Don't ignore return value of EVP_DigestInit_ex() in md BIOs and dgst utility.

apps/dgst.c

@@ -332,7 +332,13 @@ int MAIN(int argc, char **argv)
 
 
 	/* we use md as a filter, reading from 'in' */
-	BIO_set_md(bmd,md);
+	if (!BIO_set_md(bmd,md))
+		{
+		BIO_printf(bio_err, "Error setting digest %s\n", pname);
+		ERR_print_errors(bio_err);
+		goto end;
+		}
+		
 	inp=BIO_push(bmd,in);
 
 	if (argc == 0)

crypto/evp/bio_md.c

@@ -176,9 +176,10 @@ static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
 		{
 	case BIO_CTRL_RESET:
 		if (b->init)
-			EVP_DigestInit_ex(ctx,ctx->digest, NULL);
+			ret = EVP_DigestInit_ex(ctx,ctx->digest, NULL);
 		else
 			ret=0;
+		if (ret > 0)
 			ret=BIO_ctrl(b->next_bio,cmd,num,ptr);
 		break;
 	case BIO_C_GET_MD:
@@ -207,7 +208,8 @@ static long md_ctrl(BIO *b, int cmd, long num, void *ptr)
 
 	case BIO_C_SET_MD:
 		md=ptr;
-		EVP_DigestInit_ex(ctx,md, NULL);
+		ret = EVP_DigestInit_ex(ctx,md, NULL);
+		if (ret > 0)
 			b->init=1;
 		break;
 	case BIO_CTRL_DUP: