[PATCH] staging: rtl8723bs: avoid null pointer dereference on pmlmepriv

From: Colin King
Date: Wed Sep 20 2017 - 13:34:29 EST

From: Colin Ian King <colin.king@xxxxxxxxxxxxx>

There is a check to see if pmlmepriv is null before vfree'ing
pmlmepriv->free_bss_buf hence implying pmlmepriv could potenially be
null. However, a previous call to rtw_free_mlme_priv_ie_data
can also dereference pmlmepriv, so move this call so that it is only
called if pmlmepriv non-null.

Detected by CoverityScan, CID#1077739 ("Dereference before null check")

Fixes: 554c0a3abf21 ("staging: Add rtl8723bs sdio wifi driver")
Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
drivers/staging/rtl8723bs/core/rtw_mlme.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/staging/rtl8723bs/core/rtw_mlme.c b/drivers/staging/rtl8723bs/core/rtw_mlme.c
index 37b683d4d1fa..0d94ced985c0 100644
--- a/drivers/staging/rtl8723bs/core/rtw_mlme.c
+++ b/drivers/staging/rtl8723bs/core/rtw_mlme.c
@@ -119,9 +119,8 @@ 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) {
+ rtw_free_mlme_priv_ie_data(pmlmepriv);
if (pmlmepriv->free_bss_buf) {