linux-kernel - [PATCH 4.9 29/87] libertas: fix improper return value

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Date:   Mon, 13 Nov 2017 13:55:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pan Bian <bianpan2016@....com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.9 29/87] libertas: fix improper return value

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pan Bian <bianpan2016@....com>

[ Upstream commit 259010c509b6f28b3b851ae45238cf526f52e185 ]

Function lbs_cmd_802_11_sleep_params() always return 0, even if the call
to lbs_cmd_with_response() fails. In this case, the parameter @sp will
keep uninitialized. Because the return value is 0, its caller (say
lbs_sleepparams_read()) will not detect the error, and will copy the
uninitialized stack memory to user sapce, resulting in stack information
leak. To avoid the bug, this patch returns variable ret (which takes
the return value of lbs_cmd_with_response()) instead of 0.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=188451

Signed-off-by: Pan Bian <bianpan2016@....com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/marvell/libertas/cmd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/net/wireless/marvell/libertas/cmd.c
+++ b/drivers/net/wireless/marvell/libertas/cmd.c
@@ -305,7 +305,7 @@ int lbs_cmd_802_11_sleep_params(struct l
 	}

 	lbs_deb_leave_args(LBS_DEB_CMD, "ret %d", ret);
-	return 0;
+	return ret;
 }

 static int lbs_wait_for_ds_awake(struct lbs_private *priv)