linux-kernel - [PATCH 5.15 006/110] ASoC: hdmi-codec: Fix OOB memory accesses

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Date:   Mon,  7 Feb 2022 12:05:39 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Osipenko <digetx@...il.com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.15 006/110] ASoC: hdmi-codec: Fix OOB memory accesses

From: Dmitry Osipenko <digetx@...il.com>

commit 06feec6005c9d9500cd286ec440aabf8b2ddd94d upstream.

Correct size of iec_status array by changing it to the size of status
array of the struct snd_aes_iec958. This fixes out-of-bounds slab
read accesses made by memcpy() of the hdmi-codec driver. This problem
is reported by KASAN.

Cc: stable@...r.kernel.org
Signed-off-by: Dmitry Osipenko <digetx@...il.com>
Link: https://lore.kernel.org/r/20220112195039.1329-1-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 include/uapi/sound/asound.h   |    4 +++-
 sound/soc/codecs/hdmi-codec.c |    2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

--- a/include/uapi/sound/asound.h
+++ b/include/uapi/sound/asound.h
@@ -56,8 +56,10 @@
  *                                                                          *
  ****************************************************************************/
 
+#define AES_IEC958_STATUS_SIZE		24
+
 struct snd_aes_iec958 {
-	unsigned char status[24];	/* AES/IEC958 channel status bits */
+	unsigned char status[AES_IEC958_STATUS_SIZE]; /* AES/IEC958 channel status bits */
 	unsigned char subcode[147];	/* AES/IEC958 subcode bits */
 	unsigned char pad;		/* nothing */
 	unsigned char dig_subframe[4];	/* AES/IEC958 subframe bits */
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -277,7 +277,7 @@ struct hdmi_codec_priv {
 	bool busy;
 	struct snd_soc_jack *jack;
 	unsigned int jack_status;
-	u8 iec_status[5];
+	u8 iec_status[AES_IEC958_STATUS_SIZE];
 };
 
 static const struct snd_soc_dapm_widget hdmi_widgets[] = {