From 9e38e690ace3e7a22a81fc02652fc101efb340cf Mon Sep 17 00:00:00 2001 From: Nishka Dasgupta Date: Wed, 24 Jul 2019 13:54:12 +0530 Subject: [PATCH] PCI: tegra: Fix OF node reference leak Each iteration of for_each_child_of_node() executes of_node_put() on the previous node, but in some return paths in the middle of the loop of_node_put() is missing thus causing a reference leak. Hence stash these mid-loop return values in a variable 'err' and add a new label err_node_put which executes of_node_put() on the previous node and returns 'err' on failure. Change mid-loop return statements to point to jump to this label to fix the reference leak. Issue found with Coccinelle. Signed-off-by: Nishka Dasgupta [lorenzo.pieralisi@arm.com: rewrote commit log] Signed-off-by: Lorenzo Pieralisi --- drivers/pci/controller/pci-tegra.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c index 9a917b2..673a172 100644 --- a/drivers/pci/controller/pci-tegra.c +++ b/drivers/pci/controller/pci-tegra.c @@ -2237,14 +2237,15 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) err = of_pci_get_devfn(port); if (err < 0) { dev_err(dev, "failed to parse address: %d\n", err); - return err; + goto err_node_put; } index = PCI_SLOT(err); if (index < 1 || index > soc->num_ports) { dev_err(dev, "invalid port number: %d\n", index); - return -EINVAL; + err = -EINVAL; + goto err_node_put; } index--; @@ -2253,12 +2254,13 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) if (err < 0) { dev_err(dev, "failed to parse # of lanes: %d\n", err); - return err; + goto err_node_put; } if (value > 16) { dev_err(dev, "invalid # of lanes: %u\n", value); - return -EINVAL; + err = -EINVAL; + goto err_node_put; } lanes |= value << (index << 3); @@ -2272,13 +2274,15 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) lane += value; rp = devm_kzalloc(dev, sizeof(*rp), GFP_KERNEL); - if (!rp) - return -ENOMEM; + if (!rp) { + err = -ENOMEM; + goto err_node_put; + } err = of_address_to_resource(port, 0, &rp->regs); if (err < 0) { dev_err(dev, "failed to parse address: %d\n", err); - return err; + goto err_node_put; } INIT_LIST_HEAD(&rp->list); @@ -2330,6 +2334,10 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) return err; return 0; + +err_node_put: + of_node_put(port); + return err; } /* -- 2.7.4