[riot-notifications] [RIOT-OS/RIOT] sys/oneway-malloc: only allocate word-aligned chunks (#15844)

benpicco notifications at github.com
Sun Jan 24 15:33:45 CET 2021

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Therefore, before describing what your contribution is about, we would like
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### Contribution description

If an unevenly sized allocation is requested, the next buffer handed out would start at an unaligned address.

Fix this by rounding up to the next word-sized allocation size.

### Testing procedure

Compile `tests/malloc` with

USEMODULE += oneway_malloc picolibc

(`oneway-malloc` is not compatible with newlib).

On `master` this will crash after the first allocation.
With this patch, allocations are performed as expected (and no deallocations) 

### Issues/PRs references

Examples: Fixes #1234. See also #5678. Depends on PR #9876.

Please use keywords (e.g., fixes, resolve) with the links to the issues you
resolved, this way they will be automatically closed when your pull request
is merged. See https://help.github.com/articles/closing-issues-using-keywords/.

You can view, comment on, or merge this pull request online at:


-- Commit Summary --

  * sys/oneway-malloc: only allocate word-aligned chunks

-- File Changes --

    M sys/oneway-malloc/oneway-malloc.c (10)

-- Patch Links --


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