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iio: core: check return value when calling dev_set_name()

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I got a null-ptr-deref report when doing fault injection test:

BUG: kernel NULL pointer dereference, address: 0000000000000000
RIP: 0010:strlen+0x0/0x20
Call Trace:
 start_creating+0x199/0x2f0
 debugfs_create_dir+0x25/0x430
 __iio_device_register+0x4da/0x1b40 [industrialio]
 __devm_iio_device_register+0x22/0x80 [industrialio]
 max1027_probe+0x639/0x860 [max1027]
 spi_probe+0x183/0x210
 really_probe+0x285/0xc30

If dev_set_name() fails, the dev_name() is null, check the return
value of dev_set_name() to avoid the null-ptr-deref.

Reported-by: Hulk Robot <hulkci@huawei.com>
Fixes: e553f182d5 ("staging: iio: core: Introduce debugfs support...")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20211012063624.3167460-1-yangyingliang@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Yang Yingliang 2021-10-12 14:36:24 +08:00 committed by Jonathan Cameron
parent 604faf9a2e
commit fe6f45f6ba
1 changed files with 7 additions and 1 deletions
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8
drivers/iio/industrialio-core.c
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@ -1664,7 +1664,13 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
kfree(iio_dev_opaque);
return NULL;
}
dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id);
if (dev_set_name(&indio_dev->dev, "iio:device%d", iio_dev_opaque->id)) {
ida_simple_remove(&iio_ida, iio_dev_opaque->id);
kfree(iio_dev_opaque);
return NULL;
}
INIT_LIST_HEAD(&iio_dev_opaque->buffer_list);
INIT_LIST_HEAD(&iio_dev_opaque->ioctl_handlers);