Crypto/evp: Fix null pointer dereference

Check the return value of EVP_KDF_fetch to avoid a potential null pointer dereference. Reviewed-by: Tomas Mraz <tomas@openssl.org> Reviewed-by: Paul Dale <pauli@openssl.org> (Merged from openssl#18062)
Lamoracke1 · Apr 11, 2022 · 5f1424c · 5f1424c
1 parent 148176c
commit 5f1424c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/crypto/evp/p5_crpt2.c b/crypto/evp/p5_crpt2.c
@@ -42,6 +42,8 @@ int ossl_pkcs5_pbkdf2_hmac_ex(const char *pass, int passlen,
         salt = (unsigned char *)empty;
 
     kdf = EVP_KDF_fetch(libctx, OSSL_KDF_NAME_PBKDF2, propq);
+    if (kdf == NULL)
+         return 0;
     kctx = EVP_KDF_CTX_new(kdf);
     EVP_KDF_free(kdf);
     if (kctx == NULL)