nvme-rdma: Fix a use after free in nvmet_rdma_write_data_done

In nvmet_rdma_write_data_done, rsp is recoverd by wc->wr_cqe and freed by
nvmet_rdma_release_rsp(). But after that, pr_info() used the freed
chunk's member object and could leak the freed chunk address with
wc->wr_cqe by computing the offset.

Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 06b6b742bb213e3ba924ef113d81e4081379b2be..6c1f3ab7649c78b3e6aa9cd8b266e29bcbeba3ad 100644 (file)
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -802,9 +802,8 @@ static void nvmet_rdma_write_data_done(struct ib_cq *cq, struct ib_wc *wc)
                nvmet_req_uninit(&rsp->req);
                nvmet_rdma_release_rsp(rsp);
                if (wc->status != IB_WC_WR_FLUSH_ERR) {
-                       pr_info("RDMA WRITE for CQE 0x%p failed with status %s (%d).\n",
-                               wc->wr_cqe, ib_wc_status_msg(wc->status),
-                               wc->status);
+                       pr_info("RDMA WRITE for CQE failed with status %s (%d).\n",
+                               ib_wc_status_msg(wc->status), wc->status);
                        nvmet_rdma_error_comp(queue);
                }
                return;