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gnss: sirf: fix error return code in sirf_probe()

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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: d2efbbd18b ("gnss: add driver for sirfstar-based receivers")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
[ johan: amend commit message; mention potential use-after-free ]
Cc: stable <stable@vger.kernel.org>	# 4.19
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wei Yongjun 2020-05-07 09:42:52 +00:00 committed by Greg Kroah-Hartman
parent cb345e7f3e
commit 621dbec36b
1 changed files with 6 additions and 2 deletions
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8
drivers/gnss/sirf.c
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@ -292,14 +292,18 @@ 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;
}
/*
* Configurations where WAKEUP has been left not connected,