From: Larry Finger Larry.Finger@lwfinger.net
[ 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@lwfinger.net Cc: Sascha Hauer s.hauer@pengutronix.de Cc: Ping-Ke Shih pkshih@realtek.com Reviewed-by: Ping-Ke Shih pkshih@realtek.com Signed-off-by: Kalle Valo kvalo@kernel.org Link: https://lore.kernel.org/r/20230417160331.23071-1-Larry.Finger@lwfinger.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/wireless/realtek/rtw88/usb.c | 1 + 1 file changed, 1 insertion(+)
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); }