[openssl/openssl] a21f77: crypto/evp: fix double free of tmp_keymgmt in sig/...

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: a21f77dbc99c242b73b5b420714a2cd36bee084a
      https://github.com/openssl/openssl/commit/a21f77dbc99c242b73b5b420714a2cd36bee084a
  Author: rootvector2 <[email protected]>
  Date:   2026-05-31 (Sun, 31 May 2026)

  Changed paths:
    M crypto/evp/asymcipher.c
    M crypto/evp/kem.c
    M crypto/evp/signature.c

  Log Message:
  -----------
  crypto/evp: fix double free of tmp_keymgmt in sig/kem/asym init

Commit ecb4757b377f "crypto/evp/m_sigver.c: fix potential double free
on error path in do_sigver_init" has fixed double-free of tmp_keymgmt
in do_sigver_init() by setting it to NULL after EVP_KEYMGMT_free() call;
the same issue present in evp_kem_init(), evp_pkey_asym_cipher_init(),
and evp_pkey_signature_init().  Address it similarly, by setting
the pointers to NULL after *_free() calls.

Complements: ecb4757b377f "crypto/evp/m_sigver.c: fix potential double free on error path in do_sigver_init"
Fixes: 839ffdd11cd4 "EVP: Allow a fallback for operations that work with an EVP_PKEY"
CLA: trivial

Reviewed-by: Kurt Roeckx <[email protected]>
Reviewed-by: Tomas Mraz <[email protected]>
Reviewed-by: Eugene Syromiatnikov <[email protected]>
MergeDate: Sun May 31 11:03:15 2026
(Merged from https://github.com/openssl/openssl/pull/31312)



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