[PATCH 5.4 007/191] scsi: mpt3sas: Reject NVMe Encap cmnds to unsupported HBA

Greg Kroah-Hartman
2020-01-02T22:12:29Z

From: Sreekanth Reddy <sreekanth.reddy@broadcom.com>

[ Upstream commit 77fd4f2c88bf83205a21f9ca49fdcc0c7868dba9 ]

If any faulty application issues an NVMe Encapsulated commands to HBA which
doesn't support NVMe protocol then driver should return the command as
invalid with the following message.

"HBA doesn't support NVMe. Rejecting NVMe Encapsulated request."

Otherwise below page fault kernel panic will be observed while building the
PRPs as there is no PRP pools allocated for the HBA which doesn't support
NVMe drives.

RIP: 0010:_base_build_nvme_prp+0x3b/0xf0 [mpt3sas]
Call Trace:
_ctl_do_mpt_command+0x931/0x1120 [mpt3sas]
_ctl_ioctl_main.isra.11+0xa28/0x11e0 [mpt3sas]
? prepare_to_wait+0xb0/0xb0
? tty_ldisc_deref+0x16/0x20
_ctl_ioctl+0x1a/0x20 [mpt3sas]
do_vfs_ioctl+0xaa/0x620
? vfs_read+0x117/0x140
ksys_ioctl+0x67/0x90
__x64_sys_ioctl+0x1a/0x20
do_syscall_64+0x60/0x190
entry_SYSCALL_64_after_hwframe+0x44/0xa9

[mkp: tweaked error string]

Link: https://lore.kernel.org/r/1568379890-18347-12-git-send-email-sreekanth.reddy@broadcom.com
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/mpt3sas/mpt3sas_ctl.c | 12 ++++++++++++
1 file changed, 12 insertions(+)

diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
index 3c463e8f6074..b95f7d062ea4 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
@@ -778,6 +778,18 @@ _ctl_do_mpt_command(struct MPT3SAS_ADAPTER *ioc, struct mpt3_ioctl_command karg,
case MPI2_FUNCTION_NVME_ENCAPSULATED:
{
nvme_encap_request = (Mpi26NVMeEncapsulatedRequest_t *)request;
+ if (!ioc->pcie_sg_lookup) {
+ dtmprintk(ioc, ioc_info(ioc,
+ "HBA doesn't support NVMe. Rejecting NVMe Encapsulated request.\n"
+ ));
+
+ if (ioc->logging_level & MPT_DEBUG_TM)
+ _debug_dump_mf(nvme_encap_request,
+ ioc->request_sz/4);
+ mpt3sas_base_free_smid(ioc, smid);
+ ret = -EINVAL;
+ goto out;
+ }
/*
* Get the Physical Address of the sense buffer.
* Use Error Response buffer address field to hold the sense
--
2.20.1