linux-cve-announce - CVE-2023-53105: net/mlx5e: Fix cleanup null-ptr deref on encap lock

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Message-ID: <2025050225-CVE-2023-53105-7c94@gregkh>
Date: Fri,  2 May 2025 17:56:10 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53105: net/mlx5e: Fix cleanup null-ptr deref on encap lock

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

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

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

net/mlx5e: Fix cleanup null-ptr deref on encap lock

During module is unloaded while a peer tc flow is still offloaded,
first the peer uplink rep profile is changed to a nic profile, and so
neigh encap lock is destroyed. Next during unload, the VF reps netdevs
are unregistered which causes the original non-peer tc flow to be deleted,
which deletes the peer flow. The peer flow deletion detaches the encap
entry and try to take the already destroyed encap lock, causing the
below trace.

Fix this by clearing peer flows during tc eswitch cleanup
(mlx5e_tc_esw_cleanup()).

Relevant trace:
[ 4316.837128] BUG: kernel NULL pointer dereference, address: 00000000000001d8
[ 4316.842239] RIP: 0010:__mutex_lock+0xb5/0xc40
[ 4316.851897] Call Trace:
[ 4316.852481]  <TASK>
[ 4316.857214]  mlx5e_rep_neigh_entry_release+0x93/0x790 [mlx5_core]
[ 4316.858258]  mlx5e_rep_encap_entry_detach+0xa7/0xf0 [mlx5_core]
[ 4316.859134]  mlx5e_encap_dealloc+0xa3/0xf0 [mlx5_core]
[ 4316.859867]  clean_encap_dests.part.0+0x5c/0xe0 [mlx5_core]
[ 4316.860605]  mlx5e_tc_del_fdb_flow+0x32a/0x810 [mlx5_core]
[ 4316.862609]  __mlx5e_tc_del_fdb_peer_flow+0x1a2/0x250 [mlx5_core]
[ 4316.863394]  mlx5e_tc_del_flow+0x(/0x630 [mlx5_core]
[ 4316.864090]  mlx5e_flow_put+0x5f/0x100 [mlx5_core]
[ 4316.864771]  mlx5e_delete_flower+0x4de/0xa40 [mlx5_core]
[ 4316.865486]  tc_setup_cb_reoffload+0x20/0x80
[ 4316.865905]  fl_reoffload+0x47c/0x510 [cls_flower]
[ 4316.869181]  tcf_block_playback_offloads+0x91/0x1d0
[ 4316.869649]  tcf_block_unbind+0xe7/0x1b0
[ 4316.870049]  tcf_block_offload_cmd.isra.0+0x1ee/0x270
[ 4316.879266]  tcf_block_offload_unbind+0x61/0xa0
[ 4316.879711]  __tcf_block_put+0xa4/0x310

The Linux kernel CVE team has assigned CVE-2023-53105 to this issue.


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

	Issue introduced in 5.0 with commit 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d and fixed in 6.1.21 with commit b7350f8dbe0c2a1d4d3ad7c35b610abd3cb91750
	Issue introduced in 5.0 with commit 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d and fixed in 6.2.8 with commit 01fdaea410787fe372daeaeda93a29ed0606d334
	Issue introduced in 5.0 with commit 04de7dda7394fa9c2b0fc9cec65661d9b4f0d04d and fixed in 6.3 with commit c9668f0b1d28570327dbba189f2c61f6f9e43ae7

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-2023-53105
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/net/ethernet/mellanox/mlx5/core/en_tc.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/b7350f8dbe0c2a1d4d3ad7c35b610abd3cb91750
	https://git.kernel.org/stable/c/01fdaea410787fe372daeaeda93a29ed0606d334
	https://git.kernel.org/stable/c/c9668f0b1d28570327dbba189f2c61f6f9e43ae7