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mailbox: zynqmp: Annotate struct zynqmp_ipi_pdata 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 checking 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 zynqmp_ipi_pdata.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Jassi Brar <jassisinghbrar@gmail.com>
Cc: Michal Simek <michal.simek@amd.com>
Cc: linux-arm-kernel@lists.infradead.org
Reviewed-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Acked-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/20230922175351.work.018-kees@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

Kees Cook c5225cd0 86748637

+1 -1
+1 -1
drivers/mailbox/zynqmp-ipi-mailbox.c
··· 108 108 unsigned int method; 109 109 u32 local_id; 110 110 int num_mboxes; 111 - struct zynqmp_ipi_mbox ipi_mboxes[]; 111 + struct zynqmp_ipi_mbox ipi_mboxes[] __counted_by(num_mboxes); 112 112 }; 113 113 114 114 static struct device_driver zynqmp_ipi_mbox_driver = {