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

[AngeloGioacchino Del Regno]

Il 06/06/24 13:09, Aleksandr Mishin ha scritto:
> 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.
> 

...the fixes tag is still missing.

Regards,
Angelo

> Signed-off-by: Aleksandr Mishin <amishin at t-argos.ru>
> ---
>   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);