[riot-notifications] [RIOT-OS/RIOT] drivers/mtd: Prevent potential heap overflow (#16816)

Nils Ollrogge notifications at github.com
Mon Sep 6 16:06:29 CEST 2021

The RIOT community cares a lot about code quality.
Therefore, before describing what your contribution is about, we would like
you to make sure that your modifications are compliant with the RIOT
coding conventions, see https://github.com/RIOT-OS/RIOT/wiki/Coding-conventions.

### Contribution description
This PR adds a check to `drivers/mtd/mtd.c` to prevent  a heap overflow of the internal work buffer.
Additional it slightly improves the documentation in `mtd.h`.

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- describe which part(s) of RIOT is (are) involved
- if it's a bug fix, describe the bug that it solves and how it is solved
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### Testing procedure
A test was added to `tests/mtd_raw` to check if the potential heap overflow is handled correctly.

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- which test/example to compile for which board and is there a 'test' command
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-- Commit Summary --

  * drivers/mtd: add check for heap overflow, improve documentation
  * drivers/mtd: uncrustify files

-- File Changes --

    M drivers/include/mtd.h (32)
    M drivers/mtd/mtd.c (41)
    M tests/mtd_raw/main.c (58)

-- Patch Links --


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