Fix null pointer check in pkey_dh_derive to ensure both keys are set

CLA: trivial

Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
Reviewed-by: Todd Short <todd.short@me.com>
(Merged from https://github.com/openssl/openssl/pull/28259)

(cherry picked from commit fc84d46d7227886152be00618889a521e9132ef3)

diff --git a/crypto/dh/dh_pmeth.c b/crypto/dh/dh_pmeth.c
index 3b75a537b3e0255f64b9c7b8398286ec597a6cf2..74bef9370d3a2fe0569a00e3399f6af93739de1c 100644 (file)
--- a/crypto/dh/dh_pmeth.c
+++ b/crypto/dh/dh_pmeth.c
@@ -408,7 +408,7 @@ static int pkey_dh_derive(EVP_PKEY_CTX *ctx, unsigned char *key,
     }
     dh = (DH *)EVP_PKEY_get0_DH(ctx->pkey);
     dhpub = EVP_PKEY_get0_DH(ctx->peerkey);
-    if (dhpub == NULL) {
+    if (dhpub == NULL || dh == NULL) {
         ERR_raise(ERR_LIB_DH, DH_R_KEYS_NOT_SET);
         return 0;
     }