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Subject[PATCH] driver core: platform: Annotate struct irq_affinity_devres with __counted_by
Date
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
functions).

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

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: linux-hardening@vger.kernel.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook@chromium.org>
---
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)
--
2.34.1
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