horne
Cc: Christophe JAILLET, linus.walleij, gary.bisson,
vladimir_zapolskiy, tony, vivien.didelot, linux-gpio,
linux-kernel, kernel-janitors
On Sun, May 07, 2017 at 04:40:38AM +0900, Stafford Horne wrote:
> Hi Christophe,
>
> On Sat, May 06, 2017 at 10:23:59AM +0200, Christophe JAILLET wrote:
> > If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
> > Return -ENOMEM instead, as done for the other memory allocation just a
> > few lines below.
>
> This looks fine.
>
> > BTW, change the 'devm_kzalloc' into a 'devm_kcalloc'.
>
> Any reason for the devm_kcalloc change? It looks like the next for loop
> does set all of the group_name values.
>
The advantage of kcalloc() over kzalloc() is the integer overflow
checking. There is kmalloc_array() if we don't need to zero the memory.
regards,
dan carpenter
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] pinctrl: imx: Check for memory allocation failure
2017-05-09 7:27 ` Dan Carpenter
@ 2017-05-09 12:31 ` Stafford Horne
0 siblings, 0 replies; 5+ messages in thread
From: Stafford Horne @ 2017-05-09 12:31 UTC (permalink / raw)
To: Dan Carpenter
Cc: Christophe JAILLET, linus.walleij, gary.bisson,
vladimir_zapolskiy, tony, vivien.didelot, linux-gpio,
linux-kernel, kernel-janitors
On Tue, May 09, 2017 at 10:27:20AM +0300, Dan Carpenter wrote:
> On Sun, May 07, 2017 at 04:40:38AM +0900, Stafford Horne wrote:
> > Hi Christophe,
> >
> > On Sat, May 06, 2017 at 10:23:59AM +0200, Christophe JAILLET wrote:
> > > If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
> > > Return -ENOMEM instead, as done for the other memory allocation just a
> > > few lines below.
> >
> > This looks fine.
> >
> > > BTW, change the 'devm_kzalloc' into a 'devm_kcalloc'.
> >
> > Any reason for the devm_kcalloc change? It looks like the next for loop
> > does set all of the group_name values.
> >
>
> The advantage of kcalloc() over kzalloc() is the integer overflow
> checking. There is kmalloc_array() if we don't need to zero the memory.
Right, usually its good to have a reason why in the commit log. i.e.
BTW, change the 'devm_kzalloc' into a 'devm_kcalloc' for overflow checking.
Or switch to devm_kmalloc_array() and say: for overflow checking and no
need for zeroing.
-Stafford
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] pinctrl: imx: Check for memory allocation failure
2017-05-06 8:23 [PATCH] pinctrl: imx: Check for memory allocation failure Christophe JAILLET
2017-05-06 19:40 ` Stafford Horne
@ 2017-05-12 9:11 ` Linus Walleij
1 sibling, 0 replies; 5+ messages in thread
From: Linus Walleij @ 2017-05-12 9:11 UTC (permalink / raw)
To: Christophe JAILLET
Cc: Gary Bisson, Vladimir Zapolskiy, ext Tony Lindgren,
Vivien Didelot, linux-gpio, linux-kernel, kernel-janitors
On Sat, May 6, 2017 at 10:23 AM, Christophe JAILLET
<christophe.jaillet@wanadoo.fr> wrote:
> If 'devm_kzalloc' fails, a NULL pointer will be dereferenced.
> Return -ENOMEM instead, as done for the other memory allocation just a
> few lines below.
> BTW, change the 'devm_kzalloc' into a 'devm_kcalloc'.
>
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Patch applied.
Yours,
Linus Walleij
^ permalink raw reply [flat|nested] 5+ messages in thread
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2017-05-06 8:23 [PATCH] pinctrl: imx: Check for memory allocation failure Christophe JAILLET
2017-05-06 19:40 ` Stafford Horne
2017-05-09 7:27 ` Dan Carpenter
2017-05-09 12:31 ` Stafford Horne
2017-05-12 9:11 ` Linus Walleij
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