Re: [PATCH v2] Documentation: power: Use kcalloc() instead of kzalloc()

[Yanteng Si <siyanteng@xxxxxxxxxxx>]

在 2024/1/23 01:11, Hu Haowen 写道:
> 在 2024/1/21 18:43, Erick Archer 写道:
> > As noted in the "Deprecated Interfaces, Language Features, Attributes,
> > and Conventions" documentation [1], size calculations (especially
> > multiplication) should not be performed in memory allocator (or similar)
> > function arguments due to the risk of them overflowing. This could lead
> > to values wrapping around and a smaller allocation being made than the
> > caller was expecting. Using those allocations could lead to linear
> > overflows of heap memory and other misbehaviors.
> >
> > So, in the example code use the purpose specific kcalloc() function
> > instead of the argument size * count in the kzalloc() function.
> >
> > At the same time, modify the translations accordingly.
> >
> > Link: 
> > https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments 
> > [1]
> > Link: https://github.com/KSPP/linux/issues/162
> > Signed-off-by: Erick Archer <erick.archer@xxxxxxx>
> > ---
> > Hi,
> >
> > This patch is a merger of two previous ones [1] [2].
> > As Hu Haowen and Jonathan Corbet suggested, the translation change
> > only makes sense if the original file is modified. So, with this
> > v2 version the original file and the translations are modified at
> > the same time.
> >
> > [1] 
> > https://lore.kernel.org/linux-hardening/20240120120527.3866-1-erick.archer@xxxxxxx/
> > [2] 
> > https://lore.kernel.org/linux-hardening/20240120122204.4287-1-erick.archer@xxxxxxx/
> >
> > Thanks,
> > Erick
> > ---
> >   Documentation/power/opp.rst                    | 2 +-
> >   Documentation/translations/zh_CN/power/opp.rst | 2 +-
> >   2 files changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/Documentation/power/opp.rst b/Documentation/power/opp.rst
> > index a7c03c470980..1b7f1d854f14 100644
> > --- a/Documentation/power/opp.rst
> > +++ b/Documentation/power/opp.rst
> > @@ -305,7 +305,7 @@ dev_pm_opp_get_opp_count
> >        {
> >           /* Do things */
> >           num_available = dev_pm_opp_get_opp_count(dev);
> > -        speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
> > +        speeds = kcalloc(num_available, sizeof(u32), GFP_KERNEL);
> >           /* populate the table in increasing order */
> >           freq = 0;
> >           while (!IS_ERR(opp = dev_pm_opp_find_freq_ceil(dev, &freq))) {
> > diff --git a/Documentation/translations/zh_CN/power/opp.rst 
> > b/Documentation/translations/zh_CN/power/opp.rst
> > index 8d6e3f6f6202..7470fa2d4c43 100644
> > --- a/Documentation/translations/zh_CN/power/opp.rst
> > +++ b/Documentation/translations/zh_CN/power/opp.rst
> > @@ -274,7 +274,7 @@ dev_pm_opp_get_opp_count
> >        {
> >           /* 做一些事情 */
> >           num_available = dev_pm_opp_get_opp_count(dev);
> > -        speeds = kzalloc(sizeof(u32) * num_available, GFP_KERNEL);
> > +        speeds = kcalloc(num_available, sizeof(u32), GFP_KERNEL);
>
>
> For the zh_CN translation,
>
> Reviewed-by: Hu Haowen <2023002089@xxxxxxxxxxxxxxxx>


Same here,

Reviewed-by: Yanteng Si <siyanteng@xxxxxxxxxxx>


Thanks,

Yanteng

> Thanks,
>
> Hu Haowen
>
>
> >           /* 按升序填充表 */
> >           freq = 0;
> >           while (!IS_ERR(opp = dev_pm_opp_find_freq_ceil(dev, &freq))) {
> > --
> > 2.25.1