This is a note to let you know that I've just added the patch titled
wifi: rtw88: Fix memory leak in rtw88_usb
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
wifi-rtw88-fix-memory-leak-in-rtw88_usb.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 93a649e2ce55e154cf496d0d04dad9461b754bb8
Author: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Date: Mon Apr 17 11:03:31 2023 -0500
wifi: rtw88: Fix memory leak in rtw88_usb
[ Upstream commit 59a3a312009723e3e5082899655fdcc420e2b47a ]
Kmemleak shows the following leak arising from routine in the usb
probe routine:
unreferenced object 0xffff895cb29bba00 (size 512):
comm "(udev-worker)", pid 534, jiffies 4294903932 (age 102751.088s)
hex dump (first 32 bytes):
77 30 30 30 00 00 00 00 02 2f 2d 2b 30 00 00 00 w000...../-+0...
02 00 2a 28 00 00 00 00 ff 55 ff ff ff 00 00 00 ..*(.....U......
backtrace:
[<ffffffff9265fa36>] kmalloc_trace+0x26/0x90
[<ffffffffc17eec41>] rtw_usb_probe+0x2f1/0x680 [rtw_usb]
[<ffffffffc03e19fd>] usb_probe_interface+0xdd/0x2e0 [usbcore]
[<ffffffff92b4f2fe>] really_probe+0x18e/0x3d0
[<ffffffff92b4f5b8>] __driver_probe_device+0x78/0x160
[<ffffffff92b4f6bf>] driver_probe_device+0x1f/0x90
[<ffffffff92b4f8df>] __driver_attach+0xbf/0x1b0
[<ffffffff92b4d350>] bus_for_each_dev+0x70/0xc0
[<ffffffff92b4e51e>] bus_add_driver+0x10e/0x210
[<ffffffff92b50935>] driver_register+0x55/0xf0
[<ffffffffc03e0708>] usb_register_driver+0x88/0x140 [usbcore]
[<ffffffff92401153>] do_one_initcall+0x43/0x210
[<ffffffff9254f42a>] do_init_module+0x4a/0x200
[<ffffffff92551d1c>] __do_sys_finit_module+0xac/0x120
[<ffffffff92ee6626>] do_syscall_64+0x56/0x80
[<ffffffff9300006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0
The leak was verified to be real by unloading the driver, which resulted
in a dangling pointer to the allocation.
The allocated memory is freed in rtw_usb_intf_deinit().
Signed-off-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Cc: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Cc: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Reviewed-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230417160331.23071-1-Larry.Finger@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/net/wireless/realtek/rtw88/usb.c b/drivers/net/wireless/realtek/rtw88/usb.c
index 8e2c99f9c3662..44a5fafb99055 100644
--- a/drivers/net/wireless/realtek/rtw88/usb.c
+++ b/drivers/net/wireless/realtek/rtw88/usb.c
@@ -804,6 +804,7 @@ static void rtw_usb_intf_deinit(struct rtw_dev *rtwdev,
struct rtw_usb *rtwusb = rtw_get_usb_priv(rtwdev);
usb_put_dev(rtwusb->udev);
+ kfree(rtwusb->usb_data);
usb_set_intfdata(intf, NULL);
}
