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authorDragos Tarcatu <dragos_tarcatu@mentor.com>2019-11-06 08:58:16 -0600
committerMark Brown <broonie@kernel.org>2019-11-06 15:31:12 +0000
commit9508ef5a980f5d847cad9b932b6ada8f2a3466c1 (patch)
treec2c6e0ebd24d1fb6904217eced068176ba19019c /sound/soc
parente44f3d49f900c645af434a3a1dfdbfb79c4a7851 (diff)
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: 311ce4fe7637d ("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>
Diffstat (limited to 'sound/soc')
-rw-r--r--sound/soc/sof/topology.c11
1 files changed, 6 insertions, 5 deletions
diff --git a/sound/soc/sof/topology.c b/sound/soc/sof/topology.c
index 0aabb3190ddc..4452594c2e17 100644
--- a/sound/soc/sof/topology.c
+++ b/sound/soc/sof/topology.c
@@ -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) {
+ /* 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",
- control->priv.size, max_size);
+ scontrol->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);
scontrol->control_data = kzalloc(max_size, GFP_KERNEL);
cdata = scontrol->control_data;
if (!scontrol->control_data)