[PATCH] iio: buffer: hw-consumer: free scan_mask on buffer release

Felix Gu
2026-04-27T11:11:44Z

The scan_mask lifetime changed in commit 9a2e1233d38c ("iio: buffer:
hw-consumer: remove redundant scan_mask flexible array").

Before that change, the scan mask storage was embedded in struct
hw_consumer_buffer, so iio_hw_buf_release() could free the whole
allocation with a single kfree(hw_buf).

That commit moved the scan mask to a separate bitmap_zalloc() allocation
stored in buffer.scan_mask, but left iio_hw_buf_release() unchanged.

Free the scan mask in iio_hw_buf_release() before freeing the buffer
wrapper.

Fixes: 9a2e1233d38c ("iio: buffer: hw-consumer: remove redundant scan_mask flexible array")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
---
drivers/iio/buffer/industrialio-hw-consumer.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/iio/buffer/industrialio-hw-consumer.c b/drivers/iio/buffer/industrialio-hw-consumer.c
index 24d7df603760..d1ab2cbf8c88 100644
--- a/drivers/iio/buffer/industrialio-hw-consumer.c
+++ b/drivers/iio/buffer/industrialio-hw-consumer.c
@@ -40,6 +40,8 @@ static void iio_hw_buf_release(struct iio_buffer *buffer)
{
struct hw_consumer_buffer *hw_buf =
iio_buffer_to_hw_consumer_buffer(buffer);
+
+ bitmap_free(buffer->scan_mask);
kfree(hw_buf);
}

---
base-commit: 7080e32d3f09d8688c4a87d81bdcc71f7f606b16
change-id: 20260427-iio_buf-0459b3fa3de8

Best regards,
--
Felix Gu <ustc.gu@gmail.com>