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scsi: mpt3sas: memset request frame before reusing 

Driver gets a request frame from the free pool of DMA-able request frames
and fill in the required information and pass the address of the frame to
IOC/FW to pull the complete request frame. In certain places the driver
used the request frame allocated from the free pool without completely
clearing the previous data stored in it. The request contents were cleared
only for the size of the new request to be issued and that left out some
stale data in the unused part of the request. Though the IOC/FW is not
expected to access the request beyond the specified size, it is good
practice to clear complete request message frame.

So reinitialize the complete request message frame with 0s before using
it.

Signed-off-by: Suganath Prabu <suganath-prabu.subramani@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Suganath Prabu 2019-08-03 09:59:47 -04:00 committed by Martin K. Petersen
parent f23ca2cb27
commit e224e03b0c
2 changed files with 3 additions and 0 deletions
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2
drivers/scsi/mpt3sas/mpt3sas_base.c
View File

@ -5035,6 +5035,7 @@ _base_allocate_memory_pools(struct MPT3SAS_ADAPTER *ioc)
_base_release_memory_pools(ioc);
goto retry_allocation;
}
memset(ioc->request, 0, sz);
if (retry_sz)
ioc_err(ioc, "request pool: dma_alloc_coherent succeed: hba_depth(%d), chains_per_io(%d), frame_sz(%d), total(%d kb)\n",
@ -5866,6 +5867,7 @@ mpt3sas_base_scsi_enclosure_processor(struct MPT3SAS_ADAPTER *ioc,
ioc->base_cmds.status = MPT3_CMD_PENDING;
request = mpt3sas_base_get_msg_frame(ioc, smid);
ioc->base_cmds.smid = smid;
memset(request, 0, ioc->request_sz);
memcpy(request, mpi_request, sizeof(Mpi2SepReply_t));
init_completion(&ioc->base_cmds.done);
ioc->put_smid_default(ioc, smid);

1
drivers/scsi/mpt3sas/mpt3sas_ctl.c
View File

@ -715,6 +715,7 @@ _ctl_do_mpt_command(struct MPT3SAS_ADAPTER *ioc, struct mpt3_ioctl_command karg,
ioc->ctl_cmds.status = MPT3_CMD_PENDING;
memset(ioc->ctl_cmds.reply, 0, ioc->reply_sz);
request = mpt3sas_base_get_msg_frame(ioc, smid);
memset(request, 0, ioc->request_sz);
memcpy(request, mpi_request, karg.data_sge_offset*4);
ioc->ctl_cmds.smid = smid;
data_out_sz = karg.data_out_size;