Bug 1224975 (CVE-2021-47295)

Summary:	VUL-0: CVE-2021-47295: kernel: net: sched: fix memory leak in tcindex_partial_destroy_work
Product:	[Novell Products] SUSE Security Incidents	Reporter:	SMASH SMASH <smash_bz>
Component:	Incidents	Assignee:	Michal Koutný <mkoutny>
Status:	IN_PROGRESS ---	QA Contact:	Security Team bot <security-team>
Severity:	Normal
Priority:	P3 - Medium	CC:	gabriele.sonnu, mkoutny
Version:	unspecified
Target Milestone:	---
Hardware:	Other
OS:	Other
URL:	https://smash.suse.de/issue/406929/
See Also:	https://bugzilla.suse.com/show_bug.cgi?id=1219397
Whiteboard:	CVSSv3.1:SUSE:CVE-2021-47295:5.5:(AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Found By:	Security Response Team	Services Priority:
Business Priority:		Blocker:	---
Marketing QA Status:	---	IT Deployment:	---

Description SMASH SMASH 2024-05-22 12:35:18 UTC

In the Linux kernel, the following vulnerability has been resolved:

net: sched: fix memory leak in tcindex_partial_destroy_work

Syzbot reported memory leak in tcindex_set_parms(). The problem was in
non-freed perfect hash in tcindex_partial_destroy_work().

In tcindex_set_parms() new tcindex_data is allocated and some fields from
old one are copied to new one, but not the perfect hash. Since
tcindex_partial_destroy_work() is the destroy function for old
tcindex_data, we need to free perfect hash to avoid memory leak.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47295
https://www.cve.org/CVERecord?id=CVE-2021-47295
https://git.kernel.org/stable/c/8d7924ce85bae64e7a67c366c7c50840f49f3a62
https://git.kernel.org/stable/c/8e9662fde6d63c78eb1350f6167f64c9d71a865b
https://git.kernel.org/stable/c/cac71d27745f92ee13f0ecc668ffe151a4a9c9b1
https://git.kernel.org/stable/c/f5051bcece50140abd1a11a2d36dc3ec5484fc32
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47295.mbox