diff options
| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-10-08 13:14:35 +0200 |
|---|---|---|
| committer | Philipp Zabel <p.zabel@pengutronix.de> | 2018-10-08 15:25:21 +0200 |
| commit | b790c8ea5593d6dc3580adfad8e117eeb56af874 (patch) | |
| tree | d2d2fe620766a8caf5d26cdc934ef5b0ef14a3aa /drivers/reset/core.c | |
| parent | eea2926b0a390969828e49ea96c45a2b1f007030 (diff) | |
reset: Fix potential use-after-free in __of_reset_control_get()
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>
Diffstat (limited to 'drivers/reset/core.c')
| -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 225e34c56b94..d1887c0ed5d3 100644 --- a/drivers/reset/core.c +++ b/drivers/reset/core.c @@ -496,28 +496,29 @@ 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; } |