[PATCH V3] net: dsa: Add of_node_put() before break and return statements
From: Sumera Priyadarsini <hidden>
Date: 2020-08-23 19:31:08
Also in:
linux-mediatek, lkml, netdev
Subsystem:
mediatek switch driver, networking drivers, networking [dsa], the rest · Maintainers:
Chester A. Unal, Daniel Golle, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Vladimir Oltean, Linus Torvalds
Every iteration of for_each_child_of_node() decrements the reference count of the previous node, however when control is transferred from the middle of the loop, as in the case of a return or break or goto, there is no decrement thus ultimately resulting in a memory leak. Fix a potential memory leak in mt7530.c by inserting of_node_put() before the break and return statements. Issue found with Coccinelle. --- Changes in v2: Add another of_node_put() in for_each_child_of_node() as pointed out by Andrew. Changes in v3: - Correct syntax errors - Modify commit message --- Signed-off-by: Sumera Priyadarsini <redacted> Signed-off-by: Sumera Priyadarsini <redacted> --- drivers/net/dsa/mt7530.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
index 8dcb8a49ab67..4b4701c69fe1 100644
--- a/drivers/net/dsa/mt7530.c
+++ b/drivers/net/dsa/mt7530.c@@ -1326,14 +1326,17 @@ mt7530_setup(struct dsa_switch *ds) if (phy_node->parent == priv->dev->of_node->parent) { ret = of_get_phy_mode(mac_np, &interface); - if (ret && ret != -ENODEV) + if (ret && ret != -ENODEV) { + of_node_put(mac_np); return ret; + } id = of_mdio_parse_addr(ds->dev, phy_node); if (id == 0) priv->p5_intf_sel = P5_INTF_SEL_PHY_P0; if (id == 4) priv->p5_intf_sel = P5_INTF_SEL_PHY_P4; } + of_node_put(mac_np); of_node_put(phy_node); break; }
--
2.17.1
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