From: Geert Uytterhoeven geert+renesas@glider.be
[ Upstream commit b790c8ea5593d6dc3580adfad8e117eeb56af874 ]
Calling of_node_put() decreases the reference count of a device tree object, and may free some data.
However, the of_phandle_args structure embedding it is passed to reset_controller_dev.of_xlate() after that, so it may still be accessed.
Move the call to of_node_put() down to fix this.
Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be [p.zabel@pengutronix.de: moved of_node_put after mutex_unlock] Signed-off-by: Philipp Zabel p.zabel@pengutronix.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/reset/core.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-)
diff --git a/drivers/reset/core.c b/drivers/reset/core.c index 188205a552613..d0ebca301afc9 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -324,28 +324,29 @@ struct reset_control *__of_reset_control_get(struct device_node *node, break; } } - of_node_put(args.np);
if (!rcdev) { - mutex_unlock(&reset_list_mutex); - return ERR_PTR(-EPROBE_DEFER); + rstc = ERR_PTR(-EPROBE_DEFER); + goto out; }
if (WARN_ON(args.args_count != rcdev->of_reset_n_cells)) { - mutex_unlock(&reset_list_mutex); - return ERR_PTR(-EINVAL); + rstc = ERR_PTR(-EINVAL); + goto out; }
rstc_id = rcdev->of_xlate(rcdev, &args); if (rstc_id < 0) { - mutex_unlock(&reset_list_mutex); - return ERR_PTR(rstc_id); + rstc = ERR_PTR(rstc_id); + goto out; }
/* reset_list_mutex also protects the rcdev's reset_control list */ rstc = __reset_control_get_internal(rcdev, rstc_id, shared);
+out: mutex_unlock(&reset_list_mutex); + of_node_put(args.np);
return rstc; }