scsi: mpt3sas: Fix NULL pointer access in mpt3sas_transport_port_add()

stable inclusion
from stable-v5.10.176
commit 6f0c2f70d9929208d8427ec72c3ed91e2251e289
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I8AGBT
CVE: NA

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=6f0c2f70d9929208d8427ec72c3ed91e2251e289



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[ Upstream commit d3c57724 ]

Port is allocated by sas_port_alloc_num() and rphy is allocated by either
sas_end_device_alloc() or sas_expander_alloc(), all of which may return
NULL. So we need to check the rphy to avoid possible NULL pointer access.

If sas_rphy_add() returned with failure, rphy is set to NULL. We would
access the rphy in the following lines which would also result NULL pointer
access.

Fixes: 78316e9d ("scsi: mpt3sas: Fix possible resource leaks in mpt3sas_transport_port_add()")
Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
Link: https://lore.kernel.org/r/20230225100135.2109330-1-haowenchao2@huawei.com


Acked-by: Sathya Prakash Veerichetty <sathya.prakash@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Hao Zhang <Hao.Zhang@windriver.com>