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| author | Yang Yingliang <yangyingliang@huawei.com> | 2021-10-12 12:16:29 +0800 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2021-10-15 21:06:10 +0200 |
| commit | 24d23181e43d72ca692a479e70dfe5b0b5dd33f1 (patch) | |
| tree | b919f6af9cd9d6efc475e04c600af389b47b39f1 /drivers/rtc/class.c | |
| parent | 789c1093f02c436b320d78a739f9610c8271cb73 (diff) | |
| download | linux-24d23181e43d72ca692a479e70dfe5b0b5dd33f1.tar.gz | |
rtc: class: check return value when calling dev_set_name()
I got a null-ptr-deref report when doing fault injection test:
BUG: kernel NULL pointer dereference, address: 0000000000000000
RIP: 0010:strcmp+0xc/0x20
Call Trace:
__devm_rtc_register_device.cold.7+0x16a/0x2df
rv3029_probe+0x4b1/0x770 [rtc_rv3029c2]
rv3029_i2c_probe+0x141/0x180 [rtc_rv3029c2]
i2c_device_probe+0xa07/0xbb0
really_probe+0x285/0xc30
If dev_set_name() fails, dev_name() is null, it causes null-ptr-deref,
we need check the return value of dev_set_name().
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20211012041629.2504158-1-yangyingliang@huawei.com
Diffstat (limited to 'drivers/rtc/class.c')
| -rw-r--r-- | drivers/rtc/class.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index 654e921244bff..dbccd71589b9d 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -364,7 +364,9 @@ struct rtc_device *devm_rtc_allocate_device(struct device *dev) rtc->id = id; rtc->dev.parent = dev; - dev_set_name(&rtc->dev, "rtc%d", id); + err = dev_set_name(&rtc->dev, "rtc%d", id); + if (err) + return ERR_PTR(err); err = devm_add_action_or_reset(dev, devm_rtc_release_device, rtc); if (err) |