linux-kernel - [Linux-kernel-mentees] [PATCH] infiniband: Fix uninit-value in ucma

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Date:   Sat, 25 Jul 2020 15:48:39 -0400
From:   Peilin Ye <yepeilin.cs@...il.com>
To:     Doug Ledford <dledford@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>
Cc:     Peilin Ye <yepeilin.cs@...il.com>,
        Leon Romanovsky <leon@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        syzkaller-bugs@...glegroups.com,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [Linux-kernel-mentees] [PATCH] infiniband: Fix uninit-value in ucma_connect()

ucma_connect() is reading uninitialized memory when `in_len` is less than
`offsetof(struct rdma_ucm_connect, ece)`. Fix it.

Reported-and-tested-by: syzbot+7446526858b83c8828b2@...kaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?id=2c85ca2b1aedb22ed1029383751e36cee3f7d047
Signed-off-by: Peilin Ye <yepeilin.cs@...il.com>
---
 drivers/infiniband/core/ucma.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/core/ucma.c b/drivers/infiniband/core/ucma.c
index 5b87eee8ccc8..a591fdccdce0 100644
--- a/drivers/infiniband/core/ucma.c
+++ b/drivers/infiniband/core/ucma.c
@@ -1079,7 +1079,7 @@ static ssize_t ucma_connect(struct ucma_file *file, const char __user *inbuf,
 {
 	struct rdma_conn_param conn_param;
 	struct rdma_ucm_ece ece = {};
-	struct rdma_ucm_connect cmd;
+	struct rdma_ucm_connect cmd = {};
 	struct ucma_context *ctx;
 	size_t in_size;
 	int ret;
-- 
2.25.1