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kernel/gcov/gcc_3_4.c: use struct_size() in kzalloc()

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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;
      void *entry[];
  };

  instance = kzalloc(sizeof(struct foo) + sizeof(void *) * count, GFP_KERNEL);

Instead of leaving these open-coded and prone to type mistakes, we can
now use the new struct_size() helper:

  instance = kzalloc(struct_size(instance, entry, count), GFP_KERNEL);

This code was detected with the help of Coccinelle.

Link: http://lkml.kernel.org/r/20190109172445.GA15908@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Gustavo A. R. Silva 2019-03-07 16:29:47 -08:00 committed by Linus Torvalds
parent 32a5ad9c22
commit 9abdb50cda
1 changed files with 2 additions and 4 deletions
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6
kernel/gcov/gcc_3_4.c
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@ -245,8 +245,7 @@ struct gcov_info *gcov_info_dup(struct gcov_info *info)
/* Duplicate gcov_info. */
active = num_counter_active(info);
dup = kzalloc(sizeof(struct gcov_info) +
sizeof(struct gcov_ctr_info) * active, GFP_KERNEL);
dup = kzalloc(struct_size(dup, counts, active), GFP_KERNEL);
if (!dup)
return NULL;
dup->version = info->version;
@ -364,8 +363,7 @@ struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
{
struct gcov_iterator *iter;
iter = kzalloc(sizeof(struct gcov_iterator) +
num_counter_active(info) * sizeof(struct type_info),
iter = kzalloc(struct_size(iter, type_info, num_counter_active(info)),
GFP_KERNEL);
if (iter)
iter->info = info;