linux-cve-announce - CVE-2022-50054: iavf: Fix NULL pointer dereference in iavf_get_link

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Message-ID: <2025061847-CVE-2022-50054-a29e@gregkh>
Date: Wed, 18 Jun 2025 13:01:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50054: iavf: Fix NULL pointer dereference in iavf_get_link_ksettings

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

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

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

iavf: Fix NULL pointer dereference in iavf_get_link_ksettings

Fix possible NULL pointer dereference, due to freeing of adapter->vf_res
in iavf_init_get_resources. Previous commit introduced a regression,
where receiving IAVF_ERR_ADMIN_QUEUE_NO_WORK from iavf_get_vf_config
would free adapter->vf_res. However, netdev is still registered, so
ethtool_ops can be called. Calling iavf_get_link_ksettings with no vf_res,
will result with:
[ 9385.242676] BUG: kernel NULL pointer dereference, address: 0000000000000008
[ 9385.242683] #PF: supervisor read access in kernel mode
[ 9385.242686] #PF: error_code(0x0000) - not-present page
[ 9385.242690] PGD 0 P4D 0
[ 9385.242696] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC PTI
[ 9385.242701] CPU: 6 PID: 3217 Comm: pmdalinux Kdump: loaded Tainted: G S          E     5.18.0-04958-ga54ce3703613-dirty #1
[ 9385.242708] Hardware name: Dell Inc. PowerEdge R730/0WCJNT, BIOS 2.11.0 11/02/2019
[ 9385.242710] RIP: 0010:iavf_get_link_ksettings+0x29/0xd0 [iavf]
[ 9385.242745] Code: 00 0f 1f 44 00 00 b8 01 ef ff ff 48 c7 46 30 00 00 00 00 48 c7 46 38 00 00 00 00 c6 46 0b 00 66 89 46 08 48 8b 87 68 0e 00 00 <f6> 40 08 80 75 50 8b 87 5c 0e 00 00 83 f8 08 74 7a 76 1d 83 f8 20
[ 9385.242749] RSP: 0018:ffffc0560ec7fbd0 EFLAGS: 00010246
[ 9385.242755] RAX: 0000000000000000 RBX: ffffc0560ec7fc08 RCX: 0000000000000000
[ 9385.242759] RDX: ffffffffc0ad4550 RSI: ffffc0560ec7fc08 RDI: ffffa0fc66674000
[ 9385.242762] RBP: 00007ffd1fb2bf50 R08: b6a2d54b892363ee R09: ffffa101dc14fb00
[ 9385.242765] R10: 0000000000000000 R11: 0000000000000004 R12: ffffa0fc66674000
[ 9385.242768] R13: 0000000000000000 R14: ffffa0fc66674000 R15: 00000000ffffffa1
[ 9385.242771] FS:  00007f93711a2980(0000) GS:ffffa0fad72c0000(0000) knlGS:0000000000000000
[ 9385.242775] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 9385.242778] CR2: 0000000000000008 CR3: 0000000a8e61c003 CR4: 00000000003706e0
[ 9385.242781] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 9385.242784] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 9385.242787] Call Trace:
[ 9385.242791]  <TASK>
[ 9385.242793]  ethtool_get_settings+0x71/0x1a0
[ 9385.242814]  __dev_ethtool+0x426/0x2f40
[ 9385.242823]  ? slab_post_alloc_hook+0x4f/0x280
[ 9385.242836]  ? kmem_cache_alloc_trace+0x15d/0x2f0
[ 9385.242841]  ? dev_ethtool+0x59/0x170
[ 9385.242848]  dev_ethtool+0xa7/0x170
[ 9385.242856]  dev_ioctl+0xc3/0x520
[ 9385.242866]  sock_do_ioctl+0xa0/0xe0
[ 9385.242877]  sock_ioctl+0x22f/0x320
[ 9385.242885]  __x64_sys_ioctl+0x84/0xc0
[ 9385.242896]  do_syscall_64+0x3a/0x80
[ 9385.242904]  entry_SYSCALL_64_after_hwframe+0x46/0xb0
[ 9385.242918] RIP: 0033:0x7f93702396db
[ 9385.242923] Code: 73 01 c3 48 8b 0d ad 57 38 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 7d 57 38 00 f7 d8 64 89 01 48
[ 9385.242927] RSP: 002b:00007ffd1fb2bf18 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 9385.242932] RAX: ffffffffffffffda RBX: 000055671b1d2fe0 RCX: 00007f93702396db
[ 9385.242935] RDX: 00007ffd1fb2bf20 RSI: 0000000000008946 RDI: 0000000000000007
[ 9385.242937] RBP: 00007ffd1fb2bf20 R08: 0000000000000003 R09: 0030763066307330
[ 9385.242940] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd1fb2bf80
[ 9385.242942] R13: 0000000000000007 R14: 0000556719f6de90 R15: 00007ffd1fb2c1b0
[ 9385.242948]  </TASK>
[ 9385.242949] Modules linked in: iavf(E) xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nft_compat nf_nat_tftp nft_objref nf_conntrack_tftp bridge stp llc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip_set nf_tables rfkill nfnetlink vfat fat irdma ib_uverbs ib_core intel_rapl_msr intel_rapl_common sb_edac x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm iTCO_wdt iTCO_vendor_support ice irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel rapl i40e pcspkr intel_cstate joydev mei_me intel_uncore mxm_wmi mei ipmi_ssif lpc_ich ipmi_si acpi_power_meter xfs libcrc32c mgag200 i2c_algo_bit drm_shmem_helper drm_kms_helper sd_mod t10_pi crc64_rocksoft crc64 syscopyarea sg sysfillrect sysimgblt fb_sys_fops drm ixgbe ahci libahci libata crc32c_intel mdio dca wmi dm_mirror dm_region_hash dm_log dm_mod ipmi_devintf ipmi_msghandler fuse
[ 9385.243065]  [last unloaded: iavf]

Dereference happens in if (ADV_LINK_SUPPORT(adapter)) statement

The Linux kernel CVE team has assigned CVE-2022-50054 to this issue.


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

	Issue introduced in 5.17 with commit 209f2f9c718138ddbd8586e5a1463bd079a17241 and fixed in 5.19.4 with commit b305c7e9363f5a174ee08ac5f056e4b209f0325b
	Issue introduced in 5.17 with commit 209f2f9c718138ddbd8586e5a1463bd079a17241 and fixed in 6.0 with commit 541a1af451b0cb3779e915d48d08efb17915207b

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-2022-50054
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/intel/iavf/iavf_main.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/b305c7e9363f5a174ee08ac5f056e4b209f0325b
	https://git.kernel.org/stable/c/541a1af451b0cb3779e915d48d08efb17915207b