[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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### 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
CFLAGS += -DCHUNK_SIZE=129
```

(`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

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

  https://github.com/RIOT-OS/RIOT/pull/15844

-- Commit Summary --

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

-- File Changes --

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

-- Patch Links --

https://github.com/RIOT-OS/RIOT/pull/15844.patch
https://github.com/RIOT-OS/RIOT/pull/15844.diff

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