linux-cve-announce - CVE-2025-21805: RDMA/rtrs: Add missing deinit() call

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Message-ID: <2025022753-CVE-2025-21805-7256@gregkh>
Date: Thu, 27 Feb 2025 11:59:59 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21805: RDMA/rtrs: Add missing deinit() call

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

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

RDMA/rtrs: Add missing deinit() call

A warning is triggered when repeatedly connecting and disconnecting the
rnbd:
 list_add corruption. prev->next should be next (ffff88800b13e480), but was ffff88801ecd1338. (prev=ffff88801ecd1340).
 WARNING: CPU: 1 PID: 36562 at lib/list_debug.c:32 __list_add_valid_or_report+0x7f/0xa0
 Workqueue: ib_cm cm_work_handler [ib_cm]
 RIP: 0010:__list_add_valid_or_report+0x7f/0xa0
  ? __list_add_valid_or_report+0x7f/0xa0
  ib_register_event_handler+0x65/0x93 [ib_core]
  rtrs_srv_ib_dev_init+0x29/0x30 [rtrs_server]
  rtrs_ib_dev_find_or_add+0x124/0x1d0 [rtrs_core]
  __alloc_path+0x46c/0x680 [rtrs_server]
  ? rtrs_rdma_connect+0xa6/0x2d0 [rtrs_server]
  ? rcu_is_watching+0xd/0x40
  ? __mutex_lock+0x312/0xcf0
  ? get_or_create_srv+0xad/0x310 [rtrs_server]
  ? rtrs_rdma_connect+0xa6/0x2d0 [rtrs_server]
  rtrs_rdma_connect+0x23c/0x2d0 [rtrs_server]
  ? __lock_release+0x1b1/0x2d0
  cma_cm_event_handler+0x4a/0x1a0 [rdma_cm]
  cma_ib_req_handler+0x3a0/0x7e0 [rdma_cm]
  cm_process_work+0x28/0x1a0 [ib_cm]
  ? _raw_spin_unlock_irq+0x2f/0x50
  cm_req_handler+0x618/0xa60 [ib_cm]
  cm_work_handler+0x71/0x520 [ib_cm]

Commit 667db86bcbe8 ("RDMA/rtrs: Register ib event handler") introduced a
new element .deinit but never used it at all. Fix it by invoking the
`deinit()` to appropriately unregister the IB event handler.

The Linux kernel CVE team has assigned CVE-2025-21805 to this issue.

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

	Issue introduced in 6.12 with commit 667db86bcbe82e789d82c2e8c8c40756ec2e1999 and fixed in 6.12.13 with commit 5a79cc9bc961fafe90787f86e8f53ba6fad8d63b
	Issue introduced in 6.12 with commit 667db86bcbe82e789d82c2e8c8c40756ec2e1999 and fixed in 6.13.2 with commit 1af2c769032b6b334cd2a867d7d8c7cbbc527b2d
	Issue introduced in 6.12 with commit 667db86bcbe82e789d82c2e8c8c40756ec2e1999 and fixed in 6.14-rc1 with commit 81468c4058a62e84e475433b83b3edc613294f5e

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-2025-21805
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:
	drivers/infiniband/ulp/rtrs/rtrs.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/5a79cc9bc961fafe90787f86e8f53ba6fad8d63b
	https://git.kernel.org/stable/c/1af2c769032b6b334cd2a867d7d8c7cbbc527b2d
	https://git.kernel.org/stable/c/81468c4058a62e84e475433b83b3edc613294f5e