From: William Kucharski william.kucharski@oracle.com
[ Upstream commit c21a8870c98611e8f892511825c9607f1e2cd456 ]
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: a42d985bd5b2 ("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.c... Reviewed-by: Bart Van Assche bvanassche@acm.org Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/infiniband/ulp/srpt/ib_srpt.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c index 41abf9cf11c67..960f870a952a5 100644 --- a/drivers/infiniband/ulp/srpt/ib_srpt.c +++ b/drivers/infiniband/ulp/srpt/ib_srpt.c @@ -3205,7 +3205,6 @@ 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]; @@ -3228,6 +3227,7 @@ 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); @@ -3238,7 +3238,6 @@ 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);