drm/sun4i: tcon top: Fix NULL/invalid pointer dereference in sun8i_tcon_top_un/bind

There are two problems here:

1. Not all clk_data->hws[] need to be initialized, depending on various
   configured quirks. This leads to NULL ptr deref in
   clk_hw_unregister_gate() in sun8i_tcon_top_unbind()
2. If there is error when registering the clk_data->hws[],
   err_unregister_gates error path will try to unregister
   IS_ERR()=true (invalid) pointer.

For problem (1) I have this stack trace:

Unable to handle kernel NULL pointer dereference at virtual
  address 0000000000000008
Call trace:
 clk_hw_unregister+0x8/0x18
 clk_hw_unregister_gate+0x14/0x28
 sun8i_tcon_top_unbind+0x2c/0x60
 component_unbind.isra.4+0x2c/0x50
 component_bind_all+0x1d4/0x230
 sun4i_drv_bind+0xc4/0x1a0
 try_to_bring_up_master+0x164/0x1c0
 __component_add+0xa0/0x168
 component_add+0x10/0x18
 sun8i_dw_hdmi_probe+0x18/0x20
 platform_drv_probe+0x3c/0x70
 really_probe+0xcc/0x278
 driver_probe_device+0x34/0xa8

Problem (2) was identified by head scratching.

Signed-off-by: Ondrej Jirman <megous@megous.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190405233048.3823-1-megous@megous.com

diff --git a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
index fc36e0c10a374a2a33a054a4102944dfb0b03009..b1e7c76e9c17269664fddd5ab5c90c3477b80a0c 100644 (file)
--- a/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
+++ b/drivers/gpu/drm/sun4i/sun8i_tcon_top.c
@@ -227,7 +227,7 @@ static int sun8i_tcon_top_bind(struct device *dev, struct device *master,
 
 err_unregister_gates:
        for (i = 0; i < CLK_NUM; i++)
-               if (clk_data->hws[i])
+               if (!IS_ERR_OR_NULL(clk_data->hws[i]))
                        clk_hw_unregister_gate(clk_data->hws[i]);
        clk_disable_unprepare(tcon_top->bus);
 err_assert_reset:
@@ -245,7 +245,8 @@ static void sun8i_tcon_top_unbind(struct device *dev, struct device *master,
 
        of_clk_del_provider(dev->of_node);
        for (i = 0; i < CLK_NUM; i++)
-               clk_hw_unregister_gate(clk_data->hws[i]);
+               if (clk_data->hws[i])
+                       clk_hw_unregister_gate(clk_data->hws[i]);
 
        clk_disable_unprepare(tcon_top->bus);
        reset_control_assert(tcon_top->rst);