linux-kernel - [PATCH 4.4 13/43] regulator: core: Clear the supply pointer if enabling fails

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Message-Id: <20170501212600.068430884@linuxfoundation.org>
Date:   Mon,  1 May 2017 14:27:13 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jon Hunter <jonathanh@...dia.com>,
        Mark Brown <broonie@...nel.org>,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH 4.4 13/43] regulator: core: Clear the supply pointer if enabling fails

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jon Hunter <jonathanh@...dia.com>

commit 8e5356a73604f53da6a1e0756727cb8f9f7bba17 upstream.

During the resolution of a regulator's supply, we may attempt to enable
the supply if the regulator itself is already enabled. If enabling the
supply fails, then we will call _regulator_put() for the supply.
However, the pointer to the supply has not been cleared for the
regulator and this will cause a crash if we then unregister the
regulator and attempt to call regulator_put() a second time for the
supply. Fix this by clearing the supply pointer if enabling the supply
after fails when resolving the supply for a regulator.

Signed-off-by: Jon Hunter <jonathanh@...dia.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: Julia Lawall <julia.lawall@...6.fr>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/regulator/core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/regulator/core.c
+++ b/drivers/regulator/core.c
@@ -1519,6 +1519,7 @@ static int regulator_resolve_supply(stru
 		ret = regulator_enable(rdev->supply);
 		if (ret < 0) {
 			_regulator_put(rdev->supply);
+			rdev->supply = NULL;
 			return ret;
 		}
 	}