CVE-2022-50472

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

IB/mad: Don't call to function that might sleep while in atomic context

Tracepoints are not allowed to sleep, as such the following splat is

generated due to call to ib_query_pkey() in atomic context.

WARNING: CPU: 0 PID: 1888000 at kernel/trace/ring_buffer.c:2492 rb_commit+0xc1/0x220

CPU: 0 PID: 1888000 Comm: kworker/u9:0 Kdump: loaded Tainted: G OE --------- - - 4.18.0-305.3.1.el8.x86_64 #1

Hardware name: Red Hat KVM, BIOS 1.13.0-2.module_el8.3.0+555+a55c8938 04/01/2014

Workqueue: ib-comp-unb-wq ib_cq_poll_work [ib_core]

RIP: 0010:rb_commit+0xc1/0x220

RSP: 0000:ffffa8ac80f9bca0 EFLAGS: 00010202

RAX: ffff8951c7c01300 RBX: ffff8951c7c14a00 RCX: 0000000000000246

RDX: ffff8951c707c000 RSI: ffff8951c707c57c RDI: ffff8951c7c14a00

RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000

R10: ffff8951c7c01300 R11: 0000000000000001 R12: 0000000000000246

R13: 0000000000000000 R14: ffffffff964c70c0 R15: 0000000000000000

FS: 0000000000000000(0000) GS:ffff8951fbc00000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f20e8f39010 CR3: 000000002ca10005 CR4: 0000000000170ef0

Call Trace:

ring_buffer_unlock_commit+0x1d/0xa0

trace_buffer_unlock_commit_regs+0x3b/0x1b0

trace_event_buffer_commit+0x67/0x1d0

trace_event_raw_event_ib_mad_recv_done_handler+0x11c/0x160 [ib_core]

ib_mad_recv_done+0x48b/0xc10 [ib_core]

? trace_event_raw_event_cq_poll+0x6f/0xb0 [ib_core]

__ib_process_cq+0x91/0x1c0 [ib_core]

ib_cq_poll_work+0x26/0x80 [ib_core]

process_one_work+0x1a7/0x360

? create_worker+0x1a0/0x1a0

worker_thread+0x30/0x390

? create_worker+0x1a0/0x1a0

kthread+0x116/0x130

? kthread_flush_work_fn+0x10/0x10

ret_from_fork+0x35/0x40

---[ end trace 78ba8509d3830a16 ]---