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Subject[PATCH 4.9 080/144] net: ethernet: ti: cpsw-phy-sel: check bus_find_device() ret value
Date
4.9-stable review patch.  If anyone has any objections, please let me know.

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

From: Grygorii Strashko <grygorii.strashko@ti.com>

[ Upstream commit c6213eb1aee308e67377fd1890d84f7284caf531 ]

This fixes klockworks warnings: Pointer 'dev' returned from call to
function 'bus_find_device' at line 179 may be NULL and will be dereferenced
at line 181.

cpsw-phy-sel.c:179: 'dev' is assigned the return value from function 'bus_find_device'.
bus.c:342: 'bus_find_device' explicitly returns a NULL value.
cpsw-phy-sel.c:181: 'dev' is dereferenced by passing argument 1 to function 'dev_get_drvdata'.
device.h:1024: 'dev' is passed to function 'dev_get_drvdata'.
device.h:1026: 'dev' is explicitly dereferenced.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
[nsekhar@ti.com: add an error message, fix return path]
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/ti/cpsw-phy-sel.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/ti/cpsw-phy-sel.c
+++ b/drivers/net/ethernet/ti/cpsw-phy-sel.c
@@ -177,12 +177,18 @@ void cpsw_phy_sel(struct device *dev, ph
}

dev = bus_find_device(&platform_bus_type, NULL, node, match);
- of_node_put(node);
+ if (!dev) {
+ dev_err(dev, "unable to find platform device for %pOF\n", node);
+ goto out;
+ }
+
priv = dev_get_drvdata(dev);

priv->cpsw_phy_sel(priv, phy_mode, slave);

put_device(dev);
+out:
+ of_node_put(node);
}
EXPORT_SYMBOL_GPL(cpsw_phy_sel);


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