From 278e096063f1914fccfc77a617be9fc8dbb31b0e Mon Sep 17 00:00:00 2001 From: James Smart Date: Wed, 29 Nov 2017 16:47:30 -0800 Subject: [PATCH] nvme_fcloop: fix abort race condition 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 Signed-off-by: Christoph Hellwig --- drivers/nvme/target/fcloop.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/nvme/target/fcloop.c b/drivers/nvme/target/fcloop.c index 7b75d9de55ab..3eb2a0733f46 100644 --- a/drivers/nvme/target/fcloop.c +++ b/drivers/nvme/target/fcloop.c @@ -370,6 +370,7 @@ fcloop_tgt_fcprqst_done_work(struct 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) { @@ -611,11 +612,7 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport, 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); @@ -623,6 +620,11 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport, 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); -- 2.30.2