Bug 2054135 (CVE-2021-44879)

Summary:	CVE-2021-44879 kernel: NULL pointer dereference in folio_mark_dirty() via a crafted f2fs image
Product:	[Other] Security Response	Reporter:	Marian Rehak <mrehak>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acaringi, adscvr, airlied, alciregi, bdettelb, bhu, bskeggs, chwhite, crwood, dvlasenk, hdegoede, hkrzesin, jarod, jarodwilson, jburrell, jeremy, jfaracco, jforbes, jglisse, jlelli, joe.lawrence, jonathan, josef, jshortt, jstancek, jwboyer, jwyatt, kcarcia, kernel-maint, kernel-mgr, lgoncalv, linville, lzampier, masami256, mchehab, nmurray, ptalbert, qzhao, rvrbovsk, scweaver, steved, vkumar, walters, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 5.17 rc1	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-05-10 17:42:53 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2054137, 2056274, 2056275
Bug Blocks:	2054138

Description Marian Rehak 2022-02-14 09:28:46 UTC

There is an NULL pointer dereference in move_data_page in fs/f2fs/gc.c when f2fs tries to migrate a block that belongs to special file, and the file doesn't have assigned address space operations pointer array for mapping->a_ops field but called  a_ops->set_dirty_page().

Reference:

https://bugzilla.kernel.org/show_bug.cgi?id=215231

Comment 1 Marian Rehak 2022-02-14 09:30:56 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 2054137]

Comment 2 Justin M. Forbes 2022-02-15 18:59:53 UTC

This was fixed for Fedora with the 5.15.17 stable kernel updates.

Comment 14 Product Security DevOps Team 2023-05-10 17:42:48 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-44879