[openssl/openssl] 7638f4: kdfs/hmacdrbg_kdf.c: Add checks for the EVP_MD_get...

[JiashengJiang]

  Branch: refs/heads/master
  Home:   https://github.com/openssl/openssl
  Commit: 7638f4016a9438dccaf183a3ae7353d363dfc25a
      https://github.com/openssl/openssl/commit/7638f4016a9438dccaf183a3ae7353d363dfc25a
  Author: Jiasheng Jiang <jiasheng at purdue.edu>
  Date:   2024-04-01 (Mon, 01 Apr 2024)

  Changed paths:
    M providers/implementations/kdfs/hmacdrbg_kdf.c

  Log Message:
  -----------
  kdfs/hmacdrbg_kdf.c: Add checks for the EVP_MD_get_size()

Add checks for the EVP_MD_get_size() to avoid integer overflow and then explicitly cast from int to size_t.

Fixes: f3090fc710 ("Implement deterministic ECDSA sign (RFC6979)")
Signed-off-by: Jiasheng Jiang <jiasheng at purdue.edu>

Reviewed-by: Tomas Mraz <tomas at openssl.org>
Reviewed-by: Paul Dale <ppzgs1 at gmail.com>
Reviewed-by: Tom Cosgrove <tom.cosgrove at arm.com>
Reviewed-by: Neil Horman <nhorman at openssl.org>
(Merged from https://github.com/openssl/openssl/pull/23950)



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