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Bluetooth: btbcm: fix missing of_node_put() in btbcm_get_board_name()

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[ Upstream commit e42eec0f182ac0605e658145f6fe3b6a7c256c45 ]

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: 63fac3343b ("Bluetooth: btbcm: Support per-board firmware variants")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Javier Carrasco
2024-10-31 13:11:23 +01:00
committed by Greg Kroah-Hartman
parent 1219c211cc
commit 3397001cfa
1 changed files with 1 additions and 3 deletions
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4
drivers/bluetooth/btbcm.c
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@@ -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