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Subject[PATCH 2/7] RDMA/core: Annotate struct ib_pkey_cache 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 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 ib_pkey_cache.

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

Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Leon Romanovsky <leon@kernel.org>
Cc: "Håkon Bugge" <haakon.bugge@oracle.com>
Cc: Avihai Horon <avihaih@nvidia.com>
Cc: Anand Khoje <anand.a.khoje@oracle.com>
Cc: Mark Bloch <mbloch@nvidia.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/infiniband/core/cache.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/cache.c b/drivers/infiniband/core/cache.c
index 7acc0f936dad..c02a96d3572a 100644
--- a/drivers/infiniband/core/cache.c
+++ b/drivers/infiniband/core/cache.c
@@ -46,7 +46,7 @@

struct ib_pkey_cache {
int table_len;
- u16 table[];
+ u16 table[] __counted_by(table_len);
};

struct ib_update_work {
--
2.34.1
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