dh_check.c: check BN_CTX_get's return value.

diff --git a/crypto/dh/dh_check.c b/crypto/dh/dh_check.c
index fa1df0efc05a10eeeab7257e43a5f3ad845040af..9c4f61329fc2652ea923c33a739c9f3f99ac6996 100644 (file)
--- a/crypto/dh/dh_check.c
+++ b/crypto/dh/dh_check.c
@@ -82,6 +82,7 @@ int DH_check(const DH *dh, int *ret)
        if (ctx == NULL) goto err;
        BN_CTX_start(ctx);
        t1=BN_CTX_get(ctx);
+       if (t1 == NULL) goto err;
        t2=BN_CTX_get(ctx);
        if (t2 == NULL) goto err;