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[6/7] IB/mthca: Annotate struct mthca_icm_table with __counted_by

Message ID 20230929180431.3005464-6-keescook@chromium.org (mailing list archive)
State Mainlined
Commit 2aba54a9e0ead531f7fd35f312239788a435a4f5
Headers show
Series RDMA: Annotate structs with __counted_by | expand

Commit Message

Kees Cook Sept. 29, 2023, 6:04 p.m. UTC 
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 mthca_icm_table.

[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: linux-rdma@vger.kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>
---
 drivers/infiniband/hw/mthca/mthca_memfree.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/infiniband/hw/mthca/mthca_memfree.h b/drivers/infiniband/hw/mthca/mthca_memfree.h
index f9a2e65e2ff5..61d5bbba293a 100644
--- a/drivers/infiniband/hw/mthca/mthca_memfree.h
+++ b/drivers/infiniband/hw/mthca/mthca_memfree.h
@@ -68,7 +68,7 @@  struct mthca_icm_table {
 	int               lowmem;
 	int               coherent;
 	struct mutex      mutex;
-	struct mthca_icm *icm[];
+	struct mthca_icm *icm[] __counted_by(num_icm);
 };
 
 struct mthca_icm_iter {