archive mirror
 help / color / mirror / Atom feed
* [PATCH] clk: ti: composite: Prefer kcalloc over open coded arithmetic
@ 2021-09-04 13:17 Len Baker
  0 siblings, 0 replies; only message in thread
From: Len Baker @ 2021-09-04 13:17 UTC (permalink / raw)
  To: Tero Kristo, Michael Turquette, Stephen Boyd
  Cc: Len Baker, Kees Cook, linux-omap, linux-clk, linux-hardening,

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.


Signed-off-by: Len Baker <>
 drivers/clk/ti/composite.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/ti/composite.c b/drivers/clk/ti/composite.c
index eaa43575cfa5..eb5ce9735c7d 100644
--- a/drivers/clk/ti/composite.c
+++ b/drivers/clk/ti/composite.c
@@ -253,7 +253,7 @@ 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;


^ permalink raw reply	[flat|nested] only message in thread

only message in thread, other threads:[~2021-09-04 13:17 UTC | newest]

Thread overview: (only message) (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-09-04 13:17 [PATCH] clk: ti: composite: Prefer kcalloc over open coded arithmetic Len Baker

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).