CVE-2022-49670

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

linux/dim: Fix divide by 0 in RDMA DIM

Fix a divide 0 error in rdma_dim_stats_compare() when prev->cpe_ratio ==

0.

CallTrace:

Hardware name: H3C R4900 G3/RS33M2C9S, BIOS 2.00.37P21 03/12/2020

task: ffff880194b78000 task.stack: ffffc90006714000

RIP: 0010:backport_rdma_dim+0x10e/0x240 [mlx_compat]

RSP: 0018:ffff880c10e83ec0 EFLAGS: 00010202

RAX: 0000000000002710 RBX: ffff88096cd7f780 RCX: 0000000000000064

RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000001

RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000

R10: 0000000000000000 R11: 0000000000000000 R12: 000000001d7c6c09

R13: ffff88096cd7f780 R14: ffff880b174fe800 R15: 0000000000000000

FS: 0000000000000000(0000) GS:ffff880c10e80000(0000)

knlGS:0000000000000000

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

CR2: 00000000a0965b00 CR3: 000000000200a003 CR4: 00000000007606e0

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000

DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

PKRU: 55555554

Call Trace:

<IRQ>

ib_poll_handler+0x43/0x80 [ib_core]

irq_poll_softirq+0xae/0x110

__do_softirq+0xd1/0x28c

irq_exit+0xde/0xf0

do_IRQ+0x54/0xe0

common_interrupt+0x8f/0x8f

</IRQ>

? cpuidle_enter_state+0xd9/0x2a0

? cpuidle_enter_state+0xc7/0x2a0

? do_idle+0x170/0x1d0

? cpu_startup_entry+0x6f/0x80

? start_secondary+0x1b9/0x210

? secondary_startup_64+0xa5/0xb0

Code: 0f 87 e1 00 00 00 8b 4c 24 14 44 8b 43 14 89 c8 4d 63 c8 44 29 c0 99 31 d0 29 d0 31 d2 48 98 48 8d 04 80 48 8d 04 80 48 c1 e0 02 <49> f7 f1 48 83 f8 0a 0f 86 c1 00 00 00 44 39 c1 7f 10 48 89 df

RIP: backport_rdma_dim+0x10e/0x240 [mlx_compat] RSP: ffff880c10e83ec0