linux-kernel - [PATCH 4.14 026/146] wil6210: missing length check in wmi_set

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Message-Id: <20181204103727.910576369@linuxfoundation.org>
Date:   Tue,  4 Dec 2018 11:48:32 +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, Lior David <qca_liord@....qualcomm.com>,
        Maya Erez <qca_merez@....qualcomm.com>,
        Kalle Valo <kvalo@....qualcomm.com>,
        Ben Hutchings <ben.hutchings@...ethink.co.uk>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 026/146] wil6210: missing length check in wmi_set_ie

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

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

commit b5a8ffcae4103a9d823ea3aa3a761f65779fbe2a upstream.

Add a length check in wmi_set_ie to detect unsigned integer
overflow.

Signed-off-by: Lior David <qca_liord@....qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@....qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@....qualcomm.com>
Signed-off-by: Ben Hutchings <ben.hutchings@...ethink.co.uk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/ath/wil6210/wmi.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/ath/wil6210/wmi.c b/drivers/net/wireless/ath/wil6210/wmi.c
index ffdd2fa401b1..d63d7c326801 100644
--- a/drivers/net/wireless/ath/wil6210/wmi.c
+++ b/drivers/net/wireless/ath/wil6210/wmi.c
@@ -1380,8 +1380,14 @@ int wmi_set_ie(struct wil6210_priv *wil, u8 type, u16 ie_len, const void *ie)
 	};
 	int rc;
 	u16 len = sizeof(struct wmi_set_appie_cmd) + ie_len;
-	struct wmi_set_appie_cmd *cmd = kzalloc(len, GFP_KERNEL);
+	struct wmi_set_appie_cmd *cmd;
 
+	if (len < ie_len) {
+		rc = -EINVAL;
+		goto out;
+	}
+
+	cmd = kzalloc(len, GFP_KERNEL);
 	if (!cmd) {
 		rc = -ENOMEM;
 		goto out;
-- 
2.17.1