[openssl/openssl] 17098c: Make the DRBG seed propagation thread safe

[bernd-edlinger]

  Branch: refs/heads/OpenSSL_1_1_1-stable
  Home:   https://github.openssl.org/openssl/openssl
  Commit: 17098c116d68b3a01fcb688487dccdc0c10b8f63
      https://github.openssl.org/openssl/openssl/commit/17098c116d68b3a01fcb688487dccdc0c10b8f63
  Author: Bernd Edlinger <bernd.edlinger at hotmail.de>
  Date:   2022-07-09 (Sat, 09 Jul 2022)

  Changed paths:
    M crypto/rand/drbg_lib.c
    M crypto/rand/rand_lib.c

  Log Message:
  -----------
  Make the DRBG seed propagation thread safe

Currently there is a race possible because the reseed_counter
of the master drbg may be incremented after the get_entropy call.
Therefore access the parent's reseed_counter while still holding
the rand_drbg_lock.

This improves commit 958fec77928a28350f6af252ac5e8d0e6e081faa

Reviewed-by: Paul Dale <pauli at openssl.org>
Reviewed-by: Tomas Mraz <tomas at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16900)