[PATCH] regulator: core: Fix rdev reference leak in regulator_resolve_supply()

[Wentao Liang]

regulator_resolve_supply() takes a reference on the looked-up regulator
with regulator_dev_lookup(), but when the supply resolves to the
regulator itself that reference is never dropped: it leaks on the early
return and is lost as well when r is replaced with the dummy regulator.

Release the reference before handling the self-referent case.

Fixes: 4b639e254d3d ("regulator: avoid resolve_supply() infinite recursion")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Wentao Liang <vulab@xxxxxxxxxxx>
---
 drivers/regulator/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 0ae11a521943..31893c7decd5 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -2221,6 +2221,7 @@ static int regulator_resolve_supply(struct regulator_dev *rdev)
 	if (r == rdev) {
 		dev_err(dev, "Supply for %s (%s) resolved to itself\n",
 			rdev->desc->name, rdev->supply_name);
+		put_device(&rdev->dev);
 		if (!have_full_constraints()) {
 			ret = -EINVAL;
 			goto out;
-- 
2.34.1