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ASoC: SOF: topology: Fix bytes control size checks 

When using the example SOF amp widget topology, KASAN dumps this
when the AMP bytes kcontrol gets loaded:

[ 9.579548] BUG: KASAN: slab-out-of-bounds in
sof_control_load+0x8cc/0xac0 [snd_sof]
[ 9.588194] Write of size 40 at addr ffff8882314559dc by task
systemd-udevd/2411

Fix that by rejecting the topology if the bytes data size > max_size

Fixes: 311ce4fe76 ("ASoC: SOF: Add support for loading topologies")
Reviewed-by: Jaska Uimonen <jaska.uimonen@intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Dragos Tarcatu <dragos_tarcatu@mentor.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191106145816.9367-1-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Dragos Tarcatu 2019-11-06 08:58:16 -06:00 committed by Mark Brown
parent e44f3d49f9
commit 9508ef5a98
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 7 additions and 6 deletions
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13
sound/soc/sof/topology.c
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@ -543,15 +543,16 @@ static int sof_control_load_bytes(struct snd_soc_component *scomp,
struct soc_bytes_ext *sbe = (struct soc_bytes_ext *)kc->private_value;
int max_size = sbe->max;
if (le32_to_cpu(control->priv.size) > max_size) {
dev_err(sdev->dev, "err: bytes data size %d exceeds max %d.\n",
control->priv.size, max_size);
return -EINVAL;
}
/* init the get/put bytes data */
scontrol->size = sizeof(struct sof_ipc_ctrl_data) +
le32_to_cpu(control->priv.size);
if (scontrol->size > max_size) {
dev_err(sdev->dev, "err: bytes data size %d exceeds max %d.\n",
scontrol->size, max_size);
return -EINVAL;
}
scontrol->control_data = kzalloc(max_size, GFP_KERNEL);
cdata = scontrol->control_data;
if (!scontrol->control_data)