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Message-Id: <20190208.225820.1267799543305280077.davem@davemloft.net> Date: Fri, 08 Feb 2019 22:58:20 -0800 (PST) From: David Miller <davem@...emloft.net> To: gustavo@...eddedor.com Cc: khc@...waw.pl, netdev@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH net-next] wan: wanxl: use struct_size() in kzalloc() From: "Gustavo A. R. Silva" <gustavo@...eddedor.com> Date: Thu, 7 Feb 2019 21:16:48 -0600 > One of the more common cases of allocation size calculations is finding > the size of a structure that has a zero-sized array at the end, along > with memory for some number of elements for that array. For example: > > struct foo { > int stuff; > struct boo entry[]; > }; > > size = sizeof(struct foo) + count * sizeof(struct boo); > instance = alloc(size, GFP_KERNEL) > > Instead of leaving these open-coded and prone to type mistakes, we can > now use the new struct_size() helper: > > instance = alloc(struct_size(instance, entry, count), GFP_KERNEL) > > Notice that, in this case, variable alloc_size is not necessary, hence > it is removed. > > This code was detected with the help of Coccinelle. > > Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com> Applied.
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