linux-hardening - [PATCH][next] ASoC: uapi: Replace zero-length arrays with __DECLARE_FLEX

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Date:   Mon, 26 Sep 2022 18:18:42 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     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: uapi: 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/227
Link: https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 include/uapi/sound/asoc.h | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/uapi/sound/asoc.h b/include/uapi/sound/asoc.h
index 053949287ce8..dd8ad790fc15 100644
--- a/include/uapi/sound/asoc.h
+++ b/include/uapi/sound/asoc.h
@@ -226,9 +226,9 @@ struct snd_soc_tplg_vendor_array {
 	__le32 type;	/* SND_SOC_TPLG_TUPLE_TYPE_ */
 	__le32 num_elems;	/* number of elements in array */
 	union {
-		struct snd_soc_tplg_vendor_uuid_elem uuid[0];
-		struct snd_soc_tplg_vendor_value_elem value[0];
-		struct snd_soc_tplg_vendor_string_elem string[0];
+		__DECLARE_FLEX_ARRAY(struct snd_soc_tplg_vendor_uuid_elem, uuid);
+		__DECLARE_FLEX_ARRAY(struct snd_soc_tplg_vendor_value_elem, value);
+		__DECLARE_FLEX_ARRAY(struct snd_soc_tplg_vendor_string_elem, string);
 	};
 } __attribute__((packed));
 
-- 
2.34.1