staging: rtl8188eu: avoid a null dereference on pmlmepriv

[ Upstream commit 123c0aab0050cd0e07ce18e453389fbbb0a5a425 ]

There is a check on pmlmepriv before dereferencing it when
vfree'ing pmlmepriv->free_bss_buf however the previous call
to rtw_free_mlme_priv_ie_data deferences pmlmepriv causing
a null pointer deference if it is null.  Avoid this by also
calling rtw_free_mlme_priv_ie_data if the pointer is non-null.

Detected by CoverityScan, CID#1230262 ("Dereference before null check")
Fixes: 7b464c9fa5cc ("staging: r8188eu: Add files for new driver - part 4")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/rtl8188eu/core/rtw_mlme.c b/drivers/staging/rtl8188eu/core/rtw_mlme.c
index ee2dcd0..0b60d1e 100644 (file)
--- a/drivers/staging/rtl8188eu/core/rtw_mlme.c
+++ b/drivers/staging/rtl8188eu/core/rtw_mlme.c
@@ -107,10 +107,10 @@ void rtw_free_mlme_priv_ie_data(struct mlme_priv *pmlmepriv)
 
 void rtw_free_mlme_priv(struct mlme_priv *pmlmepriv)
 {
-       rtw_free_mlme_priv_ie_data(pmlmepriv);
-
-       if (pmlmepriv)
+       if (pmlmepriv) {
+               rtw_free_mlme_priv_ie_data(pmlmepriv);
                vfree(pmlmepriv->free_bss_buf);
+       }
 }
 
 struct wlan_network *_rtw_alloc_network(struct mlme_priv *pmlmepriv)