CVE-2021-47005 - PCI: endpoint: Fix NULL pointer dereference for ->get_features()

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MEDIUM

PCI: endpoint: Fix NULL pointer dereference for ->get_features()

Published Feb 28, 2024

5.5

MEDIUM

CVSS 3.1

EPSS 0.24%

Description

get_features ops of pci_epc_ops may return NULL, causing NULL pointer dereference in pci_epf_test_alloc_space function. Let us add a check for pci_epc_feature pointer in pci_epf_test_bind before we access it to avoid any such NULL pointer dereference and return -ENOTSUPP in case pci_epc_feature is not found.

When the patch is not applied and EPC features is not implemented in the platform driver, we see the following dump due to kernel NULL pointer dereference.

Call trace: pci_epf_test_bind+0xf4/0x388 pci_epf_bind+0x3c/0x80 pci_epc_epf_link+0xa8/0xcc configfs_symlink+0x1a4/0x48c vfs_symlink+0x104/0x184 do_symlinkat+0x80/0xd4 __arm64_sys_symlinkat+0x1c/0x24 el0_svc_common.constprop.3+0xb8/0x170 el0_svc_handler+0x70/0x88 el0_svc+0x8/0x640 Code: d2800581 b9403ab9 f9404ebb 8b394f60 (f9400400) ---[ end trace a438e3c5a24f9df0 ]---

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
Vendor Linux Product Linux Default
affected
- Version
  5.1
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <5.1
- Version
  5.10.38
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.11.22
  Status
  unaffected
  Constraints
  <=5.11.*
- Version
  5.12.5
  Status
  unaffected
  Constraints
  <=5.12.*
- Version
  5.13
  Status
  unaffected
  Constraints
  <=*

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Linux

unaffected

Version	Status	Constraints
	affected
	affected
	affected
	affected

Linux

affected

Version	Status	Constraints
5.1	affected	-
0	unaffected	<5.1
5.10.38	unaffected	<=5.10.*
5.11.22	unaffected	<=5.11.*
5.12.5	unaffected	<=5.12.*
5.13	unaffected	<=*

Red Hat Enterprise Linux 6

kernel

Out of support scope
Red Hat Enterprise Linux 7

kernel

Out of support scope
Red Hat Enterprise Linux 7

kernel-rt

Out of support scope
Red Hat Enterprise Linux 8

kernel

Not affected
Red Hat Enterprise Linux 8

kernel-rt

Not affected
Red Hat Enterprise Linux 9

kernel

Not affected
Red Hat Enterprise Linux 9

kernel-rt

Not affected

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel	Out of support scope	n/a
Red Hat Enterprise Linux 7	kernel-rt	Out of support scope	n/a
Red Hat Enterprise Linux 8	kernel	Not affected	n/a
Red Hat Enterprise Linux 8	kernel-rt	Not affected	n/a
Red Hat Enterprise Linux 9	kernel	Not affected	n/a
Red Hat Enterprise Linux 9	kernel-rt	Not affected	n/a

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-476

NULL Pointer Dereference

References (9)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2021-47005		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2266861		Issue Tracking
https://git.kernel.org/stable/c/0169d4f0bee44fdfef908c13ed21fcb326c38695		Patch
https://git.kernel.org/stable/c/6613bc2301ba291a1c5a90e1dc24cf3edf223c03		Patch
https://git.kernel.org/stable/c/679ebad058b8168f10e63876d63b0877fd2fe784		Patch
https://git.kernel.org/stable/c/bbed83d7060e07a5d309104d25a00f0a24441428		Patch
https://lore.kernel.org/linux-cve-announce/2024022829-CVE-2021-47005-8f88@gregkh/T/#u
https://nvd.nist.gov/vuln/detail/CVE-2021-47005
https://www.cve.org/CVERecord?id=CVE-2021-47005