From adb76a520d068a54ee5ca82e756cf8e5a47363a4 Mon Sep 17 00:00:00 2001
From: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Date: Mon, 22 Mar 2021 09:13:25 -0700
Subject: [PATCH 1/1] IB/isert: Fix a use after free in isert_connect_request
Git-commit: adb76a520d068a54ee5ca82e756cf8e5a47363a4
Patch-mainline: v5.13
References: git-fixes
The device is got by isert_device_get() with refcount is 1, and is
assigned to isert_conn by
isert_conn->device = device.
When isert_create_qp() failed, device will be freed with
isert_device_put().
Later, the device is used in isert_free_login_buf(isert_conn) by the
isert_conn->device->ib_device statement.
Free the device in the correct order.
Fixes: ae9ea9ed38c9 ("iser-target: Split some logic in isert_connect_request to routines")
Link: https://lore.kernel.org/r/20210322161325.7491-1-lyl2019@mail.ustc.edu.cn
Signed-off-by: Lv Yunlong <lyl2019@mail.ustc.edu.cn>
Acked-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Acked-by: Nicolas Morey-Chaisemartin <nmoreychaisemartin@suse.com>
---
drivers/infiniband/ulp/isert/ib_isert.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
diff --git a/drivers/infiniband/ulp/isert/ib_isert.c b/drivers/infiniband/ulp/isert/ib_isert.c
index 7305ed8976c2..18266f07c58d 100644
--- a/drivers/infiniband/ulp/isert/ib_isert.c
+++ b/drivers/infiniband/ulp/isert/ib_isert.c
@@ -438,23 +438,23 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
isert_init_conn(isert_conn);
isert_conn->cm_id = cma_id;
- ret = isert_alloc_login_buf(isert_conn, cma_id->device);
- if (ret)
- goto out;
-
device = isert_device_get(cma_id);
if (IS_ERR(device)) {
ret = PTR_ERR(device);
- goto out_rsp_dma_map;
+ goto out;
}
isert_conn->device = device;
+ ret = isert_alloc_login_buf(isert_conn, cma_id->device);
+ if (ret)
+ goto out_conn_dev;
+
isert_set_nego_params(isert_conn, &event->param.conn);
isert_conn->qp = isert_create_qp(isert_conn, cma_id);
if (IS_ERR(isert_conn->qp)) {
ret = PTR_ERR(isert_conn->qp);
- goto out_conn_dev;
+ goto out_rsp_dma_map;
}
ret = isert_login_post_recv(isert_conn);
@@ -473,10 +473,10 @@ isert_connect_request(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
out_destroy_qp:
isert_destroy_qp(isert_conn);
-out_conn_dev:
- isert_device_put(device);
out_rsp_dma_map:
isert_free_login_buf(isert_conn);
+out_conn_dev:
+ isert_device_put(device);
out:
kfree(isert_conn);
rdma_reject(cma_id, NULL, 0, IB_CM_REJ_CONSUMER_DEFINED);
--
2.31.1.5.g533053588dc3