From patchwork Thu Jun 20 18:17:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yabin Cui X-Patchwork-Id: 13706238 X-Patchwork-Delegate: kuba@kernel.org Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 57873376F5 for ; Thu, 20 Jun 2024 18:17:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718907461; cv=none; b=JnKJI4FJLWN/ytMwCtNU5rgHqtaDwhLX5fC6T2Bm+9+jrbrVuPDc+G3INbewiPtKgzgsizOXYER1hjuqcRlC4DT1i4rc+xtdhStHRbT+fgPTrUUIyEY5KXKkz9/IoR2WiSM6+OiRy97pQGgVqsHCv3GxVvKb681GO/Y7Q5XkBus= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718907461; c=relaxed/simple; bh=iY15znjKwXj/mYMfmF3+a0bhsiOgCwhdhV8LAVnf6/I=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=ValYHQjiH/1Zl35dcHCdPRvh46q2Ge/XQDRiUCof5y0XIQ9sC14kDf80HaDSnK5ozo2c3x/NV1soWPUZYBz/ZmhAReqTU/Tq7OuE0RG6Rx0P9GlSA2zM0A7reactaIdnajV+P6Ad9iscS0Mqjr2ypTzmZCTCfCgxWRcw8RUh3DU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--yabinc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=v9QoiZzN; arc=none smtp.client-ip=209.85.128.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--yabinc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="v9QoiZzN" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-63bf44b87d4so15315297b3.0 for ; Thu, 20 Jun 2024 11:17:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1718907459; x=1719512259; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=txPbdh0UwgPW6j6zme2yNhfuJXXQO0kUOBEsBGdoZYA=; b=v9QoiZzN57lzQJCCCfz0AOWbSagaDStYUvrR1H4TY4PoItcKCswu7i0v82fFrV+AwM KmxP9NcCkIrXh+S7BkKvZKoefo7YXjYb3TSmdo6tXCPYJAOYxfYUMxwJMbuBsXq6ubi8 T8cGcabCqejs4nwlevAMGsMC0DQ3ublsil0RQnBPuYkloi9GKLSBCvI2YjFz+rUHxkLJ HvNueihGWB9nI8OOOe3M+M/XTKHwVBxZWgYDS/XbrRPhVA5Ji/ji6T5omniT3Ql5D7o3 S+5tmlQVcSM6FiFN7/q1k++sqtenTSgEPJUY75I+p2RmIOzsxUN7jbRTD3fe3zXa4IIz DjoA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1718907459; x=1719512259; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=txPbdh0UwgPW6j6zme2yNhfuJXXQO0kUOBEsBGdoZYA=; b=QXfnZSXOEUHw7ewc4QP5jXIRw+p+GtCCFwtwKKuHUuvX/743xQwUM63q7uYf0QDhEw FYxWXY3JEOt619jPq+5OI2Fr+qLdY6eZEK8YlYBo52qR4lGEKfkZ2xjdEc+iVrZ5mjzV sfoD8R4BQcsJIi0logZ9szRbGL4sOkzgQK5C16UZ/tsUJHdmqVziZr4gGhw0o2ut6jd2 CS19EqRBlmbzeUCafekhXcVKOdgaNkgRdDwB32qx0i8sfmRC2qBY2AfKfgw1API7lEuz vWVJDC8a3iT02ORs92WmGAq/9v+X30PXbz+sF34yQPnnx+NkL9QlCFKc35+FzslkR81e ddWQ== X-Gm-Message-State: AOJu0YyM1ThChIEyDkn9y4a44eWAPCeGPXKbplKPRHRw1ndGJSYQ6peD LHIeY4YWYQ4YJnAoH16y8apcMIJKgNqnX1QzWNAvvp5teLgpH4KPmF8Ndm25+oAskZ8cy0SgaWk L X-Google-Smtp-Source: AGHT+IF8GVDMyvGZpRp4boOIOSvfLSv3xxNhz/7qXqDIgZdXB8RVhwD0g/1O17E1anqM5aheujLEfMzdr1M= X-Received: from yabinc-desktop.mtv.corp.google.com ([2620:15c:211:202:6cd4:2b82:abfb:6e47]) (user=yabinc job=sendgmr) by 2002:a05:690c:30a:b0:620:32ea:e1d4 with SMTP id 00721157ae682-63a84340c6dmr12853057b3.0.1718907459308; Thu, 20 Jun 2024 11:17:39 -0700 (PDT) Date: Thu, 20 Jun 2024 11:17:36 -0700 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.45.2.741.gdbec12cfda-goog Message-ID: <20240620181736.1270455-1-yabinc@google.com> Subject: [PATCH] Fix initializing a static union variable From: Yabin Cui To: Steffen Klassert , Herbert Xu , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, Yabin Cui X-Patchwork-Delegate: kuba@kernel.org saddr_wildcard is a static union variable initialized with {}. But c11 standard doesn't guarantee initializing all fields as zero for this case. As in https://godbolt.org/z/rWvdv6aEx, clang only initializes the first field as zero, but the bits corresponding to other (larger) members are undefined. Signed-off-by: Yabin Cui --- net/xfrm/xfrm_state.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 649bb739df0d..9bc69d703e5c 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c @@ -1139,7 +1139,7 @@ xfrm_state_find(const xfrm_address_t *daddr, const xfrm_address_t *saddr, struct xfrm_policy *pol, int *err, unsigned short family, u32 if_id) { - static xfrm_address_t saddr_wildcard = { }; + static const xfrm_address_t saddr_wildcard; struct net *net = xp_net(pol); unsigned int h, h_wildcard; struct xfrm_state *x, *x0, *to_put;