From f14b85d5a6a4afff9d78913af5535775712de17b Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Mon, 27 Aug 2018 10:21:53 +0200 Subject: [PATCH] power: supply: twl4030-charger: fix OF sibling-node lookup BugLink: https://bugs.launchpad.net/bugs/1836802 commit 9844fb2e351311210e6660a9a1c62d17424a6145 upstream. Use the new of_get_compatible_child() helper to lookup the usb sibling node instead of using of_find_compatible_node(), which searches the entire tree from a given start node and thus can return an unrelated (non-sibling) node. This also addresses a potential use-after-free (e.g. after probe deferral) as the tree-wide helper drops a reference to its first argument (i.e. the parent device node). While at it, also fix the related phy-node reference leak. Fixes: f5e4edb8c888 ("power: twl4030_charger: find associated phy by more reliable means.") Cc: stable # 4.2 Cc: NeilBrown Cc: Felipe Balbi Cc: Sebastian Reichel Reviewed-by: Sebastian Reichel Signed-off-by: Johan Hovold Signed-off-by: Rob Herring Signed-off-by: Greg Kroah-Hartman Signed-off-by: Andrea Righi Signed-off-by: Khalid Elmously --- drivers/power/supply/twl4030_charger.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c index bbcaee56db9d..b6a7d9f74cf3 100644 --- a/drivers/power/supply/twl4030_charger.c +++ b/drivers/power/supply/twl4030_charger.c @@ -996,12 +996,13 @@ static int twl4030_bci_probe(struct platform_device *pdev) if (bci->dev->of_node) { struct device_node *phynode; - phynode = of_find_compatible_node(bci->dev->of_node->parent, - NULL, "ti,twl4030-usb"); + phynode = of_get_compatible_child(bci->dev->of_node->parent, + "ti,twl4030-usb"); if (phynode) { bci->usb_nb.notifier_call = twl4030_bci_usb_ncb; bci->transceiver = devm_usb_get_phy_by_node( bci->dev, phynode, &bci->usb_nb); + of_node_put(phynode); if (IS_ERR(bci->transceiver)) { ret = PTR_ERR(bci->transceiver); if (ret == -EPROBE_DEFER) -- 2.39.2