Possible crash at iscsit_handle_task_mgt_cmd() while handling task_reassign TMF (4.9 branch)

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All,

I'm not suggesting here a patch, but rather asking for your feedback

All the lines numbers are for *iscsi_target.c* (branch 4.9 at LXR)

0. In the case function == ISCSI_TM_FUNC_TASK_REASSIGN is handed over,
*core_tmr_alloc_req()* won't be called (due to the wrapping if
statement  at line 1975)
1. At line 2032. se_tmr local variable holds now a garbage
2. se_tmr->reference at line 2070 will lead to a crash

TIA,
-Moshe
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