linux-kernel - [PATCH v2] bus: imx-weim: fix branch condition evaluates to a garbage value

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Message-Id: <20230306132526.8763-1-i.bornyakov@metrotek.ru>
Date:   Mon,  6 Mar 2023 16:25:26 +0300
From:   Ivan Bornyakov <i.bornyakov@...rotek.ru>
To:     linux-imx@....com
Cc:     Ivan Bornyakov <i.bornyakov@...rotek.ru>, shawnguo@...nel.org,
        s.hauer@...gutronix.de, kernel@...gutronix.de, festevam@...il.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: [PATCH v2] bus: imx-weim: fix branch condition evaluates to a garbage value

If bus type is other than imx50_weim_devtype and have no child devices,
variable 'ret' in function weim_parse_dt() will not be initialized, but
will be used as branch condition and return value. Fix this by
initializing 'ret' with 0.

This was discovered with help of clang-analyzer, but the situation is
quite possible in real life.

Fixes: 52c47b63412b ("bus: imx-weim: improve error handling upon child probe-failure")
Signed-off-by: Ivan Bornyakov <i.bornyakov@...rotek.ru>
Cc: stable@...r.kernel.org
Reviewed-by: Fabio Estevam <festevam@...il.com>
---
 drivers/bus/imx-weim.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

ChangeLog:
  v1:
[https://lore.kernel.org/all/20230306060505.11657-1-i.bornyakov@metrotek.ru/]
  v2:
    * add "Fixes" tag
    * add Fabio's "Reviewed-by" tag

diff --git a/drivers/bus/imx-weim.c b/drivers/bus/imx-weim.c
index 828c66bbaa67..55d917bd1f3f 100644
--- a/drivers/bus/imx-weim.c
+++ b/drivers/bus/imx-weim.c
@@ -204,8 +204,8 @@ static int weim_parse_dt(struct platform_device *pdev)
 	const struct of_device_id *of_id = of_match_device(weim_id_table,
 							   &pdev->dev);
 	const struct imx_weim_devtype *devtype = of_id->data;
+	int ret = 0, have_child = 0;
 	struct device_node *child;
-	int ret, have_child = 0;
 	struct weim_priv *priv;
 	void __iomem *base;
 	u32 reg;
-- 
2.39.2