[PATCH] ALSA: ctxfi: change dao_set_input functions from kzalloc to kcalloc

[PATCH] ALSA: ctxfi: change dao_set_input functions from kzalloc to kcalloc

[Ethan Carter Edwards]

We are trying to get rid of all multiplications from allocation
functions to prevent potential integer overflows. Here the
multiplication is probably safe, but using kcalloc() is more
appropriate and improves readability. This patch has no effect
on runtime behavior.

Link: https://github.com/KSPP/linux/issues/162 [1]
Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Ethan Carter Edwards <ethan@ethancedwards.com>
---
 sound/pci/ctxfi/ctdaio.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/pci/ctxfi/ctdaio.c b/sound/pci/ctxfi/ctdaio.c
index 9993b02d2968c6c6858475f7ab98d4e90e7ffe2a..806c4d7543877ed74f8ec2dd894cf6b76af6f314 100644
--- a/sound/pci/ctxfi/ctdaio.c
+++ b/sound/pci/ctxfi/ctdaio.c
@@ -159,7 +159,7 @@ static int dao_set_left_input(struct dao *dao, struct rsc *input)
 	struct daio *daio = &dao->daio;
 	int i;
 
-	entry = kzalloc((sizeof(*entry) * daio->rscl.msr), GFP_KERNEL);
+	entry = kcalloc(daio->rscl.msr, sizeof(*entry), GFP_KERNEL);
 	if (!entry)
 		return -ENOMEM;
 
@@ -188,7 +188,7 @@ static int dao_set_right_input(struct dao *dao, struct rsc *input)
 	struct daio *daio = &dao->daio;
 	int i;
 
-	entry = kzalloc((sizeof(*entry) * daio->rscr.msr), GFP_KERNEL);
+	entry = kcalloc(daio->rscr.msr, sizeof(*entry), GFP_KERNEL);
 	if (!entry)
 		return -ENOMEM;
 

---
base-commit: 0a2f889128969dab41861b6e40111aa03dc57014
change-id: 20250308-ctdaio-kzalloc-fcf47b8c4f74

Best regards,
-- 
Ethan Carter Edwards <ethan@ethancedwards.com>

Re: [PATCH] ALSA: ctxfi: change dao_set_input functions from kzalloc to kcalloc

[Markus Elfring]

> We are trying to get rid of all multiplications from allocation
…

Please improve such a change description another bit.

See also:
https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14-rc5#n94

Regards,
Markus

Re: [PATCH] ALSA: ctxfi: change dao_set_input functions from kzalloc to kcalloc

[Takashi Iwai]

On Sat, 08 Mar 2025 19:52:59 +0100,
Ethan Carter Edwards wrote:
> 
> We are trying to get rid of all multiplications from allocation
> functions to prevent potential integer overflows. Here the
> multiplication is probably safe, but using kcalloc() is more
> appropriate and improves readability. This patch has no effect
> on runtime behavior.
> 
> Link: https://github.com/KSPP/linux/issues/162 [1]
> Link: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments
> 
> Signed-off-by: Ethan Carter Edwards <ethan@ethancedwards.com>

Thanks, applied now.


Takashi