iscsi-target: Fix panic when adding second TCP connection to iSCSI session
commit 8abc718d upstream. In MC/S scenario, the conn->sess has been set NULL in iscsi_login_non_zero_tsih_s1 when the second connection comes here, then kernel panic. The conn->sess will be assigned in iscsi_login_non_zero_tsih_s2. So we should check whether it's NULL before calling. Signed-off-by: Feng Li <lifeng1519@gmail.com> Tested-by: Sumit Rai <sumit.rai@calsoftinc.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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