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    Subject[PATCH 5.10 430/593] RDMA/mlx5: Dont access NULL-cleared mpi pointer
    Date
    From: Leon Romanovsky <leonro@nvidia.com>

    [ Upstream commit 4a754d7637026b42b0c9ba5787ad5ee3bc2ff77f ]

    The "dev->port[i].mp.mpi" is set to NULL during mlx5_ib_unbind_slave_port()
    execution, however that field is needed to add device to unaffiliated list.

    Such flow causes to the following kernel panic while unloading mlx5_ib
    module in multi-port mode, hence the device should be added to the list
    prior to unbind call.

    RPC: Unregistered rdma transport module.
    RPC: Unregistered rdma backchannel transport module.
    BUG: kernel NULL pointer dereference, address: 0000000000000000
    #PF: supervisor write access in kernel mode
    #PF: error_code(0x0002) - not-present page
    PGD 0 P4D 0
    Oops: 0002 [#1] SMP NOPTI
    CPU: 4 PID: 1904 Comm: modprobe Not tainted 5.13.0-rc7_for_upstream_min_debug_2021_06_24_12_08 #1
    Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014
    RIP: 0010:mlx5_ib_cleanup_multiport_master+0x18b/0x2d0 [mlx5_ib]
    Code: 00 04 0f 85 c4 00 00 00 48 89 df e8 ef fa ff ff 48 8b 83 40 0d 00 00 48 8b 15 b9 e8 05 00 4a 8b 44 28 20 48 89 05 ad e8 05 00 <48> c7 00 d0 57 c5 a0 48 89 50 08 48 89 02 39 ab 88 0a 00 00 0f 86
    RSP: 0018:ffff888116ee3df8 EFLAGS: 00010296
    RAX: 0000000000000000 RBX: ffff8881154f6000 RCX: 0000000000000080
    RDX: ffffffffa0c557d0 RSI: ffff88810b69d200 RDI: 000000000002d8a0
    RBP: 0000000000000002 R08: ffff888110780408 R09: 0000000000000000
    R10: ffff88812452e1c0 R11: fffffffffff7e028 R12: 0000000000000000
    R13: 0000000000000080 R14: ffff888102c58000 R15: 0000000000000000
    FS: 00007f884393a740(0000) GS:ffff8882f5a00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000000 CR3: 00000001249f6004 CR4: 0000000000370ea0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    mlx5_ib_stage_init_cleanup+0x16/0xd0 [mlx5_ib]
    __mlx5_ib_remove+0x33/0x90 [mlx5_ib]
    mlx5r_remove+0x22/0x30 [mlx5_ib]
    auxiliary_bus_remove+0x18/0x30
    __device_release_driver+0x177/0x220
    driver_detach+0xc4/0x100
    bus_remove_driver+0x58/0xd0
    auxiliary_driver_unregister+0x12/0x20
    mlx5_ib_cleanup+0x13/0x897 [mlx5_ib]
    __x64_sys_delete_module+0x154/0x230
    ? exit_to_user_mode_prepare+0x104/0x140
    do_syscall_64+0x3f/0x80
    entry_SYSCALL_64_after_hwframe+0x44/0xae
    RIP: 0033:0x7f8842e095c7
    Code: 73 01 c3 48 8b 0d d9 48 2c 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 b0 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a9 48 2c 00 f7 d8 64 89 01 48
    RSP: 002b:00007ffc68f6e758 EFLAGS: 00000206 ORIG_RAX: 00000000000000b0
    RAX: ffffffffffffffda RBX: 00005638207929c0 RCX: 00007f8842e095c7
    RDX: 0000000000000000 RSI: 0000000000000800 RDI: 0000563820792a28
    RBP: 00005638207929c0 R08: 00007ffc68f6d701 R09: 0000000000000000
    R10: 00007f8842e82880 R11: 0000000000000206 R12: 0000563820792a28
    R13: 0000000000000001 R14: 0000563820792a28 R15: 00007ffc68f6fb40
    Modules linked in: xt_MASQUERADE nf_conntrack_netlink nfnetlink iptable_nat xt_addrtype xt_conntrack nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 br_netfilter overlay rdma_ucm ib_iser libiscsi scsi_transport_iscsi rdma_cm iw_cm ib_ipoib ib_cm ib_umad mlx5_ib(-) mlx4_ib ib_uverbs ib_core mlx4_en mlx4_core mlx5_core ptp pps_core [last unloaded: rpcrdma]
    CR2: 0000000000000000
    ---[ end trace a0bb7e20804e9e9b ]---

    Fixes: 7ce6095e3bff ("RDMA/mlx5: Don't add slave port to unaffiliated list")
    Link: https://lore.kernel.org/r/899ac1b33a995be5ec0e16a4765c4e43c2b1ba5b.1624956444.git.leonro@nvidia.com
    Reviewed-by: Itay Aveksis <itayav@nvidia.com>
    Reviewed-by: Maor Gottlieb <maorg@nvidia.com>
    Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/infiniband/hw/mlx5/main.c | 2 +-
    1 file changed, 1 insertion(+), 1 deletion(-)

    diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
    index 60aceb3b47a5..eb69bec77e5d 100644
    --- a/drivers/infiniband/hw/mlx5/main.c
    +++ b/drivers/infiniband/hw/mlx5/main.c
    @@ -3592,9 +3592,9 @@ static void mlx5_ib_cleanup_multiport_master(struct mlx5_ib_dev *dev)
    dev->port[i].mp.mpi = NULL;
    } else {
    mlx5_ib_dbg(dev, "unbinding port_num: %d\n", i + 1);
    - mlx5_ib_unbind_slave_port(dev, dev->port[i].mp.mpi);
    list_add_tail(&dev->port[i].mp.mpi->list,
    &mlx5_ib_unaffiliated_port_list);
    + mlx5_ib_unbind_slave_port(dev, dev->port[i].mp.mpi);
    }
    }
    }
    --
    2.30.2


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