[v3,0/9] slab: provide and use krealloc_array()

Message

Bartosz Golaszewski Nov. 9, 2020, 11:06 a.m. UTC

From: Bartosz Golaszewski <[e-mail]>

Andy brought to my attention the fact that users allocating an array of
equally sized elements should check if the size multiplication doesn't
overflow. This is why we have helpers like kmalloc_array().

However we don't have krealloc_array() equivalent and there are many
users who do their own multiplication when calling krealloc() for arrays.

This series provides krealloc_array() and uses it in a couple places.

A separate series will follow adding devm_krealloc_array() which is
needed in the xilinx adc driver.

v1 -> v2:
- added a kernel doc for krealloc_array()
- mentioned krealloc et al in the docs
- collected review tags

v2 -> v3:
- add a patch improving krealloc()'s kerneldoc
- fix a typo
- improve .rst doc
- tweak line breaks

Bartosz Golaszewski (9):
  mm: slab: clarify krealloc()'s behavior with __GFP_ZERO
  mm: slab: provide krealloc_array()
  ALSA: pcm: use krealloc_array()
  vhost: vringh: use krealloc_array()
  pinctrl: use krealloc_array()
  edac: ghes: use krealloc_array()
  drm: atomic: use krealloc_array()
  hwtracing: intel: use krealloc_array()
  dma-buf: use krealloc_array()

 Documentation/core-api/memory-allocation.rst |  4 ++++
 drivers/dma-buf/sync_file.c                  |  3 +--
 drivers/edac/ghes_edac.c                     |  4 ++--
 drivers/gpu/drm/drm_atomic.c                 |  3 ++-
 drivers/hwtracing/intel_th/msu.c             |  2 +-
 drivers/pinctrl/pinctrl-utils.c              |  2 +-
 drivers/vhost/vringh.c                       |  3 ++-
 include/linux/slab.h                         | 18 ++++++++++++++++++
 mm/slab_common.c                             |  6 +++---
 sound/core/pcm_lib.c                         |  4 ++--
 10 files changed, 36 insertions(+), 13 deletions(-)