scsi: scsi_transport_sas: Fix error handling in sas_phy_add()

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

scsi: scsi_transport_sas: Fix error handling in sas_phy_add()

If transport_add_device() fails in sas_phy_add(), the kernel will crash

trying to delete the device in transport_remove_device() called from

sas_remove_host().

Unable to handle kernel NULL pointer dereference at virtual address 0000000000000108

CPU: 61 PID: 42829 Comm: rmmod Kdump: loaded Tainted: G W 6.1.0-rc1+ #173

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_phy_delete+0x30/0x60 [scsi_transport_sas]

do_sas_phy_delete+0x6c/0x80 [scsi_transport_sas]

device_for_each_child+0x68/0xb0

sas_remove_children+0x40/0x50 [scsi_transport_sas]

sas_remove_host+0x20/0x38 [scsi_transport_sas]

hisi_sas_remove+0x40/0x68 [hisi_sas_main]

hisi_sas_v2_remove+0x20/0x30 [hisi_sas_v2_hw]

platform_remove+0x2c/0x60

Fix this by checking and handling return value of transport_add_device()

in sas_phy_add().