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| author | Nishka Dasgupta <nishkadg.linux@gmail.com> | 2019-07-24 13:54:12 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-07 18:59:26 +0200 |
| commit | 503aae8dcc18da16db4e5560188ac2a6162800d0 (patch) | |
| tree | e4c26d5352ccfe9364ff6a532b0c64186dd4d705 | |
| parent | b0a68c63887547fd190faa87c2c398b362b304f7 (diff) | |
| download | linux-stable-503aae8dcc18da16db4e5560188ac2a6162800d0.tar.gz linux-stable-503aae8dcc18da16db4e5560188ac2a6162800d0.tar.bz2 linux-stable-503aae8dcc18da16db4e5560188ac2a6162800d0.zip | |
PCI: tegra: Fix OF node reference leak
[ Upstream commit 9e38e690ace3e7a22a81fc02652fc101efb340cf ]
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 <nishkadg.linux@gmail.com>
[lorenzo.pieralisi@arm.com: rewrote commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/pci/controller/pci-tegra.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c index 464ba2538d52..03c42e8684f6 100644 --- a/drivers/pci/controller/pci-tegra.c +++ b/drivers/pci/controller/pci-tegra.c @@ -1994,14 +1994,15 @@ 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--; @@ -2010,12 +2011,13 @@ 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); @@ -2029,13 +2031,15 @@ 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); @@ -2062,6 +2066,10 @@ static int tegra_pcie_parse_dt(struct tegra_pcie *pcie) return err; return 0; + +err_node_put: + of_node_put(port); + return err; } /* |