Merge tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull overflow updates from Kees Cook:
 "This adds the new overflow checking helpers and adds them to the
  2-factor argument allocators. And this adds the saturating size
  helpers and does a treewide replacement for the struct_size() usage.
  Additionally this adds the overflow testing modules to make sure
  everything works.

  I'm still working on the treewide replacements for allocators with
  "simple" multiplied arguments:

     *alloc(a * b, ...) -> *alloc_array(a, b, ...)

  and

     *zalloc(a * b, ...) -> *calloc(a, b, ...)

  as well as the more complex cases, but that's separable from this
  portion of the series. I expect to have the rest sent before -rc1
  closes; there are a lot of messy cases to clean up.

  Summary:

   - Introduce arithmetic overflow test helper functions (Rasmus)

   - Use overflow helpers in 2-factor allocators (Kees, Rasmus)

   - Introduce overflow test module (Rasmus, Kees)

   - Introduce saturating size helper functions (Matthew, Kees)

   - Treewide use of struct_size() for allocators (Kees)"

* tag 'overflow-v4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  treewide: Use struct_size() for devm_kmalloc() and friends
  treewide: Use struct_size() for vmalloc()-family
  treewide: Use struct_size() for kmalloc()-family
  device: Use overflow helpers for devm_kmalloc()
  mm: Use overflow helpers in kvmalloc()
  mm: Use overflow helpers in kmalloc_array*()
  test_overflow: Add memory allocation overflow tests
  overflow.h: Add allocation size calculation helpers
  test_overflow: Report test failures
  test_overflow: macrofy some more, do more tests for free
  lib: add runtime test of check_*_overflow functions
  compiler.h: enable builtin overflow checkers and add fallback code

2 files changed, 3 insertions, 4 deletions

diff --git a/drivers/soc/actions/owl-sps.c b/drivers/soc/actions/owl-sps.c
index 8477f0f18e24..032921d8d41f 100644
--- a/drivers/soc/actions/owl-sps.c
+++ b/drivers/soc/actions/owl-sps.c
@@ -117,8 +117,8 @@ static int owl_sps_probe(struct platform_device *pdev)
 
 	sps_info = match->data;
 
-	sps = devm_kzalloc(&pdev->dev, sizeof(*sps) +
-			   sps_info->num_domains * sizeof(sps->domains[0]),
+	sps = devm_kzalloc(&pdev->dev,
+			   struct_size(sps, domains, sps_info->num_domains),
 			   GFP_KERNEL);
 	if (!sps)
 		return -ENOMEM;
diff --git a/drivers/soc/rockchip/pm_domains.c b/drivers/soc/rockchip/pm_domains.c
index 53efc386b1ad..111c44fc1c12 100644
--- a/drivers/soc/rockchip/pm_domains.c
+++ b/drivers/soc/rockchip/pm_domains.c
@@ -626,8 +626,7 @@ static int rockchip_pm_domain_probe(struct platform_device *pdev)
 	pmu_info = match->data;
 
 	pmu = devm_kzalloc(dev,
-			   sizeof(*pmu) +
-				pmu_info->num_domains * sizeof(pmu->domains[0]),
+			   struct_size(pmu, domains, pmu_info->num_domains),
 			   GFP_KERNEL);
 	if (!pmu)
 		return -ENOMEM;