[PATCH] ASoC: hdac_hda: fix hda pcm buffer overflow issue
From: Junxiao Chang
Date: Wed Nov 09 2022 - 18:49:37 EST
When KASAN is enabled, below log might be dumped with Intel EHL hardware:
[ 48.583597] ==================================================================
[ 48.585921] BUG: KASAN: slab-out-of-bounds in hdac_hda_dai_hw_params+0x20a/0x22b [snd_soc_hdac_hda]
[ 48.587995] Write of size 4 at addr ffff888103489708 by task pulseaudio/759
[ 48.589237] CPU: 2 PID: 759 Comm: pulseaudio Tainted: G U E 5.15.71-intel-ese-standard-lts #9
[ 48.591272] Hardware name: Intel Corporation Elkhart Lake Embedded Platform/ElkhartLake LPDDR4x T3 CRB, BIOS EHLSFWI1.R00.4251.A01.2206130432 06/13/2022
[ 48.593010] Call Trace:
[ 48.593648] <TASK>
[ 48.593852] dump_stack_lvl+0x34/0x48
[ 48.594404] print_address_description.constprop.0+0x1f/0x140
[ 48.595174] ? hdac_hda_dai_hw_params+0x20a/0x22b [snd_soc_hdac_hda]
[ 48.595868] ? hdac_hda_dai_hw_params+0x20a/0x22b [snd_soc_hdac_hda]
[ 48.596519] kasan_report.cold+0x7f/0x11b
[ 48.597003] ? hdac_hda_dai_hw_params+0x20a/0x22b [snd_soc_hdac_hda]
[ 48.597885] hdac_hda_dai_hw_params+0x20a/0x22b [snd_soc_hdac_hda]
HDAC_LAST_DAI_ID is last index id, pcm buffer array size should
be +1 to avoid out of bound access.
Fixes: 608b8c36c371 ("ASoC: hdac_hda: add support for HDMI/DP as a HDA codec")
Reviewed-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Signed-off-by: Junxiao Chang <junxiao.chang@xxxxxxxxx>
Signed-off-by: Furong Zhou <furong.zhou@xxxxxxxxx>
---
sound/soc/codecs/hdac_hda.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sound/soc/codecs/hdac_hda.h b/sound/soc/codecs/hdac_hda.h
index fc19c34ca00e5..b65560981abb2 100644
--- a/sound/soc/codecs/hdac_hda.h
+++ b/sound/soc/codecs/hdac_hda.h
@@ -14,7 +14,7 @@ enum {
HDAC_HDMI_1_DAI_ID,
HDAC_HDMI_2_DAI_ID,
HDAC_HDMI_3_DAI_ID,
- HDAC_LAST_DAI_ID = HDAC_HDMI_3_DAI_ID,
+ HDAC_DAI_ID_NUM
};
struct hdac_hda_pcm {
@@ -24,7 +24,7 @@ struct hdac_hda_pcm {
struct hdac_hda_priv {
struct hda_codec *codec;
- struct hdac_hda_pcm pcm[HDAC_LAST_DAI_ID];
+ struct hdac_hda_pcm pcm[HDAC_DAI_ID_NUM];
bool need_display_power;
};
--
2.25.1