[PATCH openEuler-22.03-LTS-SP1] clk: mediatek: clk-mt6779: Add check for mtk_alloc_clk_data

From: Jiasheng Jiang jiasheng@iscas.ac.cn

stable inclusion from stable-v5.10.201 commit 3994387ba3564976731179c4d4a6d7850ddda71a category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9RFZV CVE: CVE-2023-52873

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 1f57f78fbacf630430bf954e5a84caafdfea30c0 ]

Add the check for the return value of mtk_alloc_clk_data() in order to avoid NULL pointer dereference.

Fixes: 710774e04861 ("clk: mediatek: Add MT6779 clock support") Signed-off-by: Jiasheng Jiang jiasheng@iscas.ac.cn Link: https://lore.kernel.org/r/20230912093407.21505-2-jiasheng@iscas.ac.cn Reviewed-by: AngeloGioacchino Del Regno angelogioacchino.delregno@collabora.com Signed-off-by: Stephen Boyd sboyd@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Wang Hai wanghai38@huawei.com --- drivers/clk/mediatek/clk-mt6779.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/clk/mediatek/clk-mt6779.c b/drivers/clk/mediatek/clk-mt6779.c index 6e0d3a166729..cf720651fc53 100644 --- a/drivers/clk/mediatek/clk-mt6779.c +++ b/drivers/clk/mediatek/clk-mt6779.c @@ -1216,6 +1216,8 @@ static int clk_mt6779_apmixed_probe(struct platform_device *pdev) struct device_node *node = pdev->dev.of_node;

clk_data = mtk_alloc_clk_data(CLK_APMIXED_NR_CLK); + if (!clk_data) + return -ENOMEM;

mtk_clk_register_plls(node, plls, ARRAY_SIZE(plls), clk_data);

@@ -1236,6 +1238,8 @@ static int clk_mt6779_top_probe(struct platform_device *pdev) return PTR_ERR(base);

clk_data = mtk_alloc_clk_data(CLK_TOP_NR_CLK); + if (!clk_data) + return -ENOMEM;

mtk_clk_register_fixed_clks(top_fixed_clks, ARRAY_SIZE(top_fixed_clks), clk_data);