From f2f18147c7dbb7a360697e83d3d8174c6449e104 Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Thu, 7 May 2020 09:42:52 +0000 Subject: [PATCH] gnss: sirf: fix error return code in sirf_probe() commit 43d7ce70ae43dd8523754b17f567417e0e75dbce upstream. Fix to return a negative error code from the error handling case instead of 0, as done elsewhere in this function. This avoids a use-after-free in case the driver is later unbound. Fixes: d2efbbd18b1e ("gnss: add driver for sirfstar-based receivers") Reported-by: Hulk Robot Signed-off-by: Wei Yongjun [ johan: amend commit message; mention potential use-after-free ] Cc: stable # 4.19 Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/gnss/sirf.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c index effed3a8d398..2ecb1d3e8eeb 100644 --- a/drivers/gnss/sirf.c +++ b/drivers/gnss/sirf.c @@ -439,14 +439,18 @@ static int sirf_probe(struct serdev_device *serdev) data->on_off = devm_gpiod_get_optional(dev, "sirf,onoff", GPIOD_OUT_LOW); - if (IS_ERR(data->on_off)) + if (IS_ERR(data->on_off)) { + ret = PTR_ERR(data->on_off); goto err_put_device; + } if (data->on_off) { data->wakeup = devm_gpiod_get_optional(dev, "sirf,wakeup", GPIOD_IN); - if (IS_ERR(data->wakeup)) + if (IS_ERR(data->wakeup)) { + ret = PTR_ERR(data->wakeup); goto err_put_device; + } ret = regulator_enable(data->vcc); if (ret)