linux-kernel - [PATCH 5.14 339/849] drm/bridge: it66121: Initialize {device,vendor}

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Message-Id: <20211115165431.705129721@linuxfoundation.org>
Date:   Mon, 15 Nov 2021 17:57:02 +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, Paul Cercueil <paul@...pouillou.net>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 339/849] drm/bridge: it66121: Initialize {device,vendor}_ids

From: Paul Cercueil <paul@...pouillou.net>

[ Upstream commit 3a5f3d61de657bc1c2b53b77d065c5526f982e10 ]

These two arrays are populated with data read from the I2C device
through regmap_read(), and the data is then compared with hardcoded
vendor/product ID values of supported chips.

However, the return value of regmap_read() was never checked. This is
fine, as long as the two arrays are zero-initialized, so that we don't
compare the vendor/product IDs against whatever garbage is left on the
stack.

Address this issue by zero-initializing these two arrays.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
Fixes: 988156dc2fc9 ("drm: bridge: add it66121 driver")
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
Signed-off-by: Robert Foss <robert.foss@...aro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210827163956.27517-1-paul@crapouillou.net
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bridge/ite-it66121.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/bridge/ite-it66121.c b/drivers/gpu/drm/bridge/ite-it66121.c
index 2f2a09adb4bc8..b130d01147c6c 100644
--- a/drivers/gpu/drm/bridge/ite-it66121.c
+++ b/drivers/gpu/drm/bridge/ite-it66121.c
@@ -889,7 +889,7 @@ unlock:
 static int it66121_probe(struct i2c_client *client,
 			 const struct i2c_device_id *id)
 {
-	u32 vendor_ids[2], device_ids[2], revision_id;
+	u32 revision_id, vendor_ids[2] = { 0 }, device_ids[2] = { 0 };
 	struct device_node *ep;
 	int ret;
 	struct it66121_ctx *ctx;
-- 
2.33.0