4.4-stable review patch. If anyone has any objections, please let me know.
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From: Roger Quadros rogerq@ti.com
[ Upstream commit 9fe172b9be532acc23e35ba693700383ab775e66 ]
extcon-palmas must be child of palmas and expects parent's drvdata to be valid. Check for non NULL parent drvdata and fail if it is NULL. Not doing so will result in a NULL pointer dereference later in the probe() parent drvdata is NULL (e.g. misplaced extcon-palmas node in device tree).
Signed-off-by: Roger Quadros rogerq@ti.com Signed-off-by: Chanwoo Choi cw00.choi@samsung.com Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/extcon/extcon-palmas.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/drivers/extcon/extcon-palmas.c +++ b/drivers/extcon/extcon-palmas.c @@ -190,6 +190,11 @@ static int palmas_usb_probe(struct platf struct palmas_usb *palmas_usb; int status;
+ if (!palmas) { + dev_err(&pdev->dev, "failed to get valid parent\n"); + return -EINVAL; + } + palmas_usb = devm_kzalloc(&pdev->dev, sizeof(*palmas_usb), GFP_KERNEL); if (!palmas_usb) return -ENOMEM;