diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-10-08 13:14:35 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-11-24 08:23:21 +0100 |
| commit | 784505c2378a1d96a4c97d2ec055ececfdcf4914 (patch) | |
| tree | ab1544c8aac9aba9b700b5f6fb2944a201c3f21c /drivers/reset | |
| parent | e5379b2bc7e11c157a4a1d9e7fb81f52b79c66b1 (diff) | |
reset: Fix potential use-after-free in __of_reset_control_get()
[ 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>
Diffstat (limited to 'drivers/reset')
| -rw-r--r-- | drivers/reset/core.c | 15 |
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/reset/core.c b/drivers/reset/core.c index da4292e9de97..72b96b5c75a8 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -466,28 +466,29 @@ 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; } |