On Tue, 28 Aug 2018, Stefan Agner wrote:

Make sure to free the custom input node name on disconnect.

Cc: stable@vger.kernel.org # v4.18+ Fixes: c554bb045511 ("HID: input: append a suffix matching the application") Signed-off-by: Stefan Agner stefan@agner.ch

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Found with kmemleak, after unplugging a Logitech Unifying receiver:

unreferenced object 0xc2345b80 (size 64): comm "kworker/0:1", pid 20, jiffies 4294955181 (age 320.740s) hex dump (first 32 bytes): 4c 6f 67 69 74 65 63 68 20 55 53 42 20 52 65 63 Logitech USB Rec 65 69 76 65 72 20 53 79 73 74 65 6d 20 43 6f 6e eiver System Con backtrace: [<8fec5a71>] __kmalloc_track_caller+0x1dc/0x300 [<5b926275>] kvasprintf+0x60/0xcc [<21fc360f>] kasprintf+0x38/0x54 [<3b6ce9f0>] hidinput_connect+0x23a8/0x4c60 [<deaab707>] hid_connect+0x30c/0x38c [<5a28f7c9>] hid_hw_start+0x44/0x64 [<267d70e8>] hid_generic_probe+0x34/0x38 [<d68c31b1>] hid_device_probe+0xdc/0x13c [<09414e91>] really_probe+0x1d8/0x2c4 [<f9d7157f>] driver_probe_device+0x68/0x184 [<1def17c8>] __device_attach_driver+0xa0/0xd4 [<d3b2081b>] bus_for_each_drv+0x60/0xc0 [<379d02f8>] __device_attach+0xdc/0x144 [<7026ace5>] device_initial_probe+0x14/0x18 [<44527d01>] bus_probe_device+0x90/0x98 [<cf58bf2f>] device_add+0x424/0x62c

drivers/hid/hid-input.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index 4e94ea3e280a..ac201817a2dd 100644 --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -1815,6 +1815,7 @@ void hidinput_disconnect(struct hid_device *hid) input_unregister_device(hidinput->input); else input_free_device(hidinput->input);

• kfree(hidinput->name);
  

  kfree(hidinput);

Applied for 4.19, thanks.