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video: fbdev: amba-clcd: Fix refcount leak bugs 

[ Upstream commit 26c2b7d9fa ]

In clcdfb_of_init_display(), we should call of_node_put() for the
references returned by of_graph_get_next_endpoint() and
of_graph_get_remote_port_parent() which have increased the refcount.

Besides, we should call of_node_put() both in fail path or when
the references are not used anymore.

Fixes: d10715be03 ("video: ARM CLCD: Add DT support")
Signed-off-by: Liang He <windhl@126.com>
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Liang He 2022-07-19 16:25:46 +08:00 committed by Greg Kroah-Hartman
parent db7bc17d33
commit 2688df86c0
1 changed files with 18 additions and 6 deletions
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24
drivers/video/fbdev/amba-clcd.c
View File

@ -772,8 +772,10 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
return -ENODEV;
panel = of_graph_get_remote_port_parent(endpoint);
if (!panel)
return -ENODEV;
if (!panel) {
err = -ENODEV;
goto out_endpoint_put;
}
if (fb->vendor->init_panel) {
err = fb->vendor->init_panel(fb, panel);
@ -783,11 +785,11 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
err = clcdfb_of_get_backlight(panel, fb->panel);
if (err)
return err;
goto out_panel_put;
err = clcdfb_of_get_mode(&fb->dev->dev, panel, fb->panel);
if (err)
return err;
goto out_panel_put;
err = of_property_read_u32(fb->dev->dev.of_node, "max-memory-bandwidth",
&max_bandwidth);
@ -816,11 +818,21 @@ static int clcdfb_of_init_display(struct clcd_fb *fb)
if (of_property_read_u32_array(endpoint,
"arm,pl11x,tft-r0g0b0-pads",
tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0)
return -ENOENT;
tft_r0b0g0, ARRAY_SIZE(tft_r0b0g0)) != 0) {
err = -ENOENT;
goto out_panel_put;
}
of_node_put(panel);
of_node_put(endpoint);
return clcdfb_of_init_tft_panel(fb, tft_r0b0g0[0],
tft_r0b0g0[1], tft_r0b0g0[2]);
out_panel_put:
of_node_put(panel);
out_endpoint_put:
of_node_put(endpoint);
return err;
}
static int clcdfb_of_vram_setup(struct clcd_fb *fb)