[PATCH 5.10/5.15/6.1 v2] clk: mediatek: mt8183: Add memory allocation fail handling in clk_mt8183_top_init_early()

[Aleksandr Mishin]

No upstream commit exists for this commit.

The issue was introduced with commit c93d059a8045 ("clk: mediatek: mt8183:
Register 13MHz clock earlier for clocksource")

In case of memory allocation fail in clk_mt8183_top_init_early()
'top_clk_data' will be set to NULL and later dereferenced without check.
Fix this bug by adding NULL-return check.

Upstream branch code has been significantly refactored and can't be
backported directly.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: c93d059a8045 ("clk: mediatek: mt8183: Register 13MHz clock earlier for clocksource")
Signed-off-by: Aleksandr Mishin <amishin at t-argos.ru>
---
v1->v2: Add "Fixes:" tag, fix subject misspell

 drivers/clk/mediatek/clk-mt8183.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mt8183.c b/drivers/clk/mediatek/clk-mt8183.c
index 78620244144e..8377a877d9e3 100644
--- a/drivers/clk/mediatek/clk-mt8183.c
+++ b/drivers/clk/mediatek/clk-mt8183.c
@@ -1185,6 +1185,11 @@ static void clk_mt8183_top_init_early(struct device_node *node)
 	int i;
 
 	top_clk_data = mtk_alloc_clk_data(CLK_TOP_NR_CLK);
+	if (!top_clk_data) {
+		pr_err("%s(): could not register clock provider: %d\n",
+			__func__, -ENOMEM);
+		return;
+	}
 
 	for (i = 0; i < CLK_TOP_NR_CLK; i++)
 		top_clk_data->hws[i] = ERR_PTR(-EPROBE_DEFER);
-- 
2.30.2