scsi: libiscsi: Hold back_lock when calling iscsi_complete_task

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If there is an error queueing an iscsi command in iscsi_queuecommand(), for
example if the transport fails to take the command in
sessuin->tt->xmit_task(), then the error path can call
iscsi_complete_task() without first aquiring the back_lock as
required. This can lead to things like ITT pool can get corrupt, resulting
in duplicate ITTs being sent out.

The solution is to hold the back_lock around iscsi_complete_task() calls,
and to add a little commenting to help others understand when back_lock
must be held.

Signed-off-by: Lee Duncan <lduncan@suse.com>
Acked-by: Chris Leech <cleech@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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Lee Duncan 2019-02-25 09:41:30 -08:00 • committed by Martin K. Petersen

parent cf9efd5d92

commit a656183e6c

1 changed files with 20 additions and 2 deletions

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drivers/scsi/libiscsi.c

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