Re: [PATCH] dmaengine: pxa_dma: Prefer struct_size over open coded arithmetic

[Gustavo A. R. Silva]

On Mon, Sep 20, 2021 at 07:00:58PM -0500, Gustavo A. R. Silva wrote:
> 
> 
> On 9/18/21 05:40, Len Baker 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, use the struct_size() helper to do the arithmetic instead of the
> > argument "size + count * size" in the kzalloc() function.
> > 
> > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
> > 
> > Signed-off-by: Len Baker <len.baker@xxxxxxx>
> 
> Reviewed-by: Gustavo A. R. Silva <gustavoars@xxxxxxxxxx>

I'm taking this in my -next tree.

Thanks
--
Gustavo