System crash after page allocation error in cond_list_destroy called from load_policy

Issue

• The system crashes after page allocation failure:

[1254687.039825] SELinux:  policy capability cgroup_seclabel=1
[1254687.039825] SELinux:  policy capability nnp_nosuid_transition=1
[1256482.979670] load_policy: page allocation failure: order:4, mode:0x60c0c0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0
[1256482.979682] CPU: 3 PID: 2089281 Comm: load_policy Not tainted 4.18.0-348.7.1.el8_5.x86_64 #1
[1256482.979684] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[1256482.979685] Call Trace:
[1256482.979698]  dump_stack+0x5c/0x80
[1256482.979706]  warn_alloc.cold.114+0x7b/0x10d
[1256482.979713]  ? _cond_resched+0x15/0x30
[1256482.979714]  ? __alloc_pages_direct_compact+0x157/0x160
[1256482.979716]  __alloc_pages_slowpath+0xc87/0xcd0
[1256482.979723]  ? get_partial_node.isra.83.part.84+0x1da/0x280
[1256482.979726]  __alloc_pages_nodemask+0x2db/0x310
[1256482.979731]  kmalloc_order+0x28/0x90
[1256482.979732]  kmalloc_order_trace+0x1d/0xa0
[1256482.979734]  __kmalloc+0x1ee/0x240
[1256482.979741]  cond_read_av_list.isra.6+0x93/0x140       
[1256482.979744]  ? __kmalloc+0x102/0x240
[1256482.979747]  cond_read_list+0x1a6/0x260
[1256482.979751]  policydb_read+0x547/0x1230
[1256482.979753]  security_load_policy+0xa8/0x5e0
[1256482.979759]  ? copy_user_generic_unrolled+0x32/0xc0
[1256482.979763]  sel_write_load+0xde/0x1a0
[1256482.979768]  vfs_write+0xa5/0x1a0
[1256482.979769]  ksys_write+0x4f/0xb0
[1256482.979775]  do_syscall_64+0x5b/0x1a0
[1256482.979778]  entry_SYSCALL_64_after_hwframe+0x65/0xca
[1256482.979782] RIP: 0033:0x7f1036ae9648
...
[1256482.985546] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
[1256482.985741] PGD 0 P4D 0 
[1256482.985783] Oops: 0000 [#1] SMP PTI
[1256482.985835] CPU: 3 PID: 2089281 Comm: load_policy Not tainted 4.18.0-348.7.1.el8_5.x86_64 #1
[1256482.985935] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[1256482.986059] RIP: 0010:cond_list_destroy.isra.5+0x31/0x70
[1256482.986128] Code: 41 55 49 89 fd 41 54 55 53 85 c0 74 3e 49 89 f4 31 db 89 da 83 c3 01 48 8d 04 d5 00 00 00 00 48 29 d0 49 8b 55 00 48 8d 2c c2 <48> 8b 7d 08 e8 26 de ed ff 48 8b 7d 18 e8 1d de ed ff 48 8b 7d 28
[1256482.986342] RSP: 0018:ffffb72dd0e8fcf0 EFLAGS: 00010246
[1256482.986413] RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000080400003
[1256482.986542] RDX: 0000000000000000 RSI: ffff94db0c522bf0 RDI: ffff94db0c522be8
[1256482.986668] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffffff94e10400
[1256482.986764] R10: ffff94db1a09ca40 R11: 0000000000000001 R12: ffff94db0c522bf0
[1256482.986860] R13: ffff94db0c522be8 R14: ffff94db0c522a50 R15: 00000000fffffff4
[1256482.986954] FS:  00007f10374b6640(0000) GS:ffff94dc37d80000(0000) knlGS:0000000000000000
[1256482.987058] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[1256482.987134] CR2: 0000000000000008 CR3: 000000016a6d0001 CR4: 00000000003706e0
[1256482.987256] Call Trace:
[1256482.987302]  policydb_destroy+0x15c/0x260
[1256482.987363]  policydb_read+0x34d/0x1230
[1256482.987421]  security_load_policy+0xa8/0x5e0
[1256482.987550]  ? copy_user_generic_unrolled+0x32/0xc0
[1256482.987628]  sel_write_load+0xde/0x1a0
[1256482.987685]  vfs_write+0xa5/0x1a0
[1256482.987738]  ksys_write+0x4f/0xb0
[1256482.987791]  do_syscall_64+0x5b/0x1a0
[1256482.987849]  entry_SYSCALL_64_after_hwframe+0x65/0xca
[1256482.987920] RIP: 0033:0x7f1036ae9648