archive mirror
 help / color / mirror / Atom feed
From: Len Baker <>
To: Tero Kristo <>,
	Michael Turquette <>,
	Stephen Boyd <>
Cc: Len Baker <>, Kees Cook <>,,,,
Subject: [PATCH] clk: ti: composite: Prefer kcalloc over open coded arithmetic
Date: Sat,  4 Sep 2021 15:17:14 +0200	[thread overview]
Message-ID: <> (raw)

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;


             reply	other threads:[~2021-09-04 13:17 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-04 13:17 Len Baker [this message]
2022-05-21  3:40 ` Stephen Boyd

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \
    --subject='Re: [PATCH] clk: ti: composite: Prefer kcalloc over open coded arithmetic' \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

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).