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Date: Fri,  6 Oct 2023 13:17:49 -0700
From: Kees Cook <>
To: Greg Kroah-Hartman <>
Cc: Kees Cook <>,
	"Rafael J. Wysocki" <>,
	"Gustavo A. R. Silva" <>,,
	Nathan Chancellor <>,
	Nick Desaulniers <>,
	Tom Rix <>,,
Subject: [PATCH] driver core: platform: Annotate struct irq_affinity_devres 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

As found with Coccinelle[1], add __counted_by for struct

Cc: Greg Kroah-Hartman <>
Cc: "Rafael J. Wysocki" <>
Cc: "Gustavo A. R. Silva" <>
Link: [1]
Signed-off-by: Kees Cook <>
 drivers/base/platform.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 76bfcba25003..07216889d3ba 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -291,7 +291,7 @@ EXPORT_SYMBOL_GPL(platform_irq_count);
 struct irq_affinity_devres {
 	unsigned int count;
-	unsigned int irq[];
+	unsigned int irq[] __counted_by(count);
 static void platform_disable_acpi_irq(struct platform_device *pdev, int index)

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