[PATCH][next] rsi: fix missing null pointer check from a failed ieee80211_probereq_get call

[Colin King]

From: Colin Ian King <colin.k...@canonical.com>

The call to ieee80211_probereq_get can return NULL if a skb allocation
fails, so add a null pointer check and free an earlier skb on the error
exit return path.

Fixes: 7fdcb8e12660 ("rsi: add support for hardware scan offload")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
---
 drivers/net/wireless/rsi/rsi_91x_mgmt.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/rsi/rsi_91x_mgmt.c 
b/drivers/net/wireless/rsi/rsi_91x_mgmt.c
index 8c17842ac507..844f2fac298f 100644
--- a/drivers/net/wireless/rsi/rsi_91x_mgmt.c
+++ b/drivers/net/wireless/rsi/rsi_91x_mgmt.c
@@ -1726,6 +1726,10 @@ int rsi_send_bgscan_probe_req(struct rsi_common *common,
 
        probereq_skb = ieee80211_probereq_get(common->priv->hw, vif->addr, ssid,
                                              ssid_len, scan_req->ie_len);
+       if (!probereq_skb) {
+               dev_kfree_skb(skb);
+               return -ENOMEM;
+       }
 
        memcpy(&skb->data[frame_len], probereq_skb->data, probereq_skb->len);
 
-- 
2.20.1