On 2/15/21 11:40 AM, Alexandru Ardelean wrote:
static ssize_t iio_show_scan_index(struct device *dev,
struct device_attribute *attr,
char *buf)
@@ -1451,11 +1465,13 @@ static void __iio_buffer_free_sysfs_and_mask(struct
iio_buffer *buffer)
iio_free_chan_devattr_list(&buffer->buffer_attr_list);
}
-int iio_buffer_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
+int iio_buffers_alloc_sysfs_and_mask(struct iio_dev *indio_dev)
{
[...]
+error_unwind_sysfs_and_mask:
+ for (; unwind_idx >= 0; unwind_idx--) {
+ buffer = iio_dev_opaque->attached_buffers[unwind_idx];
+ __iio_buffer_free_sysfs_and_mask(buffer);
+ }
+ kfree(iio_dev_opaque->attached_buffers);
+ return ret;
}
-void iio_buffer_free_sysfs_and_mask(struct iio_dev *indio_dev)
+void iio_buffers_free_sysfs_and_mask(struct iio_dev *indio_dev)
{
[...]
+ for (i = iio_dev_opaque->attached_buffers_cnt - 1; i >= 0; i--) {
+ buffer = iio_dev_opaque->attached_buffers[i];
+ __iio_buffer_free_sysfs_and_mask(buffer);
+ }
+
+ kfree(iio_dev_opaque->attached_buffers);
}
[...]
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 1d500ea246af..f7f785431106 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1583,7 +1583,7 @@ static void iio_dev_release(struct device *device)
iio_device_unregister_eventset(indio_dev);
iio_device_unregister_sysfs(indio_dev);
- iio_buffer_put(indio_dev->buffer);
+ iio_buffers_put(indio_dev);
We do call kfree(iio_dev_opaque->attached_buffers) before we get here. I
think we need to keep the array around, otherwise we end of up with a
use after free.
