Subject: CVE-2022-48715: scsi: bnx2fc: Make bnx2fc_recv_frame() mp safe

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

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

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

scsi: bnx2fc: Make bnx2fc_recv_frame() mp safe

Running tests with a debug kernel shows that bnx2fc_recv_frame() is
modifying the per_cpu lport stats counters in a non-mpsafe way.  Just boot
a debug kernel and run the bnx2fc driver with the hardware enabled.

[ 1391.699147] BUG: using smp_processor_id() in preemptible [00000000] code: bnx2fc_
[ 1391.699160] caller is bnx2fc_recv_frame+0xbf9/0x1760 [bnx2fc]
[ 1391.699174] CPU: 2 PID: 4355 Comm: bnx2fc_l2_threa Kdump: loaded Tainted: G    B
[ 1391.699180] Hardware name: HP ProLiant DL120 G7, BIOS J01 07/01/2013
[ 1391.699183] Call Trace:
[ 1391.699188]  dump_stack_lvl+0x57/0x7d
[ 1391.699198]  check_preemption_disabled+0xc8/0xd0
[ 1391.699205]  bnx2fc_recv_frame+0xbf9/0x1760 [bnx2fc]
[ 1391.699215]  ? do_raw_spin_trylock+0xb5/0x180
[ 1391.699221]  ? bnx2fc_npiv_create_vports.isra.0+0x4e0/0x4e0 [bnx2fc]
[ 1391.699229]  ? bnx2fc_l2_rcv_thread+0xb7/0x3a0 [bnx2fc]
[ 1391.699240]  bnx2fc_l2_rcv_thread+0x1af/0x3a0 [bnx2fc]
[ 1391.699250]  ? bnx2fc_ulp_init+0xc0/0xc0 [bnx2fc]
[ 1391.699258]  kthread+0x364/0x420
[ 1391.699263]  ? _raw_spin_unlock_irq+0x24/0x50
[ 1391.699268]  ? set_kthread_struct+0x100/0x100
[ 1391.699273]  ret_from_fork+0x22/0x30

Restore the old get_cpu/put_cpu code with some modifications to reduce the
size of the critical section.

The Linux kernel CVE team has assigned CVE-2022-48715 to this issue.

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

	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 4.9.300 with commit 3a345198a7c2
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 4.14.265 with commit 471085571f92
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 4.19.228 with commit 003bcee66a8f
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 5.4.178 with commit 53e4f71763c6
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 5.10.99 with commit ec4334152dae
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 5.15.22 with commit 2f5a1ac68bdf
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 5.16.8 with commit 2d24336c7214
	Issue introduced in 3.16 with commit d576a5e80cd0 and fixed in 5.17 with commit 936bd03405fc

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-2022-48715
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/scsi/bnx2fc/bnx2fc_fcoe.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/3a345198a7c2d1db2526dc60b77052f75de019d3
	https://git.kernel.org/stable/c/471085571f926a1fe6b1bed095638994dbf23990
	https://git.kernel.org/stable/c/003bcee66a8f0e76157eb3af369c173151901d97
	https://git.kernel.org/stable/c/53e4f71763c61a557283eb43301efd671922d1e8
	https://git.kernel.org/stable/c/ec4334152dae175dbd8fd5bde1d2139bbe7b42d0
	https://git.kernel.org/stable/c/2f5a1ac68bdf2899ce822ab845081922ea8c588e
	https://git.kernel.org/stable/c/2d24336c7214b281b51860e54783dfc65f1248df
	https://git.kernel.org/stable/c/936bd03405fc83ba039d42bc93ffd4b88418f1d3