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Date: Thu,  5 Oct 2023 09:14:12 -0700
From: Kees Cook <>
To: James Smart <>
Cc: Kees Cook <>,
	Christoph Hellwig <>,
	Sagi Grimberg <>,,
	"Gustavo A . R . Silva" <>,
	Chaitanya Kulkarni <>,
	Nathan Chancellor <>,
	Nick Desaulniers <>,
	Tom Rix <>,,,
Subject: [PATCH v2] nvmet-fc: Annotate struct nvmet_fc_tgt_queue 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 via CONFIG_UBSAN_BOUNDS (for
array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family

As found with Coccinelle[1], add __counted_by for struct
nvmet_fc_tgt_queue. Additionally, since the element count member must
be set before accessing the annotated flexible array member, move its
initialization earlier.

Cc: James Smart <>
Cc: Christoph Hellwig <>
Cc: Sagi Grimberg <>
Reviewed-by: Gustavo A. R. Silva <>
Reviewed-by: Chaitanya Kulkarni <>
Link: [1]
Signed-off-by: Kees Cook <>
 - move comment to line above (hch)
 - add reviewed-bys
 drivers/nvme/target/fc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 1ab6601fdd5c..bd59990b5250 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -146,7 +146,8 @@ 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 */
+	/* array of fcp_iods */
+	struct nvmet_fc_fcp_iod		fod[] __counted_by(sqsize);
 } __aligned(sizeof(unsigned long long));
 struct nvmet_fc_hostport {

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