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RDMA/srpt: Do not register event handler until srpt device is fully setup

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Upon rare occasions, KASAN reports a use-after-free Write
in srpt_refresh_port().

This seems to be because an event handler is registered before the
srpt device is fully setup and a race condition upon error may leave a
partially setup event handler in place.

Instead, only register the event handler after srpt device initialization
is complete.

Fixes: a42d985bd5 ("ib_srpt: Initial SRP Target merge for v3.3-rc1")
Signed-off-by: William Kucharski <william.kucharski@oracle.com>
Link: https://lore.kernel.org/r/20240202091549.991784-2-william.kucharski@oracle.com
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
William Kucharski 2024-02-02 02:15:49 -07:00 committed by Leon Romanovsky
parent 926e8ea4b8
commit c21a8870c9
1 changed files with 1 additions and 2 deletions
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3
drivers/infiniband/ulp/srpt/ib_srpt.c
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@ -3204,7 +3204,6 @@ static int srpt_add_one(struct ib_device *device)
INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
srpt_event_handler);
ib_register_event_handler(&sdev->event_handler);
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i - 1];
@ -3227,6 +3226,7 @@ static int srpt_add_one(struct ib_device *device)
}
}
ib_register_event_handler(&sdev->event_handler);
spin_lock(&srpt_dev_lock);
list_add_tail(&sdev->list, &srpt_dev_list);
spin_unlock(&srpt_dev_lock);
@ -3237,7 +3237,6 @@ static int srpt_add_one(struct ib_device *device)
err_port:
srpt_unregister_mad_agent(sdev, i);
ib_unregister_event_handler(&sdev->event_handler);
err_cm:
if (sdev->cm_id)
ib_destroy_cm_id(sdev->cm_id);