scsi: mpt3sas: Fix possible resource leaks in mpt3sas_transport_port_add()

In the Linux kernel, the following vulnerability has been resolved:

scsi: mpt3sas: Fix possible resource leaks in mpt3sas_transport_port_add()

In mpt3sas_transport_port_add(), if sas_rphy_add() returns error,

sas_rphy_free() needs be called to free the resource allocated in

sas_end_device_alloc(). Otherwise a kernel crash will happen:

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000108

CPU: 45 PID: 37020 Comm: bash Kdump: loaded Tainted: G W 6.1.0-rc1+ #189

pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : device_del+0x54/0x3d0

lr : device_del+0x37c/0x3d0

Call trace:

device_del+0x54/0x3d0

attribute_container_class_device_del+0x28/0x38

transport_remove_classdev+0x6c/0x80

attribute_container_device_trigger+0x108/0x110

transport_remove_device+0x28/0x38

sas_rphy_remove+0x50/0x78 [scsi_transport_sas]

sas_port_delete+0x30/0x148 [scsi_transport_sas]

do_sas_phy_delete+0x78/0x80 [scsi_transport_sas]

device_for_each_child+0x68/0xb0

sas_remove_children+0x30/0x50 [scsi_transport_sas]

sas_rphy_remove+0x38/0x78 [scsi_transport_sas]

sas_port_delete+0x30/0x148 [scsi_transport_sas]

do_sas_phy_delete+0x78/0x80 [scsi_transport_sas]

device_for_each_child+0x68/0xb0

sas_remove_children+0x30/0x50 [scsi_transport_sas]

sas_remove_host+0x20/0x38 [scsi_transport_sas]

scsih_remove+0xd8/0x420 [mpt3sas]

Because transport_add_device() is not called when sas_rphy_add() fails, the

device is not added. When sas_rphy_remove() is subsequently called to

remove the device in the remove() path, a NULL pointer dereference happens.