CVE-2023-54058

/// Technical description

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

firmware: arm_ffa: Check if ffa_driver remove is present before executing

Currently ffa_drv->remove() is called unconditionally from

ffa_device_remove(). Since the driver registration doesn't check for it

and allows it to be registered without .remove callback, we need to check

for the presence of it before executing it from ffa_device_remove() to

above a NULL pointer dereference like the one below:

| Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000

| Mem abort info:

| ESR = 0x0000000086000004

| EC = 0x21: IABT (current EL), IL = 32 bits

| SET = 0, FnV = 0

| EA = 0, S1PTW = 0

| FSC = 0x04: level 0 translation fault

| user pgtable: 4k pages, 48-bit VAs, pgdp=0000000881cc8000

| [0000000000000000] pgd=0000000000000000, p4d=0000000000000000

| Internal error: Oops: 0000000086000004 [#1] PREEMPT SMP

| CPU: 3 PID: 130 Comm: rmmod Not tainted 6.3.0-rc7 #6

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References