System crashed in 'mntput()' which was called from 'ReleasePath()' in the module 'sisips'

Issue

• System crashed with the below log.

...
[11136697.812507] BUG: unable to handle kernel NULL pointer dereference at 0000000000000134
[11136697.812872] IP: [<ffffffff99c8073e>] mntput+0xe/0x40
[11136697.813070] PGD 44e3301067 PUD 44e32da067 PMD 0 
[11136697.813260] Oops: 0000 [#1] SMP 
[11136697.813428] Modules linked in: tcp_diag udp_diag inet_diag iptable_filter sisfim(PE) ipmi_devintf ipmi_msghandler vmw_vsock_vmci_transport vsock vmw_balloon ppdev iosf_mbi crc32_pclmul ghash_clmulni_intel aesni_intel lrw gf128mul glue_helper ablk_helper cryptd dm_multipath pcspkr joydev sg vmw_vmci i2c_piix4 parport_pc parport binfmt_misc sisips(PE) ip_tables xfs libcrc32c sr_mod cdrom ata_generic pata_acpi sd_mod drm_kms_helper crc_t10dif crct10dif_generic syscopyarea sysfillrect sysimgblt fb_sys_fops ttm ahci drm nfit libahci ata_piix crct10dif_pclmul crct10dif_common libata crc32c_intel libnvdimm serio_raw vmxnet3 vmw_pvscsi drm_panel_orientation_quirks dm_mirror dm_region_hash dm_log dm_mod fuse
[11136697.815484] CPU: 2 PID: 19618 Comm: apps.plugin Kdump: loaded Tainted: P            E  ------------   3.10.0-1160.80.1.el7.x86_64 #1
[11136697.815890] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 12/12/2018
[11136697.816279] task: ffff8d3e8d07b180 ti: ffff8d3ea2f70000 task.ti: ffff8d3ea2f70000
[11136697.816621] RIP: 0010:[<ffffffff99c8073e>]  [<ffffffff99c8073e>] mntput+0xe/0x40
[11136697.816971] RSP: 0018:ffff8d3ea2f73ce0  EFLAGS: 00010202
[11136697.817165] RAX: 0000000000000040 RBX: ffff8d3ea2f73d10 RCX: 000000000000002f
[11136697.817502] RDX: 0000000000000002 RSI: 0000000000000000 RDI: 0000000000000040
[11136697.817838] RBP: ffff8d3ea2f73cf8 R08: 0000000000000000 R09: 0000000000000000
[11136697.818175] R10: ffff8d293fc03e00 R11: fff00000f0000000 R12: ffff8d2810977000
[11136697.818512] R13: 0000000000000000 R14: 00000000ffffff9c R15: ffff8d2810977000
[11136697.818850] FS:  00007f6ed728f8c0(0000) GS:ffff8d3ea3c80000(0000) knlGS:0000000000000000
[11136697.819200] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[11136697.819401] CR2: 0000000000000134 CR3: 00000044df1fc000 CR4: 00000000007607e0
[11136697.819770] PKRU: 55555554
[11136697.819929] Call Trace:
[11136697.820089]  [<ffffffff99c669be>] ? path_put+0x1e/0x30
[11136697.820292]  [<ffffffffc03c8ba5>] ReleasePath+0x5/0x20 [sisips]
[11136697.820504]  [<ffffffffc03e3446>] ? _ZL13BuildFullPathiPKcb+0x216/0x2a0 [sisips]
[11136697.820851]  [<ffffffffc03e3a1c>] ? _Z11GetFullPathiPKcS0_b+0x2bc/0x480 [sisips]
[11136697.821199]  [<ffffffffc03d1d8c>] ? _ZL11GetFilePathiR10PathStringPKcP7Processb+0x4c/0xa0 [sisips]
[11136697.821569]  [<ffffffffc03d7548>] ? sisips_hook_sys_readlink+0x198/0x220 [sisips]
[11136697.821913]  [<ffffffff99c61fb0>] ? SyS_readlinkat+0x150/0x150
[11136697.822120]  [<ffffffffc03c55ef>] ? sisips64_sys_readlink+0xf/0x20 [sisips]
[11136697.822458]  [<ffffffff9a1c539a>] ? system_call_fastpath+0x25/0x2a
[11136697.822665] Code: 59 f0 ff ff 49 8b 44 24 60 4c 89 e7 4c 8d 60 a0 eb d5 90 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 85 ff 48 89 f8 74 18 55 <8b> 90 f4 00 00 00 48 8d 7f e0 48 89 e5 85 d2 75 0b e8 7c fe ff 
[11136697.823396] RIP  [<ffffffff99c8073e>] mntput+0xe/0x40
[11136697.823590]  RSP <ffff8d3ea2f73ce0>
[11136697.823760] CR2: 0000000000000134