Subject: CVE-2022-48652: ice: Fix crash by keep old cfg when update TCs more than queues

From: Greg Kroah-Hartman <[email-masked]>

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

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

ice: Fix crash by keep old cfg when update TCs more than queues

There are problems if allocated queues less than Traffic Classes.

Commit a632b2a4c920 ("ice: ethtool: Prohibit improper channel config
for DCB") already disallow setting less queues than TCs.

Another case is if we first set less queues, and later update more TCs
config due to LLDP, ice_vsi_cfg_tc() will failed but left dirty
num_txq/rxq and tc_cfg in vsi, that will cause invalid pointer access.

[   95.968089] ice 0000:3b:00.1: More TCs defined than queues/rings allocated.
[   95.968092] ice 0000:3b:00.1: Trying to use more Rx queues (8), than were allocated (1)!
[   95.968093] ice 0000:3b:00.1: Failed to config TC for VSI index: 0
[   95.969621] general protection fault: 0000 [#1] SMP NOPTI
[   95.969705] CPU: 1 PID: 58405 Comm: lldpad Kdump: loaded Tainted: G     U  W  O     --------- -t - 4.18.0 #1
[   95.969867] Hardware name: O.E.M/BC11SPSCB10, BIOS 8.23 12/30/2021
[   95.969992] RIP: 0010:devm_kmalloc+0xa/0x60
[   95.970052] Code: 5c ff ff ff 31 c0 5b 5d 41 5c c3 b8 f4 ff ff ff eb f4 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 89 d1 <8b> 97 60 02 00 00 48 8d 7e 18 48 39 f7 72 3f 55 89 ce 53 48 8b 4c
[   95.970344] RSP: 0018:ffffc9003f553888 EFLAGS: 00010206
[   95.970425] RAX: dead000000000200 RBX: ffffea003c425b00 RCX: 00000000006080c0
[   95.970536] RDX: 00000000006080c0 RSI: 0000000000000200 RDI: dead000000000200
[   95.970648] RBP: dead000000000200 R08: 00000000000463c0 R09: ffff888ffa900000
[   95.970760] R10: 0000000000000000 R11: 0000000000000002 R12: ffff888ff6b40100
[   95.970870] R13: ffff888ff6a55018 R14: 0000000000000000 R15: ffff888ff6a55460
[   95.970981] FS:  00007f51b7d24700(0000) GS:ffff88903ee80000(0000) knlGS:0000000000000000
[   95.971108] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   95.971197] CR2: 00007fac5410d710 CR3: 0000000f2c1de002 CR4: 00000000007606e0
[   95.971309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   95.971419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   95.971530] PKRU: 55555554
[   95.971573] Call Trace:
[   95.971622]  ice_setup_rx_ring+0x39/0x110 [ice]
[   95.971695]  ice_vsi_setup_rx_rings+0x54/0x90 [ice]
[   95.971774]  ice_vsi_open+0x25/0x120 [ice]
[   95.971843]  ice_open_internal+0xb8/0x1f0 [ice]
[   95.971919]  ice_ena_vsi+0x4f/0xd0 [ice]
[   95.971987]  ice_dcb_ena_dis_vsi.constprop.5+0x29/0x90 [ice]
[   95.972082]  ice_pf_dcb_cfg+0x29a/0x380 [ice]
[   95.972154]  ice_dcbnl_setets+0x174/0x1b0 [ice]
[   95.972220]  dcbnl_ieee_set+0x89/0x230
[   95.972279]  ? dcbnl_ieee_del+0x150/0x150
[   95.972341]  dcb_doit+0x124/0x1b0
[   95.972392]  rtnetlink_rcv_msg+0x243/0x2f0
[   95.972457]  ? dcb_doit+0x14d/0x1b0
[   95.972510]  ? __kmalloc_node_track_caller+0x1d3/0x280
[   95.972591]  ? rtnl_calcit.isra.31+0x100/0x100
[   95.972661]  netlink_rcv_skb+0xcf/0xf0
[   95.972720]  netlink_unicast+0x16d/0x220
[   95.972781]  netlink_sendmsg+0x2ba/0x3a0
[   95.975891]  sock_sendmsg+0x4c/0x50
[   95.979032]  ___sys_sendmsg+0x2e4/0x300
[   95.982147]  ? kmem_cache_alloc+0x13e/0x190
[   95.985242]  ? __wake_up_common_lock+0x79/0x90
[   95.988338]  ? __check_object_size+0xac/0x1b0
[   95.991440]  ? _copy_to_user+0x22/0x30
[   95.994539]  ? move_addr_to_user+0xbb/0xd0
[   95.997619]  ? __sys_sendmsg+0x53/0x80
[   96.000664]  __sys_sendmsg+0x53/0x80
[   96.003747]  do_syscall_64+0x5b/0x1d0
[   96.006862]  entry_SYSCALL_64_after_hwframe+0x65/0xca

Only update num_txq/rxq when passed check, and restore tc_cfg if setup
queue map failed.

The Linux kernel CVE team has assigned CVE-2022-48652 to this issue.

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

	Issue introduced in 5.19 with commit a632b2a4c920 and fixed in 5.19.12 with commit 7c945e5b4787
	Issue introduced in 5.19 with commit a632b2a4c920 and fixed in 6.0 with commit a509702cac95
	Issue introduced in 5.18.8 with commit 4520c4bf4dca

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-2022-48652
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/ice/ice_lib.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/7c945e5b4787db47d728120b56c934ba05f99864
	https://git.kernel.org/stable/c/a509702cac95a8b450228a037c8542f57e538e5b