| Message ID | 20240624-usb_core_of_memleak-v1-1-af6821c1a584@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | usb: core: add missing of_node_put() in usb_of_has_devices_or_graph | expand |
Quoting Javier Carrasco (2024-06-24 14:10:06) > The for_each_child_of_node() macro requires an explicit call to > of_node_put() on early exits to decrement the child refcount and avoid a > memory leak. > The child node is not required outsie the loop, and the resource must be > released before the function returns. > > Add the missing of_node_put(). > > Cc: stable@vger.kernel.org > Fixes: 82e82130a78b ("usb: core: Set connect_type of ports based on DT node") > Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com> > --- Reviewed-by: Stephen Boyd <swboyd@chromium.org>
diff --git a/drivers/usb/core/of.c b/drivers/usb/core/of.c index f1a499ee482c..763e4122ed5b 100644 --- a/drivers/usb/core/of.c +++ b/drivers/usb/core/of.c @@ -84,9 +84,12 @@ static bool usb_of_has_devices_or_graph(const struct usb_device *hub) if (of_graph_is_present(np)) return true; - for_each_child_of_node(np, child) - if (of_property_present(child, "reg")) + for_each_child_of_node(np, child) { + if (of_property_present(child, "reg")) { + of_node_put(child); return true; + } + } return false; }
The for_each_child_of_node() macro requires an explicit call to of_node_put() on early exits to decrement the child refcount and avoid a memory leak. The child node is not required outsie the loop, and the resource must be released before the function returns. Add the missing of_node_put(). Cc: stable@vger.kernel.org Fixes: 82e82130a78b ("usb: core: Set connect_type of ports based on DT node") Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com> --- This bug was found while doing some code analysis, and I could not test it with real hardware. Although the issue and it solution are straightforward, any validation beyond compilation and static analysis is always welcome. --- drivers/usb/core/of.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- base-commit: 62c97045b8f720c2eac807a5f38e26c9ed512371 change-id: 20240624-usb_core_of_memleak-79161623b62e Best regards,