[PATCH] ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]

[PATCH] ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]

[gerben]

From: Denis Rastyogin <gerben@altlinux.org>

component_dais[RSND_MAX_COMPONENT] is initially zero-initialized
and later populated in rsnd_dai_of_node(). However, the existing boundary check:
  if (i >= RSND_MAX_COMPONENT)

does not guarantee that the last valid element remains zero. As a result,
the loop can rely on component_dais[RSND_MAX_COMPONENT] being zero,
which may lead to an out-of-bounds access.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 547b02f74e4a ("ASoC: rsnd: enable multi Component support for Audio Graph Card/Card2")
Signed-off-by: Denis Rastyogin <gerben@altlinux.org>
---
 sound/soc/renesas/rcar/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/renesas/rcar/core.c b/sound/soc/renesas/rcar/core.c
index 69fb19964a71..2dc078358612 100644
--- a/sound/soc/renesas/rcar/core.c
+++ b/sound/soc/renesas/rcar/core.c
@@ -1974,7 +1974,7 @@ static int rsnd_probe(struct platform_device *pdev)
 	 *	asoc register
 	 */
 	ci = 0;
-	for (i = 0; priv->component_dais[i] > 0; i++) {
+	for (i = 0; i < RSND_MAX_COMPONENT && priv->component_dais[i] > 0; i++) {
 		int nr = priv->component_dais[i];
 
 		ret = devm_snd_soc_register_component(dev, &rsnd_soc_component,
-- 
2.42.2

Re: [PATCH] ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]

[Kuninori Morimoto]

Hi

> From: Denis Rastyogin <gerben@altlinux.org>
> 
> component_dais[RSND_MAX_COMPONENT] is initially zero-initialized
> and later populated in rsnd_dai_of_node(). However, the existing boundary check:
>   if (i >= RSND_MAX_COMPONENT)
> 
> does not guarantee that the last valid element remains zero. As a result,
> the loop can rely on component_dais[RSND_MAX_COMPONENT] being zero,
> which may lead to an out-of-bounds access.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 547b02f74e4a ("ASoC: rsnd: enable multi Component support for Audio Graph Card/Card2")
> Signed-off-by: Denis Rastyogin <gerben@altlinux.org>
> ---

Acked-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>

# I'm not sure why, but sometimes the mail is not comming to my mailbox
# even though it has To/Cc to me.
# I couldn't find it on spam folder either...
# I have noticed this patch via lore.kernel.org

Thank you for your help !!

Best regards
---
Kuninori Morimoto

Re: [PATCH] ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]

[Mark Brown]

On Fri, 27 Mar 2026 13:33:11 +0300, gerben@altlinux.org wrote:
> ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-7.1

Thanks!

[1/1] ASoC: rsnd: Fix potential out-of-bounds access of component_dais[]
      https://git.kernel.org/broonie/sound/c/f9e437cddf6c

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark