[PATCH] nvmet-fc: Annotate struct nvmet_fc_tgt_queue with __counted_by

[Kees Cook]

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 nvmet_fc_tgt_queue.

Cc: James Smart <james.smart at broadcom.com>
Cc: Christoph Hellwig <hch at lst.de>
Cc: Sagi Grimberg <sagi at grimberg.me>
Cc: Chaitanya Kulkarni <kch at nvidia.com>
Cc: linux-nvme at lists.infradead.org
Link: https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci [1]
Signed-off-by: Kees Cook <keescook at chromium.org>
---
 drivers/nvme/target/fc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 1ab6601fdd5c..0fa2d658cdeb 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -146,7 +146,7 @@ struct nvmet_fc_tgt_queue {
 	struct workqueue_struct		*work_q;
 	struct kref			ref;
 	struct rcu_head			rcu;
-	struct nvmet_fc_fcp_iod		fod[];		/* array of fcp_iods */
+	struct nvmet_fc_fcp_iod		fod[] __counted_by(sqsize); /* array of fcp_iods */
 } __aligned(sizeof(unsigned long long));
 
 struct nvmet_fc_hostport {
-- 
2.34.1