Subject: CVE-2022-48729: IB/hfi1: Fix panic with larger ipoib send_queue_size

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

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

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

IB/hfi1: Fix panic with larger ipoib send_queue_size

When the ipoib send_queue_size is increased from the default the following
panic happens:

  RIP: 0010:hfi1_ipoib_drain_tx_ring+0x45/0xf0 [hfi1]
  Code: 31 e4 eb 0f 8b 85 c8 02 00 00 41 83 c4 01 44 39 e0 76 60 8b 8d cc 02 00 00 44 89 e3 be 01 00 00 00 d3 e3 48 03 9d c0 02 00 00 <c7> 83 18 01 00 00 00 00 00 00 48 8b bb 30 01 00 00 e8 25 af a7 e0
  RSP: 0018:ffffc9000798f4a0 EFLAGS: 00010286
  RAX: 0000000000008000 RBX: ffffc9000aa0f000 RCX: 000000000000000f
  RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
  RBP: ffff88810ff08000 R08: ffff88889476d900 R09: 0000000000000101
  R10: 0000000000000000 R11: ffffc90006590ff8 R12: 0000000000000200
  R13: ffffc9000798fba8 R14: 0000000000000000 R15: 0000000000000001
  FS:  00007fd0f79cc3c0(0000) GS:ffff88885fb00000(0000) knlGS:0000000000000000
  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  CR2: ffffc9000aa0f118 CR3: 0000000889c84001 CR4: 00000000001706e0
  Call Trace:
   <TASK>
   hfi1_ipoib_napi_tx_disable+0x45/0x60 [hfi1]
   hfi1_ipoib_dev_stop+0x18/0x80 [hfi1]
   ipoib_ib_dev_stop+0x1d/0x40 [ib_ipoib]
   ipoib_stop+0x48/0xc0 [ib_ipoib]
   __dev_close_many+0x9e/0x110
   __dev_change_flags+0xd9/0x210
   dev_change_flags+0x21/0x60
   do_setlink+0x31c/0x10f0
   ? __nla_validate_parse+0x12d/0x1a0
   ? __nla_parse+0x21/0x30
   ? inet6_validate_link_af+0x5e/0xf0
   ? cpumask_next+0x1f/0x20
   ? __snmp6_fill_stats64.isra.53+0xbb/0x140
   ? __nla_validate_parse+0x47/0x1a0
   __rtnl_newlink+0x530/0x910
   ? pskb_expand_head+0x73/0x300
   ? __kmalloc_node_track_caller+0x109/0x280
   ? __nla_put+0xc/0x20
   ? cpumask_next_and+0x20/0x30
   ? update_sd_lb_stats.constprop.144+0xd3/0x820
   ? _raw_spin_unlock_irqrestore+0x25/0x37
   ? __wake_up_common_lock+0x87/0xc0
   ? kmem_cache_alloc_trace+0x3d/0x3d0
   rtnl_newlink+0x43/0x60

The issue happens when the shift that should have been a function of the
txq item size mistakenly used the ring size.

Fix by using the item size.

The Linux kernel CVE team has assigned CVE-2022-48729 to this issue.

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

	Issue introduced in 5.16 with commit d47dfc2b00e6 and fixed in 5.16.8 with commit 1530d84fba1e
	Issue introduced in 5.16 with commit d47dfc2b00e6 and fixed in 5.17 with commit 8c83d39cc730

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-2022-48729
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/hw/hfi1/ipoib_tx.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/1530d84fba1e459ba55f46aa42649b88773210e7
	https://git.kernel.org/stable/c/8c83d39cc730378bbac64d67a551897b203a606e