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@xxxxxxxxxx> Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx> --- v2: drop some unuseful backtrace in commit message. --- drivers/rtc/class.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/rtc/class.c b/drivers/rtc/class.c index f77bc089eb6b..1f18c39a4b82 100644 --- a/drivers/rtc/class.c +++ b/drivers/rtc/class.c @@ -363,7 +363,9 @@ 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) -- 2.25.1
