RDMA/rtrs-clt: Reset cid to con_num - 1 to stay in bounds

[ Upstream commit 3e4289b29e216a55d08a89e126bc0b37cbad9f38 ]

In the function init_conns(), after the create_con() and create_cm() for
loop if something fails. In the cleanup for loop after the destroy tag, we
access out of bound memory because cid is set to clt_path->s.con_num.

This commits resets the cid to clt_path->s.con_num - 1, to stay in bounds
in the cleanup loop later.

Fixes: 6a98d71daea1 ("RDMA/rtrs: client: main functionality")
Signed-off-by: Md Haris Iqbal <haris.iqbal@ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Grzegorz Prajsner <grzegorz.prajsner@ionos.com>
Link: https://patch.msgid.link/20240821112217.41827-7-haris.iqbal@ionos.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
index 9936a3354b47879143d6efa2b4b8cba2998d189c..84d2dfcd20af6f53b6590c1f2bcb836344303213 100644 (file)
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -2347,6 +2347,12 @@ static int init_conns(struct rtrs_clt_path *clt_path)
                if (err)
                        goto destroy;
        }
+
+       /*
+        * Set the cid to con_num - 1, since if we fail later, we want to stay in bounds.
+        */
+       cid = clt_path->s.con_num - 1;
+
        err = alloc_path_reqs(clt_path);
        if (err)
                goto destroy;