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megaraid_sas: fix the problem of non-existing VD exposed to host 

This patch will address the issue of SCSI device created at OS level for
non existing VD. ldTgtIdtoLd[] array has size 256 for Extended VD firmware
and 128 for legacy firmware. Accessing indices beyond array size (OS will
send TUR, INQUIRY.. commands upto device index 255), may return valid LD
value and that particular SCSI command will be SUCCESS and creating SCSI
device for non existing target(VD).

For legacy firmware (64 VD firmware), invalidates LD (by setting LD value
to 0xff) in LdTgtIdtoLd[] array for device index beyond 127, so that
invalid LD(0xff) value should be returned beyond device index beyond 127.

Cc: <stable@vger.kernel.org>
Signed-off-by: Kashyap Desai <kashyap.desai@avagotech.com>
Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Sumit.Saxena@avagotech.com 2015-01-05 20:06:08 +05:30 committed by Christoph Hellwig
parent 7497cde883
commit ab2f0608e1
2 changed files with 15 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/scsi/megaraid/megaraid_sas_fp.c
View File

@ -212,6 +212,9 @@ void MR_PopulateDrvRaidMap(struct megasas_instance *instance)
for (i = 0; i < MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS; i++)
pDrvRaidMap->ldTgtIdToLd[i] =
(u8)pFwRaidMap->ldTgtIdToLd[i];
for (i = (MAX_RAIDMAP_LOGICAL_DRIVES + MAX_RAIDMAP_VIEWS);
i < MAX_LOGICAL_DRIVES_EXT; i++)
pDrvRaidMap->ldTgtIdToLd[i] = 0xff;
for (i = 0; i < ld_count; i++) {
pDrvRaidMap->ldSpanMap[i] = pFwRaidMap->ldSpanMap[i];
#if VD_EXT_DEBUG

14
drivers/scsi/megaraid/megaraid_sas_fusion.c
View File

@ -1725,9 +1725,19 @@ megasas_build_dcdb_fusion(struct megasas_instance *instance,
if (scmd->device->channel < MEGASAS_MAX_PD_CHANNELS)
goto NonFastPath;
/*
* For older firmware, Driver should not access ldTgtIdToLd
* beyond index 127 and for Extended VD firmware, ldTgtIdToLd
* should not go beyond 255.
*/
if ((!fusion->fast_path_io) ||
(device_id >= instance->fw_supported_vd_count))
goto NonFastPath;
ld = MR_TargetIdToLdGet(device_id, local_map_ptr);
if ((ld >= instance->fw_supported_vd_count) ||
(!fusion->fast_path_io))
if (ld >= instance->fw_supported_vd_count)
goto NonFastPath;
raid = MR_LdRaidGet(ld, local_map_ptr);