From: Connor Kuehl connor.kuehl@canonical.com
[ Upstream commit 228241944a48113470d3c3b46c88ba7fbe0a274b ]
Inside a nested 'else' block at the beginning of this function is a call that assigns 'psta' to the return value of 'rtw_get_stainfo()'. If 'rtw_get_stainfo()' returns NULL and the flow of control reaches the 'else if' where 'psta' is dereferenced, then we will dereference a NULL pointer.
Fix this by checking if 'psta' is not NULL before reading its 'psta->qos_option' data member.
Addresses-Coverity: ("Dereference null return value")
Signed-off-by: Connor Kuehl connor.kuehl@canonical.com Acked-by: Larry Finger Larry.Finger@lwfinger.net Link: https://lore.kernel.org/r/20190926150317.5894-1-connor.kuehl@canonical.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/staging/rtl8188eu/core/rtw_xmit.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/rtl8188eu/core/rtw_xmit.c b/drivers/staging/rtl8188eu/core/rtw_xmit.c index 0f8b8e0bffdf9..dedc313e9dea7 100644 --- a/drivers/staging/rtl8188eu/core/rtw_xmit.c +++ b/drivers/staging/rtl8188eu/core/rtw_xmit.c @@ -805,7 +805,7 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr memcpy(pwlanhdr->addr2, get_bssid(pmlmepriv), ETH_ALEN); memcpy(pwlanhdr->addr3, pattrib->src, ETH_ALEN);
- if (psta->qos_option) + if (psta && psta->qos_option) qos_option = true; } else if (check_fwstate(pmlmepriv, WIFI_ADHOC_STATE) || check_fwstate(pmlmepriv, WIFI_ADHOC_MASTER_STATE)) { @@ -813,7 +813,7 @@ s32 rtw_make_wlanhdr(struct adapter *padapter, u8 *hdr, struct pkt_attrib *pattr memcpy(pwlanhdr->addr2, pattrib->src, ETH_ALEN); memcpy(pwlanhdr->addr3, get_bssid(pmlmepriv), ETH_ALEN);
- if (psta->qos_option) + if (psta && psta->qos_option) qos_option = true; } else { RT_TRACE(_module_rtl871x_xmit_c_, _drv_err_, ("fw_state:%x is not allowed to xmit frame\n", get_fwstate(pmlmepriv)));