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Date: Mon,  9 Oct 2023 09:10:35 -0700
From: Kees Cook <>
To: Christian Lamparter <>
Cc: Kees Cook <>,
	Kalle Valo <>,
	"Gustavo A. R. Silva" <>,,,
	Jason Andryuk <>,
	Nathan Chancellor <>,
	Nick Desaulniers <>,
	Tom Rix <>,,
Subject: [PATCH v2] wifi: p54: Annotate struct p54_cal_database with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family

Add __counted_by for struct p54_cal_database.

Cc: Christian Lamparter <>
Cc: Kalle Valo <>
Cc: "Gustavo A. R. Silva" <>
Suggested-by: Jason Andryuk <>
Signed-off-by: Kees Cook <>
v1 -
v2 - use the correct member (jandryuk)
 drivers/net/wireless/intersil/p54/p54.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/wireless/intersil/p54/p54.h b/drivers/net/wireless/intersil/p54/p54.h
index 3356ea708d81..522656de4159 100644
--- a/drivers/net/wireless/intersil/p54/p54.h
+++ b/drivers/net/wireless/intersil/p54/p54.h
@@ -126,7 +126,7 @@ struct p54_cal_database {
 	size_t entry_size;
 	size_t offset;
 	size_t len;
-	u8 data[];
+	u8 data[] __counted_by(len);
 #define EEPROM_READBACK_LEN 0x3fc

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