linux-kernel - [PATCH AUTOSEL 6.1 14/33] ASoC: lpass: Fix for KASAN use_after

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Date:   Wed, 31 May 2023 09:41:40 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ravulapati Vishnu Vardhan Rao <quic_visr@...cinc.com>,
        Sasha Levin <sashal@...nel.org>,
        srinivas.kandagatla@...aro.org, bgoswami@...cinc.com,
        lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org
Subject: [PATCH AUTOSEL 6.1 14/33] ASoC: lpass: Fix for KASAN use_after_free out of bounds

From: Ravulapati Vishnu Vardhan Rao <quic_visr@...cinc.com>

[ Upstream commit 75e5fab7db0cecb6e16b22c34608f0b40a4c7cd1 ]

When we run syzkaller we get below Out of Bounds error.

"KASAN: slab-out-of-bounds Read in regcache_flat_read"

Below is the backtrace of the issue:

BUG: KASAN: slab-out-of-bounds in regcache_flat_read+0x10c/0x110
Read of size 4 at addr ffffff8088fbf714 by task syz-executor.4/14144
CPU: 6 PID: 14144 Comm: syz-executor.4 Tainted: G        W
Hardware name: Qualcomm Technologies, Inc. sc7280 CRD platform (rev5+) (DT)
Call trace:
dump_backtrace+0x0/0x4ec
show_stack+0x34/0x50
dump_stack_lvl+0xdc/0x11c
print_address_description+0x30/0x2d8
kasan_report+0x178/0x1e4
__asan_report_load4_noabort+0x44/0x50
regcache_flat_read+0x10c/0x110
regcache_read+0xf8/0x5a0
_regmap_read+0x45c/0x86c
_regmap_update_bits+0x128/0x290
regmap_update_bits_base+0xc0/0x15c
snd_soc_component_update_bits+0xa8/0x22c
snd_soc_component_write_field+0x68/0xd4
tx_macro_put_dec_enum+0x1d0/0x268
snd_ctl_elem_write+0x288/0x474

By Error checking and checking valid values issue gets rectifies.

Signed-off-by: Ravulapati Vishnu Vardhan Rao <quic_visr@...cinc.com
Link: https://lore.kernel.org/r/20230511112532.16106-1-quic_visr@quicinc.com
Signed-off-by: Mark Brown <broonie@...nel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/lpass-tx-macro.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
index d1d9d8d2df2d2..9f59518005a5f 100644
--- a/sound/soc/codecs/lpass-tx-macro.c
+++ b/sound/soc/codecs/lpass-tx-macro.c
@@ -745,6 +745,8 @@ static int tx_macro_put_dec_enum(struct snd_kcontrol *kcontrol,
 	struct tx_macro *tx = snd_soc_component_get_drvdata(component);

 	val = ucontrol->value.enumerated.item[0];
+	if (val >= e->items)
+		return -EINVAL;

 	switch (e->reg) {
 	case CDC_TX_INP_MUX_ADC_MUX0_CFG0:
@@ -771,6 +773,9 @@ static int tx_macro_put_dec_enum(struct snd_kcontrol *kcontrol,
 	case CDC_TX_INP_MUX_ADC_MUX7_CFG0:
 		mic_sel_reg = CDC_TX7_TX_PATH_CFG0;
 		break;
+	default:
+		dev_err(component->dev, "Error in configuration!!\n");
+		return -EINVAL;
 	}

 	if (val != 0) {
-- 
2.39.2