This is a note to let you know that I've just added the patch titled
ASoC: SOF: control: add size checks for ext_bytes control .put()
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
asoc-sof-control-add-size-checks-for-ext_bytes-contr.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 5d693d36e4ed4fdac349bc181e910acbc5033163
Author: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Date: Mon Sep 21 14:08:12 2020 +0300
ASoC: SOF: control: add size checks for ext_bytes control .put()
[ Upstream commit 2ca210112ad91880d2d5a3f85fecc838600afbce ]
Make sure the TLV header and size are consistent before copying from
userspace.
Fixes: c3078f5397046 ('ASoC: SOF: Add Sound Open Firmware KControl support')
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@xxxxxxxxxxxxxxx>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@xxxxxxxxxxxxxxx>
Signed-off-by: Kai Vehmanen <kai.vehmanen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20200921110814.2910477-4-kai.vehmanen@xxxxxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/sound/soc/sof/control.c b/sound/soc/sof/control.c
index 186eea105bb15..009938d45ddd9 100644
--- a/sound/soc/sof/control.c
+++ b/sound/soc/sof/control.c
@@ -298,6 +298,10 @@ int snd_sof_bytes_ext_put(struct snd_kcontrol *kcontrol,
const struct snd_ctl_tlv __user *tlvd =
(const struct snd_ctl_tlv __user *)binary_data;
+ /* make sure we have at least a header */
+ if (size < sizeof(struct snd_ctl_tlv))
+ return -EINVAL;
+
/*
* The beginning of bytes data contains a header from where
* the length (as bytes) is needed to know the correct copy
@@ -306,6 +310,13 @@ int snd_sof_bytes_ext_put(struct snd_kcontrol *kcontrol,
if (copy_from_user(&header, tlvd, sizeof(const struct snd_ctl_tlv)))
return -EFAULT;
+ /* make sure TLV info is consistent */
+ if (header.length + sizeof(struct snd_ctl_tlv) > size) {
+ dev_err_ratelimited(scomp->dev, "error: inconsistent TLV, data %d + header %zu > %d\n",
+ header.length, sizeof(struct snd_ctl_tlv), size);
+ return -EINVAL;
+ }
+
/* be->max is coming from topology */
if (header.length > be->max) {
dev_err_ratelimited(scomp->dev, "error: Bytes data size %d exceeds max %d.\n",
