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author | Gustavo A. R. Silva <gustavo@embeddedor.com> | 2020-02-24 10:14:06 -0600 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-03-11 23:07:56 -0400 |
commit | 5febf6d6ae4d488a5dc388c46d96c17f9556238f (patch) | |
tree | 220cb44bf3d7792bc6460d43b06e9a90506d1869 /drivers/scsi | |
parent | 5905d4648e7ec2cc9316b17290f21e8bd8a78c32 (diff) | |
download | linux-5febf6d6ae4d488a5dc388c46d96c17f9556238f.tar.gz linux-5febf6d6ae4d488a5dc388c46d96c17f9556238f.tar.bz2 linux-5febf6d6ae4d488a5dc388c46d96c17f9556238f.zip |
scsi: Replace zero-length array with flexible-array member
The current codebase makes use of the zero-length array language extension
to the C90 standard, but the preferred mechanism to declare variable-length
types such as these ones is a flexible array member[1][2], introduced in
C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning in
case the flexible array does not occur last in the structure, which will
help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by this
change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lore.kernel.org/r/20200224161406.GA21454@embeddedor
Reviewed-by: Lee Duncan <lduncan@suse.com>
Reviewed-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r-- | drivers/scsi/fnic/vnic_devcmd.h | 2 | ||||
-rw-r--r-- | drivers/scsi/ipr.h | 6 | ||||
-rw-r--r-- | drivers/scsi/isci/sas.h | 2 | ||||
-rw-r--r-- | drivers/scsi/mpt3sas/mpt3sas_scsih.c | 2 | ||||
-rw-r--r-- | drivers/scsi/mvsas/mv_sas.h | 2 | ||||
-rw-r--r-- | drivers/scsi/mvumi.h | 4 | ||||
-rw-r--r-- | drivers/scsi/pmcraid.h | 2 | ||||
-rw-r--r-- | drivers/scsi/snic/vnic_devcmd.h | 2 | ||||
-rw-r--r-- | drivers/scsi/stex.c | 2 |
9 files changed, 12 insertions, 12 deletions
diff --git a/drivers/scsi/fnic/vnic_devcmd.h b/drivers/scsi/fnic/vnic_devcmd.h index c5dde556dc7c..c20d30e36dfc 100644 --- a/drivers/scsi/fnic/vnic_devcmd.h +++ b/drivers/scsi/fnic/vnic_devcmd.h @@ -442,7 +442,7 @@ struct vnic_devcmd_notify { struct vnic_devcmd_provinfo { u8 oui[3]; u8 type; - u8 data[0]; + u8 data[]; }; /* diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h index a67baeb36d1f..fd3929a19ab5 100644 --- a/drivers/scsi/ipr.h +++ b/drivers/scsi/ipr.h @@ -451,12 +451,12 @@ struct ipr_config_table_hdr64 { struct ipr_config_table { struct ipr_config_table_hdr hdr; - struct ipr_config_table_entry dev[0]; + struct ipr_config_table_entry dev[]; }__attribute__((packed, aligned (4))); struct ipr_config_table64 { struct ipr_config_table_hdr64 hdr64; - struct ipr_config_table_entry64 dev[0]; + struct ipr_config_table_entry64 dev[]; }__attribute__((packed, aligned (8))); struct ipr_config_table_entry_wrapper { @@ -792,7 +792,7 @@ struct ipr_mode_page28 { struct ipr_mode_page_hdr hdr; u8 num_entries; u8 entry_length; - struct ipr_dev_bus_entry bus[0]; + struct ipr_dev_bus_entry bus[]; }__attribute__((packed)); struct ipr_mode_page24 { diff --git a/drivers/scsi/isci/sas.h b/drivers/scsi/isci/sas.h index dc26b4aea99e..15d8f3631ab7 100644 --- a/drivers/scsi/isci/sas.h +++ b/drivers/scsi/isci/sas.h @@ -201,7 +201,7 @@ struct smp_req { u8 func; /* byte 1 */ u8 alloc_resp_len; /* byte 2 */ u8 req_len; /* byte 3 */ - u8 req_data[0]; + u8 req_data[]; } __packed; /* diff --git a/drivers/scsi/mpt3sas/mpt3sas_scsih.c b/drivers/scsi/mpt3sas/mpt3sas_scsih.c index c597d544eb39..778d5e6ce385 100644 --- a/drivers/scsi/mpt3sas/mpt3sas_scsih.c +++ b/drivers/scsi/mpt3sas/mpt3sas_scsih.c @@ -207,7 +207,7 @@ struct fw_event_work { u8 ignore; u16 event; struct kref refcount; - char event_data[0] __aligned(4); + char event_data[] __aligned(4); }; static void fw_event_work_free(struct kref *r) diff --git a/drivers/scsi/mvsas/mv_sas.h b/drivers/scsi/mvsas/mv_sas.h index 519edc796691..327fdd5ee962 100644 --- a/drivers/scsi/mvsas/mv_sas.h +++ b/drivers/scsi/mvsas/mv_sas.h @@ -394,7 +394,7 @@ struct mvs_info { dma_addr_t bulk_buffer_dma1; #define TRASH_BUCKET_SIZE 0x20000 void *dma_pool; - struct mvs_slot_info slot_info[0]; + struct mvs_slot_info slot_info[]; }; struct mvs_prv_info{ diff --git a/drivers/scsi/mvumi.h b/drivers/scsi/mvumi.h index ec8cc2207536..60d5691fc4ab 100644 --- a/drivers/scsi/mvumi.h +++ b/drivers/scsi/mvumi.h @@ -130,7 +130,7 @@ enum { struct mvumi_hotplug_event { u16 size; u8 dummy[2]; - u8 bitmap[0]; + u8 bitmap[]; }; struct mvumi_driver_event { @@ -290,7 +290,7 @@ struct mvumi_rsp_frame { struct mvumi_ob_data { struct list_head list; - unsigned char data[0]; + unsigned char data[]; }; struct version_info { diff --git a/drivers/scsi/pmcraid.h b/drivers/scsi/pmcraid.h index a4f7eb8f50a3..15c962108075 100644 --- a/drivers/scsi/pmcraid.h +++ b/drivers/scsi/pmcraid.h @@ -623,7 +623,7 @@ struct pmcraid_aen_msg { u32 hostno; u32 length; u8 reserved[8]; - u8 data[0]; + u8 data[]; }; /* Controller state event message type */ diff --git a/drivers/scsi/snic/vnic_devcmd.h b/drivers/scsi/snic/vnic_devcmd.h index d81b4f0ceaaa..0e0fa38f8d90 100644 --- a/drivers/scsi/snic/vnic_devcmd.h +++ b/drivers/scsi/snic/vnic_devcmd.h @@ -208,7 +208,7 @@ struct vnic_devcmd_notify { struct vnic_devcmd_provinfo { u8 oui[3]; u8 type; - u8 data[0]; + u8 data[]; }; /* diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c index 33287b6bdf0e..d4f10c0d813c 100644 --- a/drivers/scsi/stex.c +++ b/drivers/scsi/stex.c @@ -236,7 +236,7 @@ struct req_msg { u8 data_dir; u8 payload_sz; /* payload size in 4-byte, not used */ u8 cdb[STEX_CDB_LENGTH]; - u32 variable[0]; + u32 variable[]; }; struct status_msg { |