linux-kernel - [PATCH] RDMA/nes: do not leak uninitialized resp.reserved to userspace

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Date:   Mon,  4 Sep 2017 12:23:16 +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] RDMA/nes: do not leak uninitialized resp.reserved to userspace

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
setting resp.reserved to zero.

Fixes: 3c2d774cad5b ("RDMA/nes: Add a driver for NetEffect RNICs")
Cc: <stable@...r.kernel.org> [2.6.24+]
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 drivers/infiniband/hw/nes/nes_verbs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/infiniband/hw/nes/nes_verbs.c b/drivers/infiniband/hw/nes/nes_verbs.c
index f0dc5f4aa177..052c3822dfed 100644
--- a/drivers/infiniband/hw/nes/nes_verbs.c
+++ b/drivers/infiniband/hw/nes/nes_verbs.c
@@ -1666,6 +1666,7 @@ static struct ib_cq *nes_create_cq(struct ib_device *ibdev,
 		resp.cq_id = nescq->hw_cq.cq_number;
 		resp.cq_size = nescq->hw_cq.cq_size;
 		resp.mmap_db_index = 0;
+		resp.reserved = 0;
 		if (ib_copy_to_udata(udata, &resp, sizeof resp - sizeof resp.reserved)) {
 			nes_free_resource(nesadapter, nesadapter->allocated_cqs, cq_num);
 			kfree(nescq);
-- 
2.14.1