linux-cve-announce - CVE-2022-50581: hfs: fix OOB Read in __hfs_brec

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Message-ID: <2025102209-CVE-2022-50581-cb39@gregkh>
Date: Wed, 22 Oct 2025 15:24:29 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50581: hfs: fix OOB Read in __hfs_brec_find

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

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

hfs: fix OOB Read in __hfs_brec_find

Syzbot reported a OOB read bug:

==================================================================
BUG: KASAN: slab-out-of-bounds in hfs_strcmp+0x117/0x190
fs/hfs/string.c:84
Read of size 1 at addr ffff88807eb62c4e by task kworker/u4:1/11
CPU: 1 PID: 11 Comm: kworker/u4:1 Not tainted
6.1.0-rc6-syzkaller-00308-g644e9524388a #0
Workqueue: writeback wb_workfn (flush-7:0)
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 print_address_description+0x74/0x340 mm/kasan/report.c:284
 print_report+0x107/0x1f0 mm/kasan/report.c:395
 kasan_report+0xcd/0x100 mm/kasan/report.c:495
 hfs_strcmp+0x117/0x190 fs/hfs/string.c:84
 __hfs_brec_find+0x213/0x5c0 fs/hfs/bfind.c:75
 hfs_brec_find+0x276/0x520 fs/hfs/bfind.c:138
 hfs_write_inode+0x34c/0xb40 fs/hfs/inode.c:462
 write_inode fs/fs-writeback.c:1440 [inline]

If the input inode of hfs_write_inode() is incorrect:
struct inode
  struct hfs_inode_info
    struct hfs_cat_key
      struct hfs_name
        u8 len # len is greater than HFS_NAMELEN(31) which is the
maximum length of an HFS filename

OOB read occurred:
hfs_write_inode()
  hfs_brec_find()
    __hfs_brec_find()
      hfs_cat_keycmp()
        hfs_strcmp() # OOB read occurred due to len is too large

Fix this by adding a Check on len in hfs_write_inode() before calling
hfs_brec_find().

The Linux kernel CVE team has assigned CVE-2022-50581 to this issue.


Affected and fixed versions
===========================

	Fixed in 4.9.337 with commit 8c40f2dbae603ef0bd21e87c63f54ec59fd88256
	Fixed in 4.14.303 with commit c886c10a6eddb99923b315f42bf63f448883ef9a
	Fixed in 4.19.270 with commit 2344f17c0a89c181ab1a9fef57fd8c3bddfd6e30
	Fixed in 5.4.229 with commit 90103ccb6e60aa4efe48993d23d6a528472f2233
	Fixed in 5.10.163 with commit 4fd3a11804c8877ff11fec59c5c53f1635331e3e
	Fixed in 5.15.86 with commit 367296925c7625c3969d2a78d7a3e1dee161beb5
	Fixed in 6.0.16 with commit e9e692917c6e10a7066c7a6d092dcdc3d4e329f3
	Fixed in 6.1.2 with commit bfc9d8f27f89717431a6aecce42ae230b437433f
	Fixed in 6.2 with commit 8d824e69d9f3fa3121b2dda25053bae71e2460d2

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2022-50581
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	fs/hfs/inode.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/8c40f2dbae603ef0bd21e87c63f54ec59fd88256
	https://git.kernel.org/stable/c/c886c10a6eddb99923b315f42bf63f448883ef9a
	https://git.kernel.org/stable/c/2344f17c0a89c181ab1a9fef57fd8c3bddfd6e30
	https://git.kernel.org/stable/c/90103ccb6e60aa4efe48993d23d6a528472f2233
	https://git.kernel.org/stable/c/4fd3a11804c8877ff11fec59c5c53f1635331e3e
	https://git.kernel.org/stable/c/367296925c7625c3969d2a78d7a3e1dee161beb5
	https://git.kernel.org/stable/c/e9e692917c6e10a7066c7a6d092dcdc3d4e329f3
	https://git.kernel.org/stable/c/bfc9d8f27f89717431a6aecce42ae230b437433f
	https://git.kernel.org/stable/c/8d824e69d9f3fa3121b2dda25053bae71e2460d2