[PATCH 5.10/5.15/6.1] clk: mediatek: Add memory allocation fail handling in clk_mt2712_top_init_early()

[Aleksandr Mishin]

No upstream commit exists for this commit.

The issue was introduced with commit e2f744a82d72 ("clk: mediatek:
Add MT2712 clock support")

In case of memory allocation fail in clk_mt2712_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.

Signed-off-by: Aleksandr Mishin <amishin@xxxxxxxxxx>
---
 drivers/clk/mediatek/clk-mt2712.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mt2712.c b/drivers/clk/mediatek/clk-mt2712.c
index a0f0c9ed48d1..1830bae661dc 100644
--- a/drivers/clk/mediatek/clk-mt2712.c
+++ b/drivers/clk/mediatek/clk-mt2712.c
@@ -1277,6 +1277,11 @@ static void clk_mt2712_top_init_early(struct device_node *node)
 
 	if (!top_clk_data) {
 		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