linux-cve-announce - CVE-2022-49869: bnxt_en: Fix possible crash in bnxt_hwrm_set

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Message-ID: <2025050150-CVE-2022-49869-487b@gregkh>
Date: Thu,  1 May 2025 16:10:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49869: bnxt_en: Fix possible crash in bnxt_hwrm_set_coal()

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

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

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

bnxt_en: Fix possible crash in bnxt_hwrm_set_coal()

During the error recovery sequence, the rtnl_lock is not held for the
entire duration and some datastructures may be freed during the sequence.
Check for the BNXT_STATE_OPEN flag instead of netif_running() to ensure
that the device is fully operational before proceeding to reconfigure
the coalescing settings.

This will fix a possible crash like this:

BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 10 PID: 181276 Comm: ethtool Kdump: loaded Tainted: G          IOE    --------- -  - 4.18.0-348.el8.x86_64 #1
Hardware name: Dell Inc. PowerEdge R740/0F9N89, BIOS 2.3.10 08/15/2019
RIP: 0010:bnxt_hwrm_set_coal+0x1fb/0x2a0 [bnxt_en]
Code: c2 66 83 4e 22 08 66 89 46 1c e8 10 cb 00 00 41 83 c6 01 44 39 b3 68 01 00 00 0f 8e a3 00 00 00 48 8b 93 c8 00 00 00 49 63 c6 <48> 8b 2c c2 48 8b 85 b8 02 00 00 48 85 c0 74 2e 48 8b 74 24 08 f6
RSP: 0018:ffffb11c8dcaba50 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8d168a8b0ac0 RCX: 00000000000000c5
RDX: 0000000000000000 RSI: ffff8d162f72c000 RDI: ffff8d168a8b0b28
RBP: 0000000000000000 R08: b6e1f68a12e9a7eb R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000037 R12: ffff8d168a8b109c
R13: ffff8d168a8b10aa R14: 0000000000000000 R15: ffffffffc01ac4e0
FS:  00007f3852e4c740(0000) GS:ffff8d24c0080000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000041b3ee003 CR4: 00000000007706e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 ethnl_set_coalesce+0x3ce/0x4c0
 genl_family_rcv_msg_doit.isra.15+0x10f/0x150
 genl_family_rcv_msg+0xb3/0x160
 ? coalesce_fill_reply+0x480/0x480
 genl_rcv_msg+0x47/0x90
 ? genl_family_rcv_msg+0x160/0x160
 netlink_rcv_skb+0x4c/0x120
 genl_rcv+0x24/0x40
 netlink_unicast+0x196/0x230
 netlink_sendmsg+0x204/0x3d0
 sock_sendmsg+0x4c/0x50
 __sys_sendto+0xee/0x160
 ? syscall_trace_enter+0x1d3/0x2c0
 ? __audit_syscall_exit+0x249/0x2a0
 __x64_sys_sendto+0x24/0x30
 do_syscall_64+0x5b/0x1a0
 entry_SYSCALL_64_after_hwframe+0x65/0xca
RIP: 0033:0x7f38524163bb

The Linux kernel CVE team has assigned CVE-2022-49869 to this issue.


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

	Issue introduced in 5.4 with commit 2151fe0830fdb951f8ecfcfe67306fdef2366aa0 and fixed in 5.4.225 with commit a5a05fbef4a0dfe45fe03b2f1d02ba23aebf5384
	Issue introduced in 5.4 with commit 2151fe0830fdb951f8ecfcfe67306fdef2366aa0 and fixed in 5.10.155 with commit 38147073c96dce8c7e142ce0e5f305a420a729ba
	Issue introduced in 5.4 with commit 2151fe0830fdb951f8ecfcfe67306fdef2366aa0 and fixed in 5.15.79 with commit ac257c43fa615d22180916074feed803b8bb8cb0
	Issue introduced in 5.4 with commit 2151fe0830fdb951f8ecfcfe67306fdef2366aa0 and fixed in 6.0.9 with commit 7781e32984cde65549bedc3201537e253297c98d
	Issue introduced in 5.4 with commit 2151fe0830fdb951f8ecfcfe67306fdef2366aa0 and fixed in 6.1 with commit 6d81ea3765dfa6c8a20822613c81edad1c4a16a0

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-2022-49869
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/broadcom/bnxt/bnxt_ethtool.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/a5a05fbef4a0dfe45fe03b2f1d02ba23aebf5384
	https://git.kernel.org/stable/c/38147073c96dce8c7e142ce0e5f305a420a729ba
	https://git.kernel.org/stable/c/ac257c43fa615d22180916074feed803b8bb8cb0
	https://git.kernel.org/stable/c/7781e32984cde65549bedc3201537e253297c98d
	https://git.kernel.org/stable/c/6d81ea3765dfa6c8a20822613c81edad1c4a16a0