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Subject[PATCH 4.14 044/138] nvme_fcloop: fix abort race condition
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: James Smart <jsmart2021@gmail.com>


[ Upstream commit 278e096063f1914fccfc77a617be9fc8dbb31b0e ]

A test case revealed a race condition of an i/o completing on a thread
parallel to the delete_association generating the aborts for the
outstanding ios on the controller. The i/o completion was freeing the
target fcloop context, thus the abort task referenced the just-freed
memory.

Correct by clearing the target/initiator cross pointers in the io
completion and abort tasks before calling the callbacks. On aborts
that detect already finished io's, ensure the complete context is
called.

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/nvme/target/fcloop.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)

--- a/drivers/nvme/target/fcloop.c
+++ b/drivers/nvme/target/fcloop.c
@@ -374,6 +374,7 @@ fcloop_tgt_fcprqst_done_work(struct work

spin_lock(&tfcp_req->reqlock);
fcpreq = tfcp_req->fcpreq;
+ tfcp_req->fcpreq = NULL;
spin_unlock(&tfcp_req->reqlock);

if (tport->remoteport && fcpreq) {
@@ -615,11 +616,7 @@ fcloop_fcp_abort(struct nvme_fc_local_po

if (!tfcp_req)
/* abort has already been called */
- return;
-
- if (rport->targetport)
- nvmet_fc_rcv_fcp_abort(rport->targetport,
- &tfcp_req->tgt_fcp_req);
+ goto finish;

/* break initiator/target relationship for io */
spin_lock(&tfcp_req->reqlock);
@@ -627,6 +624,11 @@ fcloop_fcp_abort(struct nvme_fc_local_po
tfcp_req->fcpreq = NULL;
spin_unlock(&tfcp_req->reqlock);

+ if (rport->targetport)
+ nvmet_fc_rcv_fcp_abort(rport->targetport,
+ &tfcp_req->tgt_fcp_req);
+
+finish:
/* post the aborted io completion */
fcpreq->status = -ECANCELED;
schedule_work(&inireq->iniwork);

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