On Sat, Jan 20, 2024 at 01:05:27PM +0100, Erick Archer wrote:
> 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.
>
> 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 <[email protected]>
Hi,
Drop this patch as a new version has been sent to change at the
same time the translations.
Thanks,
Erick
> ---
> Documentation/power/opp.rst | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> 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))) {
> --
> 2.25.1
>
