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authorMichał Mirosław <mirq-linux@rere.qmqm.pl>2020-11-13 01:20:28 +0100
committerMark Brown <broonie@kernel.org>2020-11-13 14:21:25 +0000
commit4b639e254d3d4f15ee4ff2b890a447204cfbeea9 (patch)
treed87da44786be57215e6308d049e63e4589f7969c /drivers/regulator
parent57a6ad482af256b2a13de14194fb8f67c1a65f10 (diff)
regulator: avoid resolve_supply() infinite recursion
When a regulator's name equals its supply's name the regulator_resolve_supply() recurses indefinitely. Add a check so that debugging the problem is easier. The "fixed" commit just exposed the problem. Fixes: aea6cb99703e ("regulator: resolve supply after creating regulator") Cc: stable@vger.kernel.org Reported-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl> Tested-by: Ahmad Fatoum <a.fatoum@pengutronix.de> # stpmic1 Link: https://lore.kernel.org/r/c6171057cfc0896f950c4d8cb82df0f9f1b89ad9.1605226675.git.mirq-linux@rere.qmqm.pl Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/regulator')
-rw-r--r--drivers/regulator/core.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/regulator/core.c b/drivers/regulator/core.c
index 84dd0aea97c5..d3b96efa20fd 100644
--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1841,6 +1841,12 @@ 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);
+ return -EINVAL;
+ }
+
/*
* If the supply's parent device is not the same as the
* regulator's parent device, then ensure the parent device