Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 49/50] target: Drop incorrect ABORT_TASK put for completed commands | Date | Mon, 14 Mar 2016 10:51:07 -0700 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Bellinger <nab@linux-iscsi.org>
commit 7f54ab5ff52fb0b91569bc69c4a6bc5cac1b768d upstream.
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> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/target/target_core_tmr.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/target/target_core_tmr.c +++ b/drivers/target/target_core_tmr.c @@ -177,7 +177,6 @@ void core_tmr_abort_task( if (!__target_check_io_state(se_cmd, se_sess, 0)) { spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); - target_put_sess_cmd(se_cmd); goto out; } list_del_init(&se_cmd->se_cmd_list);
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