From mboxrd@z Thu Jan 1 00:00:00 1970 From: Colin King Date: Sat, 22 Dec 2018 11:31:59 +0000 Subject: [PATCH][V2][next] regulator: axp20x: check rdev is null before dereferencing it Message-Id: <20181222113159.31029-1-colin.king@canonical.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Liam Girdwood , Mark Brown , Chen-Yu Tsai Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org From: Colin Ian King Currently rdev is dereferenced when assigning desc before rdev is null checked, hence there is a potential null pointer dereference on rdev. Fix this by null checking rdev first. Detected by CoverityScan, CID#1476031 ("Dereference before null check") Fixes: 77e3e3b165db ("regulator: axp20x: add software based soft_start for AXP209 LDO3") Signed-off-by: Colin Ian King --- V2: Fix 2nd occurrance of this thinko --- drivers/regulator/axp20x-regulator.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/regulator/axp20x-regulator.c b/drivers/regulator/axp20x-regulator.c index 48af859fd053..0dfa4ea6bbdf 100644 --- a/drivers/regulator/axp20x-regulator.c +++ b/drivers/regulator/axp20x-regulator.c @@ -367,7 +367,7 @@ static const int axp209_dcdc2_ldo3_slew_rates[] = { static int axp20x_set_ramp_delay(struct regulator_dev *rdev, int ramp) { struct axp20x_dev *axp20x = rdev_get_drvdata(rdev); - const struct regulator_desc *desc = rdev->desc; + const struct regulator_desc *desc; u8 reg, mask, enable, cfg = 0xff; const int *slew_rates; int rate_count = 0; @@ -375,6 +375,8 @@ static int axp20x_set_ramp_delay(struct regulator_dev *rdev, int ramp) if (!rdev) return -EINVAL; + desc = rdev->desc; + switch (axp20x->variant) { case AXP209_ID: if (desc->id = AXP20X_DCDC2) { @@ -436,11 +438,13 @@ static int axp20x_set_ramp_delay(struct regulator_dev *rdev, int ramp) static int axp20x_regulator_enable_regmap(struct regulator_dev *rdev) { struct axp20x_dev *axp20x = rdev_get_drvdata(rdev); - const struct regulator_desc *desc = rdev->desc; + const struct regulator_desc *desc; if (!rdev) return -EINVAL; + desc = rdev->desc; + switch (axp20x->variant) { case AXP209_ID: if ((desc->id = AXP20X_LDO3) && -- 2.19.1