linux-hardening - [PATCH] ASoC: cs-amp-lib: Annotate struct cirrus_amp_efi_data with __counted

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Message-ID: <20250415090354.92211-2-thorsten.blum@linux.dev>
Date: Tue, 15 Apr 2025 11:03:55 +0200
From: Thorsten Blum <thorsten.blum@...ux.dev>
To: David Rhodes <david.rhodes@...rus.com>,
	Richard Fitzgerald <rf@...nsource.cirrus.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Kees Cook <kees@...nel.org>,
	"Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Thorsten Blum <thorsten.blum@...ux.dev>,
	linux-sound@...r.kernel.org,
	patches@...nsource.cirrus.com,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] ASoC: cs-amp-lib: Annotate struct cirrus_amp_efi_data with __counted_by()

Add the __counted_by() compiler attribute to the flexible array member
'data' to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

No functional changes intended.

Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>
---
 include/sound/cs-amp-lib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/sound/cs-amp-lib.h b/include/sound/cs-amp-lib.h
index f481148735e1..5459c221badf 100644
--- a/include/sound/cs-amp-lib.h
+++ b/include/sound/cs-amp-lib.h
@@ -23,7 +23,7 @@ struct cirrus_amp_cal_data {
 struct cirrus_amp_efi_data {
 	u32 size;
 	u32 count;
-	struct cirrus_amp_cal_data data[];
+	struct cirrus_amp_cal_data data[] __counted_by(count);
 } __packed;
 
 /**
-- 
2.49.0