target: Drop incorrect ABORT_TASK put for completed commands
authorNicholas Bellinger <nab@linux-iscsi.org>
Sun, 6 Mar 2016 04:00:12 +0000 (20:00 -0800)
committerNicholas Bellinger <nab@linux-iscsi.org>
Sun, 6 Mar 2016 04:24:47 +0000 (20:24 -0800)
commit7f54ab5ff52fb0b91569bc69c4a6bc5cac1b768d
tree6d6406de2bb6f3ab3cd67413e4e2329707f29099
parent81f70ba233d5f660e1ea5fe23260ee323af5d53a
target: Drop incorrect ABORT_TASK put for completed commands

This patch fixes a recent ABORT_TASK regression associated
with commit febe562c, where a left-over target_put_sess_cmd()
would still be called when __target_check_io_state() detected
a command has already been completed, and explicit ABORT must
be avoided.

Note commit febe562c dropped the local kref_get_unless_zero()
check in core_tmr_abort_task(), but did not drop this extra
corresponding target_put_sess_cmd() in the failure path.

So go ahead and drop this now bogus target_put_sess_cmd(),
and avoid this potential use-after-free.

Reported-by: Dan Lane <dracodan@gmail.com>
Cc: Quinn Tran <quinn.tran@qlogic.com>
Cc: Himanshu Madhani <himanshu.madhani@qlogic.com>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Andy Grover <agrover@redhat.com>
Cc: Mike Christie <mchristi@redhat.com>
Cc: stable@vger.kernel.org # 3.14+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
drivers/target/target_core_tmr.c