of_find_node_by_path() returns a pointer to a device_node with its
refcount incremented, and a call to of_node_put() is required to
decrement the refcount again and avoid leaking the resource.
If 'of_property_read_string_index(root, "compatible", 0, &tmp)' fails,
the function returns without calling of_node_put(root) before doing so.
The automatic cleanup attribute can be used by means of the __free()
macro to automatically call of_node_put() when the variable goes out of
scope, fixing the issue and also accounting for new error paths.
Fixes: 63fac3343b99 ("Bluetooth: btbcm: Support per-board firmware variants")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
---
Changes in v2:
- Squash patches for mainline solution without intermediate steps.
- Link to v1: https://lore.kernel.org/r/20241030-bluetooth-btbcm-node-cleanup-v1-0-fdc4b9df9fe3@xxxxxxxxx
---
drivers/bluetooth/btbcm.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/bluetooth/btbcm.c b/drivers/bluetooth/btbcm.c
index eef00467905e..a1153ada74d2 100644
--- a/drivers/bluetooth/btbcm.c
+++ b/drivers/bluetooth/btbcm.c
@@ -541,11 +541,10 @@ static const struct bcm_subver_table bcm_usb_subver_table[] = {
static const char *btbcm_get_board_name(struct device *dev)
{
#ifdef CONFIG_OF
- struct device_node *root;
+ struct device_node *root __free(device_node) = of_find_node_by_path("/");
char *board_type;
const char *tmp;
- root = of_find_node_by_path("/");
if (!root)
return NULL;
@@ -555,7 +554,6 @@ static const char *btbcm_get_board_name(struct device *dev)
/* get rid of any '/' in the compatible string */
board_type = devm_kstrdup(dev, tmp, GFP_KERNEL);
strreplace(board_type, '/', '-');
- of_node_put(root);
return board_type;
#else
---
base-commit: 6fb2fa9805c501d9ade047fc511961f3273cdcb5
change-id: 20241030-bluetooth-btbcm-node-cleanup-23d21a73870c
Best regards,
--
Javier Carrasco <javier.carrasco.cruz@xxxxxxxxx>
