linux-cve-announce - CVE-2022-49928: SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed

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Message-ID: <2025050111-CVE-2022-49928-3664@gregkh>
Date: Thu,  1 May 2025 16:11:58 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49928: SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed

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

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

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

SUNRPC: Fix null-ptr-deref when xps sysfs alloc failed

There is a null-ptr-deref when xps sysfs alloc failed:
  BUG: KASAN: null-ptr-deref in sysfs_do_create_link_sd+0x40/0xd0
  Read of size 8 at addr 0000000000000030 by task gssproxy/457

  CPU: 5 PID: 457 Comm: gssproxy Not tainted 6.0.0-09040-g02357b27ee03 #9
  Call Trace:
   <TASK>
   dump_stack_lvl+0x34/0x44
   kasan_report+0xa3/0x120
   sysfs_do_create_link_sd+0x40/0xd0
   rpc_sysfs_client_setup+0x161/0x1b0
   rpc_new_client+0x3fc/0x6e0
   rpc_create_xprt+0x71/0x220
   rpc_create+0x1d4/0x350
   gssp_rpc_create+0xc3/0x160
   set_gssp_clnt+0xbc/0x140
   write_gssp+0x116/0x1a0
   proc_reg_write+0xd6/0x130
   vfs_write+0x177/0x690
   ksys_write+0xb9/0x150
   do_syscall_64+0x35/0x80
   entry_SYSCALL_64_after_hwframe+0x46/0xb0

When the xprt_switch sysfs alloc failed, should not add xprt and
switch sysfs to it, otherwise, maybe null-ptr-deref; also initialize
the 'xps_sysfs' to NULL to avoid oops when destroy it.

The Linux kernel CVE team has assigned CVE-2022-49928 to this issue.


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

	Issue introduced in 5.14 with commit baea99445dd4675a834e8a5987d2f368adb62e6c and fixed in 5.15.78 with commit d59722d088a9d86ce6d9d39979e5d1d669d249f7
	Issue introduced in 5.14 with commit baea99445dd4675a834e8a5987d2f368adb62e6c and fixed in 6.0.8 with commit 7b189b0aa8dab14b49c31c65af8a982e96e25b62
	Issue introduced in 5.14 with commit baea99445dd4675a834e8a5987d2f368adb62e6c and fixed in 6.1 with commit cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a

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-2022-49928
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:
	net/sunrpc/sysfs.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/d59722d088a9d86ce6d9d39979e5d1d669d249f7
	https://git.kernel.org/stable/c/7b189b0aa8dab14b49c31c65af8a982e96e25b62
	https://git.kernel.org/stable/c/cbdeaee94a415800c65a8c3fa04d9664a8b8fb3a