CVE-2025-39865

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

tee: fix NULL pointer dereference in tee_shm_put

tee_shm_put have NULL pointer dereference:

__optee_disable_shm_cache -->

shm = reg_pair_to_ptr(...);//shm maybe return NULL

tee_shm_free(shm); -->

tee_shm_put(shm);//crash

Add check in tee_shm_put to fix it.

panic log:

Unable to handle kernel paging request at virtual address 0000000000100cca

Mem abort info:

ESR = 0x0000000096000004

EC = 0x25: DABT (current EL), IL = 32 bits

SET = 0, FnV = 0

EA = 0, S1PTW = 0

FSC = 0x04: level 0 translation fault

Data abort info:

ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000

CM = 0, WnR = 0, TnD = 0, TagAccess = 0

GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0

user pgtable: 4k pages, 48-bit VAs, pgdp=0000002049d07000

[0000000000100cca] pgd=0000000000000000, p4d=0000000000000000

Internal error: Oops: 0000000096000004 [#1] SMP

CPU: 2 PID: 14442 Comm: systemd-sleep Tainted: P OE ------- ----

6.6.0-39-generic #38

Source Version: 938b255f6cb8817c95b0dd5c8c2944acfce94b07

Hardware name: greatwall GW-001Y1A-FTH, BIOS Great Wall BIOS V3.0

10/26/2022

pstate: 80000005 (Nzcv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : tee_shm_put+0x24/0x188

lr : tee_shm_free+0x14/0x28

sp : ffff001f98f9faf0

x29: ffff001f98f9faf0 x28: ffff0020df543cc0 x27: 0000000000000000

x26: ffff001f811344a0 x25: ffff8000818dac00 x24: ffff800082d8d048

x23: ffff001f850fcd18 x22: 0000000000000001 x21: ffff001f98f9fb88

x20: ffff001f83e76218 x19: ffff001f83e761e0 x18: 000000000000ffff

x17: 303a30303a303030 x16: 0000000000000000 x15: 0000000000000003

x14: 0000000000000001 x13: 0000000000000000 x12: 0101010101010101

x11: 0000000000000001 x10: 0000000000000001 x9 : ffff800080e08d0c

x8 : ffff001f98f9fb88 x7 : 0000000000000000 x6 : 0000000000000000

x5 : 0000000000000000 x4 : 0000000000000000 x3 : 0000000000000000

x2 : ffff001f83e761e0 x1 : 00000000ffff001f x0 : 0000000000100cca

Call trace:

tee_shm_put+0x24/0x188

tee_shm_free+0x14/0x28

__optee_disable_shm_cache+0xa8/0x108

optee_shutdown+0x28/0x38

platform_shutdown+0x28/0x40

device_shutdown+0x144/0x2b0

kernel_power_off+0x3c/0x80

hibernate+0x35c/0x388

state_store+0x64/0x80

kobj_attr_store+0x14/0x28

sysfs_kf_write+0x48/0x60

kernfs_fop_write_iter+0x128/0x1c0

vfs_write+0x270/0x370

ksys_write+0x6c/0x100

__arm64_sys_write+0x20/0x30

invoke_syscall+0x4c/0x120

el0_svc_common.constprop.0+0x44/0xf0

do_el0_svc+0x24/0x38

el0_svc+0x24/0x88

el0t_64_sync_handler+0x134/0x150

el0t_64_sync+0x14c/0x15