CVE-2022-48858 - net/mlx5: Fix a race on command flush flow

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HIGH

net/mlx5: Fix a race on command flush flow

Published Jul 16, 2024

7.0

HIGH

CVSS 3.1

EPSS 0.18%

Description

Fix a refcount use after free warning due to a race on command entry. Such race occurs when one of the commands releases its last refcount and frees its index and entry while another process running command flush flow takes refcount to this command entry. The process which handles commands flush may see this command as needed to be flushed if the other process released its refcount but didn't release the index yet. Fix it by adding the needed spin lock.

It fixes the following warning trace:

refcount_t: addition on 0; use-after-free. WARNING: CPU: 11 PID: 540311 at lib/refcount.c:25 refcount_warn_saturate+0x80/0xe0 ... RIP: 0010:refcount_warn_saturate+0x80/0xe0 ... Call Trace: <TASK> mlx5_cmd_trigger_completions+0x293/0x340 [mlx5_core] mlx5_cmd_flush+0x3a/0xf0 [mlx5_core] enter_error_state+0x44/0x80 [mlx5_core] mlx5_fw_fatal_reporter_err_work+0x37/0xe0 [mlx5_core] process_one_work+0x1be/0x390 worker_thread+0x4d/0x3d0 ? rescuer_thread+0x350/0x350 kthread+0x141/0x160 ? set_kthread_struct+0x40/0x40 ret_from_fork+0x1f/0x30 </TASK>

Affected products

Vendor Linux Product Linux Default
unaffected
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
- Version
  
  Status
  affected
  Constraints
  -
Vendor Linux Product Linux Default
unaffected
- Version
  5.4.71
  Status
  affected
  Constraints
  <5.4.185
- Version
  5.8.15
  Status
  affected
  Constraints
  <5.9
Vendor Linux Product Linux Default
affected
- Version
  5.9
  Status
  affected
  Constraints
  -
- Version
  0
  Status
  unaffected
  Constraints
  <5.9
- Version
  5.10.106
  Status
  unaffected
  Constraints
  <=5.10.*
- Version
  5.15.29
  Status
  unaffected
  Constraints
  <=5.15.*
- Version
  5.16.15
  Status
  unaffected
  Constraints
  <=5.16.*
- Version
  5.17
  Status
  unaffected
  Constraints
  <=*
- Version
  5.4.185
  Status
  unaffected
  Constraints
  <=5.4.*

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
	affected
	affected	-

Linux

unaffected

Version	Status	Constraints
5.4.71	affected	<5.4.185
5.8.15	affected	<5.9

Linux

affected

Version	Status	Constraints
5.9	affected	-
0	unaffected	<5.9
5.10.106	unaffected	<=5.10.*
5.15.29	unaffected	<=5.15.*
5.16.15	unaffected	<=5.16.*
5.17	unaffected	<=*
5.4.185	unaffected	<=5.4.*

Red Hat Enterprise Linux 6

kernel

Not affected
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

Will not fix
Red Hat Enterprise Linux 8

kernel-rt

Will not fix
Red Hat Enterprise Linux 9

kernel

Will not fix
Red Hat Enterprise Linux 9

kernel-rt

Will not fix

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	kernel	Not affected	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	Will not fix	n/a
Red Hat Enterprise Linux 8	kernel-rt	Will not fix	n/a
Red Hat Enterprise Linux 9	kernel	Will not fix	n/a
Red Hat Enterprise Linux 9	kernel-rt	Will not fix	n/a

Remediation

Red Hat mitigation

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Weaknesses (2)

CWE-362

Race Condition

CWE-416

Use After Free

References (10)

Link	Providers	Tags
https://access.redhat.com/security/cve/CVE-2022-48858		Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2298199		Issue Tracking
https://git.kernel.org/stable/c/0401bfb27a91d7bdd74b1635c1aae57cbb128da6		Patch
https://git.kernel.org/stable/c/063bd355595428750803d8736a9bb7c8db67d42d		Patch
https://git.kernel.org/stable/c/1a4017926eeea56c7540cc41b42106746ee8a0ee		Patch
https://git.kernel.org/stable/c/7c519f769f555ff7d9d4ccba3497bbb589df360a		Patch
https://git.kernel.org/stable/c/f3331bc17449f15832c31823f27573f4c0e13e5f		Patch
https://lore.kernel.org/linux-cve-announce/2024071627-CVE-2022-48858-5d3f@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-48858
https://www.cve.org/CVERecord?id=CVE-2022-48858