linux-kernel - [PATCH AUTOSEL 5.10 04/12] ALSA: hda/ca0132: fixup buffer overrun at tuning_ctl

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Message-Id: <20230322200207.1997367-4-sashal@kernel.org>
Date:   Wed, 22 Mar 2023 16:01:58 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        Takashi Iwai <tiwai@...e.de>, Sasha Levin <sashal@...nel.org>,
        perex@...ex.cz, tiwai@...e.com, ye.xingchen@....com.cn,
        dev@...nwang.io, gremlin@...linux.org, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 5.10 04/12] ALSA: hda/ca0132: fixup buffer overrun at tuning_ctl_set()

From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

[ Upstream commit 98e5eb110095ec77cb6d775051d181edbf9cd3cf ]

tuning_ctl_set() might have buffer overrun at (X) if it didn't break
from loop by matching (A).

	static int tuning_ctl_set(...)
	{
		for (i = 0; i < TUNING_CTLS_COUNT; i++)
(A)			if (nid == ca0132_tuning_ctls[i].nid)
				break;

		snd_hda_power_up(...);
(X)		dspio_set_param(..., ca0132_tuning_ctls[i].mid, ...);
		snd_hda_power_down(...);                ^

		return 1;
	}

We will get below error by cppcheck

	sound/pci/hda/patch_ca0132.c:4229:2: note: After for loop, i has value 12
	 for (i = 0; i < TUNING_CTLS_COUNT; i++)
	 ^
	sound/pci/hda/patch_ca0132.c:4234:43: note: Array index out of bounds
	 dspio_set_param(codec, ca0132_tuning_ctls[i].mid, 0x20,
	                                           ^
This patch cares non match case.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Link: https://lore.kernel.org/r/87sfe9eap7.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/hda/patch_ca0132.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_ca0132.c b/sound/pci/hda/patch_ca0132.c
index 24c2638cde376..6057084da4cf8 100644
--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -4108,8 +4108,10 @@ static int tuning_ctl_set(struct hda_codec *codec, hda_nid_t nid,
 
 	for (i = 0; i < TUNING_CTLS_COUNT; i++)
 		if (nid == ca0132_tuning_ctls[i].nid)
-			break;
+			goto found;
 
+	return -EINVAL;
+found:
 	snd_hda_power_up(codec);
 	dspio_set_param(codec, ca0132_tuning_ctls[i].mid, 0x20,
 			ca0132_tuning_ctls[i].req,
-- 
2.39.2