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Date:   Tue, 10 Aug 2021 16:07:41 -0500
From:   "Gustavo A. R. Silva" <>
To:     Don Brace <>,
        "James E.J. Bottomley" <>,
        "Martin K. Petersen" <>
        "Gustavo A. R. Silva" <>,
Subject: [PATCH][next] scsi: smartpqi: Replace one-element array with
 flexible-array member

There is a regular need in the kernel to provide a way to declare having
a dynamically sized set of trailing elements in a structure. Kernel code
should always use “flexible array members”[1] for these cases. The older
style of one-element or zero-length arrays should no longer be used[2].

Refactor the code a bit according to the use of a flexible-array member
in struct pqi_event_config instead of a one-element array, and use the
struct_size() helper.

This helps with the ongoing efforts to globally enable -Warray-bounds
and get us closer to being able to tighten the FORTIFY_SOURCE routines
on memcpy().

This issue was found with the help of Coccinelle and audited and fixed,


Signed-off-by: Gustavo A. R. Silva <>
 drivers/scsi/smartpqi/smartpqi.h      | 2 +-
 drivers/scsi/smartpqi/smartpqi_init.c | 3 +--
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index f340afc011b5..70eca203d72f 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -415,7 +415,7 @@ struct pqi_event_config {
 	u8	reserved[2];
 	u8	num_event_descriptors;
 	u8	reserved1;
-	struct pqi_event_descriptor descriptors[1];
+	struct pqi_event_descriptor descriptors[];
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index c1f0f8da9fe2..f9107127bd6e 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -4740,8 +4740,7 @@ static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info)
-	(offsetof(struct pqi_event_config, descriptors) + \
-	(PQI_MAX_EVENT_DESCRIPTORS * sizeof(struct pqi_event_descriptor)))
+	struct_size((struct pqi_event_config *)0, descriptors, PQI_MAX_EVENT_DESCRIPTORS)
 static int pqi_configure_events(struct pqi_ctrl_info *ctrl_info,
 	bool enable_events)

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