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scsi: smartpqi: Replace one-element array with flexible-array member

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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,
manually.

[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays

Link: https://github.com/KSPP/linux/issues/79
Link: https://github.com/KSPP/linux/issues/109
Link: https://lore.kernel.org/r/20210810210741.GA58765@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Gustavo A. R. Silva 2021-08-10 16:07:41 -05:00 committed by Martin K. Petersen
parent 0f99792c01
commit 5f492a7aa1
2 changed files with 2 additions and 3 deletions
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2
drivers/scsi/smartpqi/smartpqi.h
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@ -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[];
};
#define PQI_MAX_EVENT_DESCRIPTORS 255

3
drivers/scsi/smartpqi/smartpqi_init.c
View file

@ -4741,8 +4741,7 @@ static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info)
}
#define PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH \
(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)