ASoC: hdmi-codec: Fix OOB memory accesses

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@vger.kernel.org
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Link: https://lore.kernel.org/r/20220112195039.1329-1-digetx@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/include/uapi/sound/asound.h b/include/uapi/sound/asound.h
index ff7e638..228279e 100644 (file)
--- 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 */

diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index b61f980..b07607a 100644 (file)
--- 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[] = {