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

mainline inclusion
from mainline-v6.9-rc1
commit c21a8870c98611e8f892511825c9607f1e2cd456
category: bugfix
bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9HK8Y
CVE: CVE-2024-26872

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c21a8870c98611e8f892511825c9607f1e2cd456



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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: a42d985b ("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>

Conflicts:
	drivers/infiniband/ulp/srpt/ib_srpt.c

Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com>