On Wed, 3 Oct 2018, Vladis Dronov wrote:

This patchset is fixing some aspects of the ring buffer implementation in
drivers/hid/hid-debug.c. This implementation has certain problem points:

- it may stuck in an infinite loop
- it may return corrupted data
- a reader and a writer are not protected by spinlocks, which can lead to
  the corrupted data

The suggested patchset is a new ring buffer implementation which overwrites
the oldest data in case of an overflow. One can verify the suggested ring
buffer implementation by fuzzing it with modified kernel and fuzzer-reader
at: https://gist.github.com/nefigtut/33d56e3870b67493cc867344aed2a062

Vladis,

thanks for cleaning it up. I actually like your rewrite quite a lot.

Quick question -- how well was it tested in which scenarios?

-- 
Jiri Kosina
SUSE Labs