nvmet-rdma: fix null dereference under heavy load

Under heavy load if we don't have any pre-allocated rsps left, we
dynamically allocate a rsp, but we are not actually allocating memory
for nvme_completion (rsp->req.rsp). In such a case, accessing pointer
fields (req->rsp->status) in nvmet_req_init() will result in crash.

To fix this, allocate the memory for nvme_completion by calling
nvmet_rdma_alloc_rsp()

Fixes: 8407879c("nvmet-rdma:fix possible bogus dereference under heavy load")
Cc: <stable@vger.kernel.org>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index a8d23eb80192024e2fe101f91fa58d222a17b698..a884e3a0e8afee4cf0d6bf3b8a8848d1f659c7c0 100644 (file)
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -139,6 +139,10 @@ static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc);
 static void nvmet_rdma_read_data_done(struct ib_cq *cq, struct ib_wc *wc);
 static void nvmet_rdma_qp_event(struct ib_event *event, void *priv);
 static void nvmet_rdma_queue_disconnect(struct nvmet_rdma_queue *queue);
+static void nvmet_rdma_free_rsp(struct nvmet_rdma_device *ndev,
+                               struct nvmet_rdma_rsp *r);
+static int nvmet_rdma_alloc_rsp(struct nvmet_rdma_device *ndev,
+                               struct nvmet_rdma_rsp *r);
 
 static const struct nvmet_fabrics_ops nvmet_rdma_ops;
 
@@ -182,9 +186,17 @@ nvmet_rdma_get_rsp(struct nvmet_rdma_queue *queue)
        spin_unlock_irqrestore(&queue->rsps_lock, flags);
 
        if (unlikely(!rsp)) {
-               rsp = kmalloc(sizeof(*rsp), GFP_KERNEL);
+               int ret;
+
+               rsp = kzalloc(sizeof(*rsp), GFP_KERNEL);
                if (unlikely(!rsp))
                        return NULL;
+               ret = nvmet_rdma_alloc_rsp(queue->dev, rsp);
+               if (unlikely(ret)) {
+                       kfree(rsp);
+                       return NULL;
+               }
+
                rsp->allocated = true;
        }
 
@@ -197,6 +209,7 @@ nvmet_rdma_put_rsp(struct nvmet_rdma_rsp *rsp)
        unsigned long flags;
 
        if (unlikely(rsp->allocated)) {
+               nvmet_rdma_free_rsp(rsp->queue->dev, rsp);
                kfree(rsp);
                return;
        }