From 1646566b5e0c556f779180a8514e521ac735de1e Mon Sep 17 00:00:00 2001
From: Wei Yongjun <weiyongjun1@huawei.com>
Date: Fri, 17 Dec 2021 16:34:28 +0800
Subject: [PATCH] usb: ftdi-elan: fix memory leak on device disconnect
Git-commit: 1646566b5e0c556f779180a8514e521ac735de1e
Patch-mainline: v5.17-rc1
References: git-fixes
'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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
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 e5a8fcdbb78e..6c38c62d29b2 100644
--- a/drivers/usb/misc/ftdi-elan.c
+++ b/drivers/usb/misc/ftdi-elan.c
@@ -202,6 +202,7 @@ 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)
--
2.31.1