linux-kernel - [PATCH][V2] RDMA/nes: do not leak uninitialized resp.reserved to userspace Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit

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Message-Id: <20170904133705.3980-1-colin.king@canonical.com>
Date:   Mon,  4 Sep 2017 14:37:05 +0100
From:   Colin King <colin.king@...onical.com>
To:     Faisal Latif <faisal.latif@...el.com>,
        Doug Ledford <dledford@...hat.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Hal Rosenstock <hal.rosenstock@...il.com>,
        linux-rdma@...r.kernel.org
Cc:     kernel-janitors@...r.kernel.org, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH][V2] RDMA/nes: do not leak uninitialized resp.reserved to userspace Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit

From: Colin Ian King <colin.king@...onical.com>

resp.reserved has not been initialized and so the copy_to_user (via
ib_copy_to_udata) is copying uninitialized data from the stack back
to user space which is a potential information leak. Fix this by
initializing all of resp to zero.

V2: Initialize all of the struct rather than just resp.reserved as
suggested by Leon Romanovsky.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/infiniband/hw/nes/nes_verbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c
index f0dc5f4aa177..8998d11449c0 100644
--- a/drivers/infiniband/hw/nes/nes_verbs.c
+++ b/drivers/infiniband/hw/nes/nes_verbs.c
@@ -1437,7 +1437,7 @@ static struct ib_cq *nes_create_cq(struct ib_device *ibdev,
 	struct nes_hw_cqp_wqe *cqp_wqe;
 	struct nes_pbl *nespbl = NULL;
 	struct nes_create_cq_req req;
-	struct nes_create_cq_resp resp;
+	struct nes_create_cq_resp resp = { 0 };
 	u32 cq_num = 0;
 	u32 opcode = 0;
 	u32 pbl_entries = 1;
-- 
2.14.1