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    Subject[PATCH 5.12 009/127] RDMA/rxe: Clear all QP fields if creation failed
    Date
    From: Leon Romanovsky <leonro@nvidia.com>

    [ Upstream commit 67f29896fdc83298eed5a6576ff8f9873f709228 ]

    rxe_qp_do_cleanup() relies on valid pointer values in QP for the properly
    created ones, but in case rxe_qp_from_init() failed it was filled with
    garbage and caused tot the following error.

    refcount_t: underflow; use-after-free.
    WARNING: CPU: 1 PID: 12560 at lib/refcount.c:28 refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28
    Modules linked in:
    CPU: 1 PID: 12560 Comm: syz-executor.4 Not tainted 5.12.0-syzkaller #0
    Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
    RIP: 0010:refcount_warn_saturate+0x1d1/0x1e0 lib/refcount.c:28
    Code: e9 db fe ff ff 48 89 df e8 2c c2 ea fd e9 8a fe ff ff e8 72 6a a7 fd 48 c7 c7 e0 b2 c1 89 c6 05 dc 3a e6 09 01 e8 ee 74 fb 04 <0f> 0b e9 af fe ff ff 0f 1f 84 00 00 00 00 00 41 56 41 55 41 54 55
    RSP: 0018:ffffc900097ceba8 EFLAGS: 00010286
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
    RDX: 0000000000040000 RSI: ffffffff815bb075 RDI: fffff520012f9d67
    RBP: 0000000000000003 R08: 0000000000000000 R09: 0000000000000000
    R10: ffffffff815b4eae R11: 0000000000000000 R12: ffff8880322a4800
    R13: ffff8880322a4940 R14: ffff888033044e00 R15: 0000000000000000
    FS: 00007f6eb2be3700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    CR2: 00007fdbe5d41000 CR3: 000000001d181000 CR4: 00000000001506e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
    Call Trace:
    __refcount_sub_and_test include/linux/refcount.h:283 [inline]
    __refcount_dec_and_test include/linux/refcount.h:315 [inline]
    refcount_dec_and_test include/linux/refcount.h:333 [inline]
    kref_put include/linux/kref.h:64 [inline]
    rxe_qp_do_cleanup+0x96f/0xaf0 drivers/infiniband/sw/rxe/rxe_qp.c:805
    execute_in_process_context+0x37/0x150 kernel/workqueue.c:3327
    rxe_elem_release+0x9f/0x180 drivers/infiniband/sw/rxe/rxe_pool.c:391
    kref_put include/linux/kref.h:65 [inline]
    rxe_create_qp+0x2cd/0x310 drivers/infiniband/sw/rxe/rxe_verbs.c:425
    _ib_create_qp drivers/infiniband/core/core_priv.h:331 [inline]
    ib_create_named_qp+0x2ad/0x1370 drivers/infiniband/core/verbs.c:1231
    ib_create_qp include/rdma/ib_verbs.h:3644 [inline]
    create_mad_qp+0x177/0x2d0 drivers/infiniband/core/mad.c:2920
    ib_mad_port_open drivers/infiniband/core/mad.c:3001 [inline]
    ib_mad_init_device+0xd6f/0x1400 drivers/infiniband/core/mad.c:3092
    add_client_context+0x405/0x5e0 drivers/infiniband/core/device.c:717
    enable_device_and_get+0x1cd/0x3b0 drivers/infiniband/core/device.c:1331
    ib_register_device drivers/infiniband/core/device.c:1413 [inline]
    ib_register_device+0x7c7/0xa50 drivers/infiniband/core/device.c:1365
    rxe_register_device+0x3d5/0x4a0 drivers/infiniband/sw/rxe/rxe_verbs.c:1147
    rxe_add+0x12fe/0x16d0 drivers/infiniband/sw/rxe/rxe.c:247
    rxe_net_add+0x8c/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:503
    rxe_newlink drivers/infiniband/sw/rxe/rxe.c:269 [inline]
    rxe_newlink+0xb7/0xe0 drivers/infiniband/sw/rxe/rxe.c:250
    nldev_newlink+0x30e/0x550 drivers/infiniband/core/nldev.c:1555
    rdma_nl_rcv_msg+0x36d/0x690 drivers/infiniband/core/netlink.c:195
    rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline]
    rdma_nl_rcv+0x2ee/0x430 drivers/infiniband/core/netlink.c:259
    netlink_unicast_kernel net/netlink/af_netlink.c:1312 [inline]
    netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1338
    netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1927
    sock_sendmsg_nosec net/socket.c:654 [inline]
    sock_sendmsg+0xcf/0x120 net/socket.c:674
    ____sys_sendmsg+0x6e8/0x810 net/socket.c:2350
    ___sys_sendmsg+0xf3/0x170 net/socket.c:2404
    __sys_sendmsg+0xe5/0x1b0 net/socket.c:2433
    do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
    entry_SYSCALL_64_after_hwframe+0x44/0xae

    Fixes: 8700e3e7c485 ("Soft RoCE driver")
    Link: https://lore.kernel.org/r/7bf8d548764d406dbbbaf4b574960ebfd5af8387.1620717918.git.leonro@nvidia.com
    Reported-by: syzbot+36a7f280de4e11c6f04e@syzkaller.appspotmail.com
    Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
    Reviewed-by: Zhu Yanjun <zyjzyj2000@gmail.com>
    Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/infiniband/sw/rxe/rxe_qp.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/drivers/infiniband/sw/rxe/rxe_qp.c b/drivers/infiniband/sw/rxe/rxe_qp.c
    index 34ae957a315c..b0f350d674fd 100644
    --- a/drivers/infiniband/sw/rxe/rxe_qp.c
    +++ b/drivers/infiniband/sw/rxe/rxe_qp.c
    @@ -242,6 +242,7 @@ static int rxe_qp_init_req(struct rxe_dev *rxe, struct rxe_qp *qp,
    if (err) {
    vfree(qp->sq.queue->buf);
    kfree(qp->sq.queue);
    + qp->sq.queue = NULL;
    return err;
    }

    @@ -295,6 +296,7 @@ static int rxe_qp_init_resp(struct rxe_dev *rxe, struct rxe_qp *qp,
    if (err) {
    vfree(qp->rq.queue->buf);
    kfree(qp->rq.queue);
    + qp->rq.queue = NULL;
    return err;
    }
    }
    @@ -355,6 +357,11 @@ int rxe_qp_from_init(struct rxe_dev *rxe, struct rxe_qp *qp, struct rxe_pd *pd,
    err2:
    rxe_queue_cleanup(qp->sq.queue);
    err1:
    + qp->pd = NULL;
    + qp->rcq = NULL;
    + qp->scq = NULL;
    + qp->srq = NULL;
    +
    if (srq)
    rxe_drop_ref(srq);
    rxe_drop_ref(scq);
    --
    2.30.2


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