clk: ti: composite: Prefer kcalloc over open coded arithmetic

As noted in the "Deprecated Interfaces, Language Features, Attributes,
and Conventions" documentation [1], size calculations (especially
multiplication) should not be performed in memory allocator (or similar)
function arguments due to the risk of them overflowing. This could lead
to values wrapping around and a smaller allocation being made than the
caller was expecting. Using those allocations could lead to linear
overflows of heap memory and other misbehaviors.

So, use the purpose specific kcalloc() function instead of the argument
size * count in the kzalloc() function.

[1] https://www.kernel.org/doc/html/v5.14/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Len Baker <len.baker@gmx.com>
Link: https://lore.kernel.org/r/20210904131714.2312-1-len.baker@gmx.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>

diff --git a/drivers/clk/ti/composite.c b/drivers/clk/ti/composite.c
index 8d60319be3683c8e9c86052d4590474eaa095c6c..779b9900f636d7c6daa9ddec4a0fc4453d6ae5b2 100644 (file)
--- a/drivers/clk/ti/composite.c
+++ b/drivers/clk/ti/composite.c
@@ -255,7 +255,7 @@ int __init ti_clk_add_component(struct device_node *node, struct clk_hw *hw,
                return -EINVAL;
        }
 
-       parent_names = kzalloc((sizeof(char *) * num_parents), GFP_KERNEL);
+       parent_names = kcalloc(num_parents, sizeof(char *), GFP_KERNEL);
        if (!parent_names)
                return -ENOMEM;