linux-kernel - [PATCH] nvme/rdma: Fix a use after free in nvmet_rdma_write_data

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Message-Id: <20210311054413.8731-1-lyl2019@mail.ustc.edu.cn>
Date:   Wed, 10 Mar 2021 21:44:13 -0800
From:   Lv Yunlong <lyl2019@...l.ustc.edu.cn>
To:     hch@....de, sagi@...mberg.me, chaitanya.kulkarni@....com
Cc:     linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Lv Yunlong <lyl2019@...l.ustc.edu.cn>
Subject: [PATCH] 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@...l.ustc.edu.cn>
---
 drivers/nvme/target/rdma.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 06b6b742bb21..6c1f3ab7649c 100644
--- 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;
-- 
2.25.1