[PATCH AUTOSEL 4.14 3/9] ALSA: hda/ca0132: fixup buffer overrun at tuning_ctl_set()

Sasha Levin
2023-03-22T20:13:31Z

From: Kuninori Morimoto <kuninori.morimoto.gx@renesas.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@renesas.com>
Link: https://lore.kernel.org/r/87sfe9eap7.wl-kuninori.morimoto.gx@renesas.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.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 280643f72c6e2..13c32f3414d2f 100644
--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -2943,8 +2943,10 @@ 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,
ca0132_tuning_ctls[i].req,
--
2.39.2