pkey_gost_ctrl: check for NULL after allocating pctx->shared_ukm

Signed-off-by: NKurt Roeckx <kurt@roeckx.be>
Reviewed-by: NRichard Levitte <levitte@openssl.org>

engines/ccgost/gost_pmeth.c

@@ -106,6 +106,11 @@ static int pkey_gost_ctrl(EVP_PKEY_CTX *ctx, int type, int p1, void *p2)
 			return 1;
 		case EVP_PKEY_CTRL_SET_IV:
 			pctx->shared_ukm=OPENSSL_malloc((int)p1);
+			if (pctx->shared_ukm == NULL)
+				{
+				GOSTerr(GOST_F_PKEY_GOST_CTRL, ERR_R_MALLOC_FAILURE);
+				return 0;
+				}
 			memcpy(pctx->shared_ukm,p2,(int) p1);
 			return 1;
 		case EVP_PKEY_CTRL_PEER_KEY: