[PATCH v2 0/3] staging: media: atomisp: use kvmalloc_objs() and drop redundant OOM messages

[Rodrigo Gobbi]

Several allocations in the atomisp driver still size their buffers with
open-coded multiplication, e.g. width * height * sizeof(*p). When the
dimensions are large the product can silently wrap, causing kvmalloc()
to allocate an undersized buffer.

Convert the remaining sites to kvmalloc_objs() with array_size(), which
saturate to SIZE_MAX on overflow so kvmalloc() returns NULL instead of
allocating too few bytes.

This continues the work started in commit [2], and picks up the stalled
sites from [1], unifying with [3].

While here, drop the redundant IA_CSS_ERROR("out of memory") messages on
the touched allocation paths: the memory management core already emits a
far more detailed warning on allocation failure as raised at [1].

[1] https://lore.kernel.org/all/20260413112904.98864-1-feng@xxxxxxxxx/
[2] https://github.com/torvalds/linux/commit/d178c7ca8fefc28115d35b94c3b1f4d653e34182
[3] https://lore.kernel.org/all/20260609215110.118860-1-rodrigo.gobbi.7@xxxxxxxxx/
---
Hi, all,
Regarding a comment from Andy at [3]:
> From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
> On Tue, Jun 09, 2026 at 06:46:31PM -0300, Rodrigo Gobbi wrote:
> Replace kvmalloc() with multiply with kvmalloc_objs(), which handles
> the size multiplication internally with overflow checking, silenting
> checkpatch warn.
> 
> Signed-off-by: Rodrigo Gobbi <rodrigo.gobbi.7@xxxxxxxxx>
> ---
> Hi, all,
> There is a ongoing effort like this for other files from atomisp
> at [1], yet, it is not covering the same file.
> Tks and regards.
> 
> [1] https://lore.kernel.org/all/20260413112904.98864-1-feng@xxxxxxxxx/

> Yeah, the problem is that the activity seems stale. Can you pickup all
> the patches from the mailing list that have not been yet applied (regarding
> k*alloc() uses) and combine them into series or so and update regarding to
> Sakari's comments?
The only patches that I found from stale threads were added in this series,
hope that is fine now.
Tks and regards.

Changelog:
v2: convert to a series with additional stale patches;
v1: https://lore.kernel.org/all/20260609215110.118860-1-rodrigo.gobbi.7@xxxxxxxxx/
---
Rodrigo Gobbi (3):
  staging: media: atomisp: use kvmalloc_objs() in make_histogram()
  staging: media: atomisp: use kvmalloc_objs() for overflow-safe
    allocation
  staging: media: atomisp: drop redundant out-of-memory messages

 .../media/atomisp/pci/sh_css_metrics.c        |  11 +-
 .../media/atomisp/pci/sh_css_param_dvs.c      |   5 -
 .../staging/media/atomisp/pci/sh_css_params.c | 101 +++++++-----------
 3 files changed, 41 insertions(+), 76 deletions(-)

-- 
2.48.1