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iio: trigger: sysfs: fix possible memory leak in iio_sysfs_trig_init()

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commit efa17e90e1 upstream.

dev_set_name() allocates memory for name, it need be freed
when device_add() fails, call put_device() to give up the
reference that hold in device_initialize(), so that it can
be freed in kobject_cleanup() when the refcount hit to 0.

Fault injection test can trigger this:

unreferenced object 0xffff8e8340a7b4c0 (size 32):
  comm "modprobe", pid 243, jiffies 4294678145 (age 48.845s)
  hex dump (first 32 bytes):
    69 69 6f 5f 73 79 73 66 73 5f 74 72 69 67 67 65  iio_sysfs_trigge
    72 00 a7 40 83 8e ff ff 00 86 13 c4 f6 ee ff ff  r..@............
  backtrace:
    [<0000000074999de8>] __kmem_cache_alloc_node+0x1e9/0x360
    [<00000000497fd30b>] __kmalloc_node_track_caller+0x44/0x1a0
    [<000000003636c520>] kstrdup+0x2d/0x60
    [<0000000032f84da2>] kobject_set_name_vargs+0x1e/0x90
    [<0000000092efe493>] dev_set_name+0x4e/0x70

Fixes: 1f785681a8 ("staging:iio:trigger sysfs userspace trigger rework.")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20221022074212.1386424-1-yangyingliang@huawei.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yang Yingliang 2022-10-22 15:42:12 +08:00 committed by Greg Kroah-Hartman
parent 7b75515728
commit 0dd52e141a
1 changed files with 5 additions and 1 deletions
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6
drivers/iio/trigger/iio-trig-sysfs.c
View file

@ -209,9 +209,13 @@ static int iio_sysfs_trigger_remove(int id)
static int __init iio_sysfs_trig_init(void)
{
int ret;
device_initialize(&iio_sysfs_trig_dev);
dev_set_name(&iio_sysfs_trig_dev, "iio_sysfs_trigger");
return device_add(&iio_sysfs_trig_dev);
ret = device_add(&iio_sysfs_trig_dev);
if (ret)
put_device(&iio_sysfs_trig_dev);
return ret;
}
module_init(iio_sysfs_trig_init);