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Date: Tue, 02 Nov 2021 09:44:57 +0000 From: David Howells <dhowells@...hat.com> To: Len Baker <len.baker@....com> Cc: dhowells@...hat.com, Marc Dionne <marc.dionne@...istor.com>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, Kees Cook <keescook@...omium.org>, linux-afs@...ts.infradead.org, linux-hardening@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH] afs: Prefer struct_size over open coded arithmetic Len Baker <len.baker@....com> 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 + size * count" 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@....com> Acked-by: David Howells <dhowells@...hat.com>
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