linux-hardening - [PATCH][next] ASoC: Intel: Skylake: Replace zero-length arrays with DECLARE_FLEX

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Message-ID: <YzIuiUul2CwPlkKh@work>
Date:   Mon, 26 Sep 2022 17:58:17 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] ASoC: Intel: Skylake: Replace zero-length arrays with
 DECLARE_FLEX_ARRAY() helper

Zero-length arrays are deprecated and we are moving towards adopting
C99 flexible-array members, instead. So, replace zero-length arrays
declarations in anonymous union with the new DECLARE_FLEX_ARRAY()
helper macro.

This helper allows for flexible-array members in unions.

Link: https://github.com/KSPP/linux/issues/193
Link: https://github.com/KSPP/linux/issues/226
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 sound/soc/intel/skylake/skl-topology.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/intel/skylake/skl-topology.h b/sound/soc/intel/skylake/skl-topology.h
index a5bccf2fcd88..017ac0ef324d 100644
--- a/sound/soc/intel/skylake/skl-topology.h
+++ b/sound/soc/intel/skylake/skl-topology.h
@@ -233,8 +233,8 @@ struct skl_uuid_inst_map {
 struct skl_kpb_params {
 	u32 num_modules;
 	union {
-		struct skl_mod_inst_map map[0];
-		struct skl_uuid_inst_map map_uuid[0];
+		DECLARE_FLEX_ARRAY(struct skl_mod_inst_map, map);
+		DECLARE_FLEX_ARRAY(struct skl_uuid_inst_map, map_uuid);
 	} u;
 };
 
-- 
2.34.1