[OpenSIPS-Devel] [OpenSIPS/opensips] 66cca0: tls_openssl: fix per-thread state double-free acro...

[Norm Brandinger]

  Branch: refs/heads/3.6
  Home:   https://github.com/OpenSIPS/opensips
  Commit: 66cca03849dc30193cf7b1dfe026ce6f4210609a
      https://github.com/OpenSIPS/opensips/commit/66cca03849dc30193cf7b1dfe026ce6f4210609a
  Author: Norm Brandinger <n.brandinger at gmail.com>
  Date:   2026-04-24 (Fri, 24 Apr 2026)

  Changed paths:
    M modules/tls_openssl/openssl.c

  Log Message:
  -----------
  tls_openssl: fix per-thread state double-free across fork()

Register a pthread_atfork prepare handler that calls OPENSSL_thread_stop()
before each fork().  CRYPTO_set_mem_functions() routes all OpenSSL allocations
to shared memory, but per-thread structures (ERR_STATE, DRBG) use thread-local
storage pointers inherited across fork().  Without cleanup, child processes
inherit a stale pointer to the parent per-thread state; if the parent frees or
re-creates that state, the child next OpenSSL call triggers a double-free
(detected by QM_MALLOC_DBG as SIGABRT).

After OPENSSL_thread_stop() the thread-local pointer is NULL.  Both parent and
child lazily allocate fresh per-thread state on the next OpenSSL call.

This complements the existing on_exit(_exit) handler which covers the same
class of double-free at process exit time.

(cherry picked from commit c8d148c1ea0b018964dc24cfce01ac0cf3e8940e)



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