From: Wei Yongjun weiyongjun1@huawei.com
[ Upstream commit 1646566b5e0c556f779180a8514e521ac735de1e ]
'ftdi' is alloced when probe device, but not free on device disconnect, this cause a memory leak as follows:
unreferenced object 0xffff88800d584000 (size 8400): comm "kworker/0:2", pid 3809, jiffies 4295453055 (age 13.784s) hex dump (first 32 bytes): 00 40 58 0d 80 88 ff ff 00 40 58 0d 80 88 ff ff .@X......@X..... 00 00 00 00 00 00 00 00 00 00 00 00 ad 4e ad de .............N.. backtrace: [<000000000d47f947>] kmalloc_order_trace+0x19/0x110 mm/slab_common.c:960 [<000000008548ac68>] ftdi_elan_probe+0x8c/0x880 drivers/usb/misc/ftdi-elan.c:2647 [<000000007f73e422>] usb_probe_interface+0x31b/0x800 drivers/usb/core/driver.c:396 [<00000000fe8d07fc>] really_probe+0x299/0xc30 drivers/base/dd.c:517 [<0000000005da7d32>] __driver_probe_device+0x357/0x500 drivers/base/dd.c:751 [<000000003c2c9579>] driver_probe_device+0x4e/0x140 drivers/base/dd.c:781
Fix it by freeing 'ftdi' after nobody use it.
Fixes: a5c66e4b2418 ("USB: ftdi-elan: client driver for ELAN Uxxx adapters") Reported-by: Hulk Robot hulkci@huawei.com Signed-off-by: Wei Yongjun weiyongjun1@huawei.com Link: https://lore.kernel.org/r/20211217083428.2441-1-weiyongjun1@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/usb/misc/ftdi-elan.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/usb/misc/ftdi-elan.c b/drivers/usb/misc/ftdi-elan.c index 424ff12f3b51f..0231c0cc6481d 100644 --- a/drivers/usb/misc/ftdi-elan.c +++ b/drivers/usb/misc/ftdi-elan.c @@ -206,6 +206,7 @@ static void ftdi_elan_delete(struct kref *kref) mutex_unlock(&ftdi_module_lock); kfree(ftdi->bulk_in_buffer); ftdi->bulk_in_buffer = NULL; + kfree(ftdi); }
static void ftdi_elan_put_kref(struct usb_ftdi *ftdi)