ata: libata-transport: fix error handling in ata_tdev_add()

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

ata: libata-transport: fix error handling in ata_tdev_add()

In ata_tdev_add(), the return value of transport_add_device() is

not checked. As a result, it causes null-ptr-deref while removing

the module, because transport_remove_device() is called to remove

the device that was not added.

Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0

CPU: 13 PID: 13603 Comm: rmmod Kdump: loaded Tainted: G W 6.1.0-rc3+ #36

pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : device_del+0x48/0x3a0

lr : device_del+0x44/0x3a0

Call trace:

device_del+0x48/0x3a0

attribute_container_class_device_del+0x28/0x40

transport_remove_classdev+0x60/0x7c

attribute_container_device_trigger+0x118/0x120

transport_remove_device+0x20/0x30

ata_tdev_delete+0x24/0x50 [libata]

ata_tlink_delete+0x40/0xa0 [libata]

ata_tport_delete+0x2c/0x60 [libata]

ata_port_detach+0x148/0x1b0 [libata]

ata_pci_remove_one+0x50/0x80 [libata]

ahci_remove_one+0x4c/0x8c [ahci]

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

in ata_tdev_add(). In the error path, device_del() is called to delete

the device which was added earlier in this function, and ata_tdev_free()

is called to free ata_dev.