[PATCH v3 0/3] Fixes and rework for aes_s390

Fix and rework some issues around arch/s390/aes_s390.c:

- Fix skcipher_walk return code handling in aes_s390
- Add scrub of some temp buffers
- Rework AES CTR to be prepared for context analysis

For more details please see patch headers.

Changelog:

v1: initial version
v2: Fix missing scrub on a temp buffer used to process left over bytes
    in CTR mode.
v3: - Yet another buffer scrubbing was missing. Added to the 2nd 
      patch and rephrased commit header.
    - Added patch to fix one warning with context analysis regarding
      the handling of a mutex with the AES CTR implementation.
v4: - Sashiko found two unscrubbed buffers in two variables in the GCM
      implementation. So handle them with memzero_explicit().
    - Added one condition to check for the CTR algorithm to invoke
      mutex_trylock() only in non-interrupt and non-atomic
      context (which comes down to process context only).

Harald Freudenberger (3):
  s390/crypto: Fix skcipher_walk return code handling in aes_s390
  s390/crypto: Fix missing scrub of temp buffers with AES ctr and gcm
    algorithm
  s390/crypto: Rewrite AES ctr mode to be prepared for context analysis

 arch/s390/crypto/aes_s390.c | 84 ++++++++++++++++++++++++-------------
 1 file changed, 54 insertions(+), 30 deletions(-)


base-commit: f5098b6bae761e346ebcd9da7f95622c04733cff
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2.43.0