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Date: Thu, 6 Jun 2019 20:05:57 +0200 From: Jessica Yu <jeyu@...nel.org> To: "Gustavo A. R. Silva" <gustavo@...eddedor.com> Cc: linux-kernel@...r.kernel.org Subject: Re: [PATCH] kernel: module: Use struct_size() helper +++ Gustavo A. R. Silva [04/06/19 18:23 -0500]: >Make use of the struct_size() helper instead of an open-coded version >in order to avoid any potential type mistakes, in particular in the >context in which this code is being used. > >So, replace the following form: > >sizeof(*sect_attrs) + nloaded * sizeof(sect_attrs->attrs[0] > >with: > >struct_size(sect_attrs, attrs, nloaded) > >This code was detected with the help of Coccinelle. > >Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com> Hi Gustavo! I see you've sent similar cleanup patches elsewhere, do you think you could reword your commit message to be more similar to your patch here for instance: https://lkml.org/lkml/2019/6/5/856 It does a *much* better job of explaining the motivation and usage of struct_size(). Thank you! Jessica >--- > kernel/module.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > >diff --git a/kernel/module.c b/kernel/module.c >index 80c7c09584cf..3f3bb090fbf4 100644 >--- a/kernel/module.c >+++ b/kernel/module.c >@@ -1492,8 +1492,7 @@ static void add_sect_attrs(struct module *mod, const struct load_info *info) > for (i = 0; i < info->hdr->e_shnum; i++) > if (!sect_empty(&info->sechdrs[i])) > nloaded++; >- size[0] = ALIGN(sizeof(*sect_attrs) >- + nloaded * sizeof(sect_attrs->attrs[0]), >+ size[0] = ALIGN(struct_size(sect_attrs, attrs, nloaded), > sizeof(sect_attrs->grp.attrs[0])); > size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); > sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); >-- >2.21.0 >
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