staging: r8188eu: proper error handling in rtw_init_drv_sw

The code inside rtw_init_drv_sw() calls various init functions to
populate the padapter structure and checks for their return values
respectively.
But if one of the functions in middle fails then it simply returns
_FAIL instead of proper logging and calling freeing counterparts
of previous init functions.
This leads to various memory leaks and can be found in
/sys/kernel/debug/kmemleak if kernel is compiled with DEBUG_KMEMLEAK=y.

Fix this and keep the success and error separate.

Fixes: 2b42bd58b321 ("staging: r8188eu: introduce new os_dep dir for RTL8188eu driver")
Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Pavel Skripkin <paskripkin@gmail.com>
Signed-off-by: Vihas Makwana <makvihas@gmail.com>
Link: https://lore.kernel.org/r/20220309205047.45981-3-makvihas@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/r8188eu/os_dep/os_intfs.c b/drivers/staging/r8188eu/os_dep/os_intfs.c
index 1975684..550721e 100644 (file)
--- a/drivers/staging/r8188eu/os_dep/os_intfs.c
+++ b/drivers/staging/r8188eu/os_dep/os_intfs.c
@@ -469,32 +469,46 @@ u8 rtw_reset_drv_sw(struct adapter *padapter)
 
 u8 rtw_init_drv_sw(struct adapter *padapter)
 {
-       if ((rtw_init_cmd_priv(&padapter->cmdpriv)) == _FAIL)
+       if ((rtw_init_cmd_priv(&padapter->cmdpriv)) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "rtw_init_cmd_priv failed\n");
                return _FAIL;
+       }
 
        padapter->cmdpriv.padapter = padapter;
 
-       if ((rtw_init_evt_priv(&padapter->evtpriv)) == _FAIL)
-               return _FAIL;
+       if ((rtw_init_evt_priv(&padapter->evtpriv)) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "rtw_init_evt_priv failed\n");
+               goto free_cmd_priv;
+       }
 
-       if (rtw_init_mlme_priv(padapter) == _FAIL)
-               return _FAIL;
+       if (rtw_init_mlme_priv(padapter) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "rtw_init_mlme_priv failed\n");
+               goto free_evt_priv;
+       }
 
        rtw_init_wifidirect_timers(padapter);
        init_wifidirect_info(padapter, P2P_ROLE_DISABLE);
        reset_global_wifidirect_info(padapter);
 
-       if (init_mlme_ext_priv(padapter) == _FAIL)
-               return _FAIL;
+       if (init_mlme_ext_priv(padapter) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "init_mlme_ext_priv failed\n");
+               goto free_mlme_priv;
+       }
 
-       if (_rtw_init_xmit_priv(&padapter->xmitpriv, padapter) == _FAIL)
-               return _FAIL;
+       if (_rtw_init_xmit_priv(&padapter->xmitpriv, padapter) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "_rtw_init_xmit_priv failed\n");
+               goto free_mlme_ext;
+       }
 
-       if (_rtw_init_recv_priv(&padapter->recvpriv, padapter) == _FAIL)
-               return _FAIL;
+       if (_rtw_init_recv_priv(&padapter->recvpriv, padapter) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "_rtw_init_recv_priv failed\n");
+               goto free_xmit_priv;
+       }
 
-       if (_rtw_init_sta_priv(&padapter->stapriv) == _FAIL)
-               return _FAIL;
+       if (_rtw_init_sta_priv(&padapter->stapriv) == _FAIL) {
+               dev_err(dvobj_to_dev(padapter->dvobj), "_rtw_init_sta_priv failed\n");
+               goto free_recv_priv;
+       }
 
        padapter->stapriv.padapter = padapter;
 
@@ -510,6 +524,26 @@ u8 rtw_init_drv_sw(struct adapter *padapter)
        spin_lock_init(&padapter->br_ext_lock);
 
        return _SUCCESS;
+
+free_recv_priv:
+       _rtw_free_recv_priv(&padapter->recvpriv);
+
+free_xmit_priv:
+       _rtw_free_xmit_priv(&padapter->xmitpriv);
+
+free_mlme_ext:
+       free_mlme_ext_priv(&padapter->mlmeextpriv);
+
+free_mlme_priv:
+       rtw_free_mlme_priv(&padapter->mlmepriv);
+
+free_evt_priv:
+       rtw_free_evt_priv(&padapter->evtpriv);
+
+free_cmd_priv:
+       rtw_free_cmd_priv(&padapter->cmdpriv);
+
+       return _FAIL;
 }
 
 void rtw_cancel_all_timer(struct adapter *padapter)