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    Subject[PATCH 5.10 117/575] RDMA/qedr: Fix NULL deref for query_qp on the GSI QP
    Date
    From: Alok Prasad <palok@marvell.com>

    commit 4f960393a0ee9a39469ceb7c8077ae8db665cc12 upstream.

    This patch fixes a crash caused by querying the QP via netlink, and
    corrects the state of GSI qp. GSI qp's have a NULL qed_qp.

    The call trace is generated by:
    $ rdma res show

    BUG: kernel NULL pointer dereference, address: 0000000000000034
    Hardware name: Dell Inc. PowerEdge R720/0M1GCR, BIOS 1.2.6 05/10/2012
    RIP: 0010:qed_rdma_query_qp+0x33/0x1a0 [qed]
    RSP: 0018:ffffba560a08f580 EFLAGS: 00010206
    RAX: 0000000200000000 RBX: ffffba560a08f5b8 RCX: 0000000000000000
    RDX: ffffba560a08f5b8 RSI: 0000000000000000 RDI: ffff9807ee458090
    RBP: ffffba560a08f5a0 R08: 0000000000000000 R09: ffff9807890e7048
    R10: ffffba560a08f658 R11: 0000000000000000 R12: 0000000000000000
    R13: ffff9807ee458090 R14: ffff9807f0afb000 R15: ffffba560a08f7ec
    FS: 00007fbbf8bfe740(0000) GS:ffff980aafa00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 0000000000000034 CR3: 00000001720ba001 CR4: 00000000000606f0
    Call Trace:
    qedr_query_qp+0x82/0x360 [qedr]
    ib_query_qp+0x34/0x40 [ib_core]
    ? ib_query_qp+0x34/0x40 [ib_core]
    fill_res_qp_entry_query.isra.26+0x47/0x1d0 [ib_core]
    ? __nla_put+0x20/0x30
    ? nla_put+0x33/0x40
    fill_res_qp_entry+0xe3/0x120 [ib_core]
    res_get_common_dumpit+0x3f8/0x5d0 [ib_core]
    ? fill_res_cm_id_entry+0x1f0/0x1f0 [ib_core]
    nldev_res_get_qp_dumpit+0x1a/0x20 [ib_core]
    netlink_dump+0x156/0x2f0
    __netlink_dump_start+0x1ab/0x260
    rdma_nl_rcv+0x1de/0x330 [ib_core]
    ? nldev_res_get_cm_id_dumpit+0x20/0x20 [ib_core]
    netlink_unicast+0x1b8/0x270
    netlink_sendmsg+0x33e/0x470
    sock_sendmsg+0x63/0x70
    __sys_sendto+0x13f/0x180
    ? setup_sgl.isra.12+0x70/0xc0
    __x64_sys_sendto+0x28/0x30
    do_syscall_64+0x3a/0xb0
    entry_SYSCALL_64_after_hwframe+0x44/0xae

    Cc: stable@vger.kernel.org
    Fixes: cecbcddf6461 ("qedr: Add support for QP verbs")
    Link: https://lore.kernel.org/r/20211027184329.18454-1-palok@marvell.com
    Signed-off-by: Ariel Elior <aelior@marvell.com>
    Signed-off-by: Shai Malin <smalin@marvell.com>
    Signed-off-by: Prabhakar Kushwaha <pkushwaha@marvell.com>
    Signed-off-by: Alok Prasad <palok@marvell.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/infiniband/hw/qedr/verbs.c | 15 +++++++++------
    1 file changed, 9 insertions(+), 6 deletions(-)

    --- a/drivers/infiniband/hw/qedr/verbs.c
    +++ b/drivers/infiniband/hw/qedr/verbs.c
    @@ -2744,15 +2744,18 @@ int qedr_query_qp(struct ib_qp *ibqp,
    int rc = 0;

    memset(&params, 0, sizeof(params));
    -
    - rc = dev->ops->rdma_query_qp(dev->rdma_ctx, qp->qed_qp, &params);
    - if (rc)
    - goto err;
    -
    memset(qp_attr, 0, sizeof(*qp_attr));
    memset(qp_init_attr, 0, sizeof(*qp_init_attr));

    - qp_attr->qp_state = qedr_get_ibqp_state(params.state);
    + if (qp->qp_type != IB_QPT_GSI) {
    + rc = dev->ops->rdma_query_qp(dev->rdma_ctx, qp->qed_qp, &params);
    + if (rc)
    + goto err;
    + qp_attr->qp_state = qedr_get_ibqp_state(params.state);
    + } else {
    + qp_attr->qp_state = qedr_get_ibqp_state(QED_ROCE_QP_STATE_RTS);
    + }
    +
    qp_attr->cur_qp_state = qedr_get_ibqp_state(params.state);
    qp_attr->path_mtu = ib_mtu_int_to_enum(params.mtu);
    qp_attr->path_mig_state = IB_MIG_MIGRATED;

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