This is a note to let you know that I've just added the patch titled regulator: avoid resolve_supply() infinite recursion to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: regulator-avoid-resolve_supply-infinite-recursion.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 4b639e254d3d4f15ee4ff2b890a447204cfbeea9 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@xxxxxxxxxxxx> Date: Fri, 13 Nov 2020 01:20:28 +0100 Subject: regulator: avoid resolve_supply() infinite recursion MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michał Mirosław <mirq-linux@xxxxxxxxxxxx> commit 4b639e254d3d4f15ee4ff2b890a447204cfbeea9 upstream. 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@xxxxxxxxxxxxxxx Reported-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> Signed-off-by: Michał Mirosław <mirq-linux@xxxxxxxxxxxx> Tested-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx> # stpmic1 Link: https://lore.kernel.org/r/c6171057cfc0896f950c4d8cb82df0f9f1b89ad9.1605226675.git.mirq-linux@xxxxxxxxxxxx Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/regulator/core.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/drivers/regulator/core.c +++ b/drivers/regulator/core.c @@ -1595,6 +1595,12 @@ static int regulator_resolve_supply(stru } } + 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 Patches currently in stable-queue which might be from mirq-linux@xxxxxxxxxxxx are queue-4.19/regulator-fix-memory-leak-with-repeated-set_machine_constraints.patch queue-4.19/regulator-avoid-resolve_supply-infinite-recursion.patch queue-4.19/regulator-workaround-self-referent-regulators.patch