linux-kernel - [PATCH] ASoC: SOF: ensure all fields in header are zero'd before copying back to userspace

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Message-Id: <20200422112417.208843-1-colin.king@canonical.com>
Date:   Wed, 22 Apr 2020 12:24:17 +0100
From:   Colin King <colin.king@...onical.com>
To:     Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        sound-open-firmware@...a-project.org, alsa-devel@...a-project.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] ASoC: SOF: ensure all fields in header are zero'd before copying back to userspace

From: Colin Ian King <colin.king@...onical.com>

Field header.tlv is uninitialized and being copied back to userspace
and hence leaking data from the stack to userspace.  Fix this by
ensuring the header structure is zero'd.

Fixes: c3078f539704 ("ASoC: SOF: Add Sound Open Firmware KControl support")
Addresses-Coverity: ("Uninitialized scalar variable")
Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 sound/soc/sof/control.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index dfc412e2d956..97d5c1a4c1ff 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -362,7 +362,7 @@ int snd_sof_bytes_ext_get(struct snd_kcontrol *kcontrol,
 	struct snd_sof_control *scontrol = be->dobj.private;
 	struct snd_soc_component *scomp = scontrol->scomp;
 	struct sof_ipc_ctrl_data *cdata = scontrol->control_data;
-	struct snd_ctl_tlv header;
+	struct snd_ctl_tlv header = { };
 	struct snd_ctl_tlv __user *tlvd =
 		(struct snd_ctl_tlv __user *)binary_data;
 	int data_size;
-- 
2.25.1