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nvme-fc: rework the request initialization code

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Instead of setting and then clearing the first_sgl pointer for AEN requests,
leave that pointer zero. This patch does not change how requests are
initialized but avoids that Coverity reports the following complaint for
nvme_fc_init_aen_ops():

CID 1418400 (#1 of 1): Out-of-bounds access (OVERRUN)
4. overrun-buffer-val: Overrunning buffer pointed to by aen_op of 312 bytes by passing it to a function which accesses it at byte offset 312.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Bart Van Assche 2018-10-08 14:28:46 -07:00 committed by Christoph Hellwig
parent d3d0bc78be
commit 0d2bdf9f41
1 changed files with 6 additions and 3 deletions
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9
drivers/nvme/host/fc.c
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@ -1704,7 +1704,6 @@ __nvme_fc_init_request(struct nvme_fc_ctrl *ctrl,
op->fcp_req.rspaddr = &op->rsp_iu;
op->fcp_req.rsplen = sizeof(op->rsp_iu);
op->fcp_req.done = nvme_fc_fcpio_done;
op->fcp_req.first_sgl = &op_w_sgl->sgl[0];
op->fcp_req.private = &op->fcp_req.first_sgl[SG_CHUNK_SIZE];
op->ctrl = ctrl;
op->queue = queue;
@ -1746,9 +1745,14 @@ nvme_fc_init_request(struct blk_mq_tag_set *set, struct request *rq,
struct nvme_fcp_op_w_sgl *op = blk_mq_rq_to_pdu(rq);
int queue_idx = (set == &ctrl->tag_set) ? hctx_idx + 1 : 0;
struct nvme_fc_queue *queue = &ctrl->queues[queue_idx];
int res;
nvme_req(rq)->ctrl = &ctrl->ctrl;
return __nvme_fc_init_request(ctrl, queue, &op->op, rq, queue->rqcnt++);
res = __nvme_fc_init_request(ctrl, queue, &op->op, rq, queue->rqcnt++);
if (res)
return res;
op->op.fcp_req.first_sgl = &op->sgl[0];
return res;
}
static int
@ -1778,7 +1782,6 @@ nvme_fc_init_aen_ops(struct nvme_fc_ctrl *ctrl)
}
aen_op->flags = FCOP_FLAGS_AEN;
aen_op->fcp_req.first_sgl = NULL; /* no sg list */
aen_op->fcp_req.private = private;
memset(sqe, 0, sizeof(*sqe));