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scsi: ibmvscsis: Silence -Warray-bounds warning

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Instead of doing a cast to storage that is too small, add a union for the
high 64 bits. Silences the warnings under -Warray-bounds:

drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c: In function 'ibmvscsis_send_messages':
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1934:44: error: array subscript 'struct viosrp_crq[0]' is partly outside array bounds of 'u64[1]' {aka 'long long unsigned int[1]'} [-Werror=array-bounds]
 1934 |                                         crq->valid = VALID_CMD_RESP_EL;
      |                                            ^~
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c:1875:13: note: while referencing 'msg_hi'
 1875 |         u64 msg_hi = 0;
      |             ^~~~~~

There is no change to the resulting binary instructions.

Link: https://lore.kernel.org/lkml/20220125142430.75c3160e@canb.auug.org.au
Link: https://lore.kernel.org/r/20220208061231.3429486-1-keescook@chromium.org
Cc: Michael Cyr <mikecyr@linux.ibm.com>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Tyrel Datwyler <tyreld@linux.ibm.com>
Cc: linux-scsi@vger.kernel.org
Cc: target-devel@vger.kernel.org
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Kees Cook 2022-02-07 22:12:31 -08:00 • committed by Martin K. Petersen
parent 49b729f58e
commit 03e4383c7c
2 changed files with 14 additions and 12 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

9
drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c
View file

@ -1872,11 +1872,8 @@ static void srp_snd_msg_failed(struct scsi_info *vscsi, long rc)
*/
static void ibmvscsis_send_messages(struct scsi_info *vscsi)
{
u64 msg_hi = 0;
/* note do not attempt to access the IU_data_ptr with this pointer
* it is not valid
*/
struct viosrp_crq *crq = (struct viosrp_crq *)&msg_hi;
struct viosrp_crq empty_crq = { };
struct viosrp_crq *crq = &empty_crq;
struct ibmvscsis_cmd *cmd, *nxt;
long rc = ADAPT_SUCCESS;
bool retry = false;
@ -1940,7 +1937,7 @@ static void ibmvscsis_send_messages(struct scsi_info *vscsi)
crq->IU_length = cpu_to_be16(cmd->rsp.len);
rc = h_send_crq(vscsi->dma_dev->unit_address,
be64_to_cpu(msg_hi),
be64_to_cpu(crq->high),
be64_to_cpu(cmd->rsp.tag));
dev_dbg(&vscsi->dev, "send_messages: cmd %p, tag 0x%llx, rc %ld\n",

5
include/scsi/viosrp.h
View file

@ -70,12 +70,17 @@ enum viosrp_crq_status {
};
struct viosrp_crq {
union {
__be64 high; /* High 64 bits */
struct {
u8 valid; /* used by RPA */
u8 format; /* SCSI vs out-of-band */
u8 reserved;
u8 status; /* non-scsi failure? (e.g. DMA failure) */
__be16 timeout; /* in seconds */
__be16 IU_length; /* in bytes */
};
};
__be64 IU_data_ptr; /* the TCE for transferring data */
};