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Date: Mon, 7 Jan 2013 23:09:53 +0100
From: Peter Huewe <peterhuewe@....de>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Devendra Naga <devendra.aaru@...il.com>,
Marcos Paulo de Souza <marcos.souza.org@...il.com>,
Priit Laes <plaes@...es.org>, devel@...verdev.osuosl.org,
linux-kernel@...r.kernel.org, Peter Huewe <peterhuewe@....de>
Subject: [PATCH] staging/csr: Fix dereference before check
Smatch complains about some pointers that are dereferenced before being
checked:
drivers/staging/csr/sme_sys.c:285
CsrWifiRouterCtrlHipReqHandler() warn: variable dereferenced before
check 'priv' (see line 283)
drivers/staging/csr/sme_sys.c:1503
CsrWifiRouterMaPacketReqHandler() warn: variable dereferenced before
check 'priv' (see line 1501)
drivers/staging/csr/sme_sys.c:2062
CsrWifiRouterCtrlPeerDelReqHandler() warn: variable dereferenced before
check 'priv' (see line 2059)
drivers/staging/csr/sme_sys.c:2477
CsrWifiRouterCtrlPeerAddReqHandler() warn: variable dereferenced before
check 'priv' (see line 2474)
drivers/staging/csr/sme_sys.c:3045
CsrWifiRouterCtrlWapiRxPktReqHandler() warn: variable dereferenced
before check 'priv' (see line 3039)
We put the check before the dereferencing and prevent an oops and fix
the warning.
Signed-off-by: Peter Huewe <peterhuewe@....de>
---
drivers/staging/csr/sme_sys.c | 41 ++++++++++++++++++++++++++---------------
1 files changed, 26 insertions(+), 15 deletions(-)
diff --git a/drivers/staging/csr/sme_sys.c b/drivers/staging/csr/sme_sys.c
index 2b06819..b1151a2 100644
--- a/drivers/staging/csr/sme_sys.c
+++ b/drivers/staging/csr/sme_sys.c
@@ -280,7 +280,7 @@ void CsrWifiRouterCtrlHipReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
CSR_SIGNAL *signal;
u16 interfaceTag = 0;
CSR_MA_PACKET_REQUEST *req;
- netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];
+ netInterface_priv_t *interfacePriv;
if (priv == NULL) {
return;
@@ -294,6 +294,8 @@ void CsrWifiRouterCtrlHipReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
return;
}
+ interfacePriv = priv->interfacePriv[interfaceTag];
+
/* Initialize bulkdata to avoid os_net_buf is garbage */
memset(&bulkdata, 0, sizeof(bulk_data_param_t));
@@ -1498,7 +1500,7 @@ void CsrWifiRouterMaPacketReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
u8 *daddr, *saddr;
u16 interfaceTag = mareq->interfaceTag & 0x00ff;
int queue;
- netInterface_priv_t *interfacePriv = priv->interfacePriv[interfaceTag];
+ netInterface_priv_t *interfacePriv;
if (!mareq->frame || !priv || !priv->smepriv)
{
@@ -1510,6 +1512,8 @@ void CsrWifiRouterMaPacketReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
unifi_error(priv, "CsrWifiRouterMaPacketReqHandler: interfaceID >= CSR_WIFI_NUM_INTERFACES.\n");
return;
}
+
+ interfacePriv = priv->interfacePriv[interfaceTag];
/* get a pointer to dest & source Mac address */
daddr = mareq->frame;
saddr = (mareq->frame + ETH_ALEN);
@@ -2056,9 +2060,9 @@ void CsrWifiRouterCtrlPeerDelReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
CsrWifiRouterCtrlPeerDelReq* req = (CsrWifiRouterCtrlPeerDelReq*)msg;
CsrResult status = CSR_RESULT_SUCCESS;
unifi_priv_t *priv = (unifi_priv_t*)drvpriv;
- netInterface_priv_t *interfacePriv = priv->interfacePriv[req->interfaceTag];
+ netInterface_priv_t *interfacePriv;
- unifi_trace(priv, UDBG2, "entering CsrWifiRouterCtrlPeerDelReqHandler \n");
+ unifi_trace(priv, UDBG2, "entering CsrWifiRouterCtrlPeerDelReqHandler\n");
if (priv == NULL)
{
unifi_error(priv, "CsrWifiRouterCtrlPeerDelReqHandler: invalid smepriv\n");
@@ -2071,6 +2075,8 @@ void CsrWifiRouterCtrlPeerDelReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
return;
}
+ interfacePriv = priv->interfacePriv[req->interfaceTag];
+
switch(interfacePriv->interfaceMode)
{
case CSR_WIFI_ROUTER_CTRL_MODE_AP:
@@ -2471,7 +2477,7 @@ void CsrWifiRouterCtrlPeerAddReqHandler(void* drvpriv,CsrWifiFsmEvent* msg)
CsrResult status = CSR_RESULT_SUCCESS;
unifi_priv_t *priv = (unifi_priv_t*)drvpriv;
u32 handle = 0;
- netInterface_priv_t *interfacePriv = priv->interfacePriv[req->interfaceTag];
+ netInterface_priv_t *interfacePriv;
unifi_trace(priv, UDBG2, "entering CsrWifiRouterCtrlPeerAddReqHandler \n");
if (priv == NULL)
@@ -2486,6 +2492,8 @@ void CsrWifiRouterCtrlPeerAddReqHandler(void* drvpriv,CsrWifiFsmEvent* msg)
return;
}
+ interfacePriv = priv->interfacePriv[req->interfaceTag];
+
switch(interfacePriv->interfaceMode)
{
case CSR_WIFI_ROUTER_CTRL_MODE_AP:
@@ -3036,21 +3044,24 @@ void CsrWifiRouterCtrlWapiRxPktReqHandler(void* drvpriv, CsrWifiFsmEvent* msg)
ul_client_t *client;
CSR_SIGNAL signal;
CSR_MA_PACKET_INDICATION *pkt_ind;
- netInterface_priv_t *interfacePriv = priv->interfacePriv[req->interfaceTag];
+ netInterface_priv_t *interfacePriv;
+
+ if (priv == NULL) {
+ unifi_error(priv, "CsrWifiRouterCtrlWapiRxPktReq : invalid priv\n", __func__);
+ return;
+ }
+
+ if (priv->smepriv == NULL) {
+ unifi_error(priv, "CsrWifiRouterCtrlWapiRxPktReq : invalid sme priv\n", __func__);
+ return;
+ }
+
+ interfacePriv = priv->interfacePriv[req->interfaceTag];
if (CSR_WIFI_ROUTER_CTRL_MODE_STA == interfacePriv->interfaceMode) {
unifi_trace(priv, UDBG6, ">>%s\n", __FUNCTION__);
- if (priv == NULL) {
- unifi_error(priv, "CsrWifiRouterCtrlWapiRxPktReq : invalid priv\n",__FUNCTION__);
- return;
- }
-
- if (priv->smepriv == NULL) {
- unifi_error(priv, "CsrWifiRouterCtrlWapiRxPktReq : invalid sme priv\n",__FUNCTION__);
- return;
- }
if (req->dataLength == 0 || req->data == NULL) {
unifi_error(priv, "CsrWifiRouterCtrlWapiRxPktReq: invalid request\n",__FUNCTION__);
--
1.7.8.6
--
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