[PATCH 5.15 166/917] iio: buffer: Fix memory leak in iio_buffer_register_legacy_sysfs_groups()

[Greg Kroah-Hartman]

From: Yang Yingliang <yangyingliang@xxxxxxxxxx>

commit 604faf9a2ecd1addcc0c10a47e5aaef3c4d4fd6b upstream.

If the second iio_device_register_sysfs_group() fails,
'legacy_buffer_group.attrs' need be freed too or it will
cause memory leak:

unreferenced object 0xffff888003618280 (size 64):
  comm "xrun", pid 357, jiffies 4294907259 (age 22.296s)
  hex dump (first 32 bytes):
    80 f6 8c 03 80 88 ff ff 80 fb 8c 03 80 88 ff ff  ................
    00 f9 8c 03 80 88 ff ff 80 fc 8c 03 80 88 ff ff  ................
  backtrace:
    [<00000000076bfd43>] __kmalloc+0x1a3/0x2f0
    [<00000000c32e4886>] iio_buffers_alloc_sysfs_and_mask+0xc31/0x1290 [industrialio]

Reported-by: Hulk Robot <hulkci@xxxxxxxxxx>
Fixes: d9a625744ed0 ("iio: core: merge buffer/ & scan_elements/ attributes")
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211013144242.1685060-1-yangyingliang@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/iio/industrialio-buffer.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -1367,10 +1367,10 @@ static int iio_buffer_register_legacy_sy
 
 	return 0;
 
-error_free_buffer_attrs:
-	kfree(iio_dev_opaque->legacy_buffer_group.attrs);
 error_free_scan_el_attrs:
 	kfree(iio_dev_opaque->legacy_scan_el_group.attrs);
+error_free_buffer_attrs:
+	kfree(iio_dev_opaque->legacy_buffer_group.attrs);
 
 	return ret;
 }