net: mwifiex: fix a NULL pointer dereference

In case dev_alloc_skb fails, the fix returns -ENOMEM to avoid
NULL pointer dereference.

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/marvell/mwifiex/cmdevt.c b/drivers/net/wireless/marvell/mwifiex/cmdevt.c
index 60db2b9..8c35441 100644 (file)
--- a/drivers/net/wireless/marvell/mwifiex/cmdevt.c
+++ b/drivers/net/wireless/marvell/mwifiex/cmdevt.c
@@ -341,6 +341,12 @@ static int mwifiex_dnld_sleep_confirm_cmd(struct mwifiex_adapter *adapter)
                sleep_cfm_tmp =
                        dev_alloc_skb(sizeof(struct mwifiex_opt_sleep_confirm)
                                      + MWIFIEX_TYPE_LEN);
+               if (!sleep_cfm_tmp) {
+                       mwifiex_dbg(adapter, ERROR,
+                                   "SLEEP_CFM: dev_alloc_skb failed\n");
+                       return -ENOMEM;
+               }
+
                skb_put(sleep_cfm_tmp, sizeof(struct mwifiex_opt_sleep_confirm)
                        + MWIFIEX_TYPE_LEN);
                put_unaligned_le32(MWIFIEX_USB_TYPE_CMD, sleep_cfm_tmp->data);