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Commit bf93585e authored by Jens Axboe's avatar Jens Axboe
Browse files

Merge branch 'nvme-4.19' of git://git.infradead.org/nvme into for-linus 

Pull single NVMe fix from Christoph.

* 'nvme-4.19' of git://git.infradead.org/nvme:
  nvmet-rdma: fix possible bogus dereference under heavy load
parents d5274b3c 8407879c

drivers/nvme/target/rdma.c

+25 −2
Original line number Diff line number Diff line
@@ -66,6 +66,7 @@ struct nvmet_rdma_rsp { 


	struct nvmet_req	req;



	bool			allocated;

	u8			n_rdma;

	u32			flags;

	u32			invalidate_rkey;
@@ -174,11 +175,19 @@ nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue) 
	unsigned long flags;



	spin_lock_irqsave(&queue->rsps_lock, flags);

	rsp = list_first_entry(&queue->free_rsps,

	rsp = list_first_entry_or_null(&queue->free_rsps,

				struct nvmet_rdma_rsp, free_list);

	if (likely(rsp))

		list_del(&rsp->free_list);

	spin_unlock_irqrestore(&queue->rsps_lock, flags);



	if (unlikely(!rsp)) {

		rsp = kmalloc(sizeof(*rsp), GFP_KERNEL);

		if (unlikely(!rsp))

			return NULL;

		rsp->allocated = true;

	}



	return rsp;

}
@@ -187,6 +196,11 @@ nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp) 
{

	unsigned long flags;



	if (rsp->allocated) {

		kfree(rsp);

		return;

	}



	spin_lock_irqsave(&rsp->queue->rsps_lock, flags);

	list_add_tail(&rsp->free_list, &rsp->queue->free_rsps);

	spin_unlock_irqrestore(&rsp->queue->rsps_lock, flags);
@@ -776,6 +790,15 @@ static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) 


	cmd->queue = queue;

	rsp = nvmet_rdma_get_rsp(queue);

	if (unlikely(!rsp)) {

		/*

		 * we get here only under memory pressure,

		 * silently drop and have the host retry

		 * as we can't even fail it.

		 */

		nvmet_rdma_post_recv(queue->dev, cmd);

		return;

	}

	rsp->queue = queue;

	rsp->cmd = cmd;

	rsp->flags = 0;