drivers/net/wireless/mwl8k.c: avoid use-after-free

Do not dereference p->station_id after kfree(cmd) because p
points into the cmd data structure.

Signed-off-by: Nickolai Zeldovich <nickolai@csail.mit.edu>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index f221b95b90b3..83564d36e801 100644
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -4250,9 +4250,11 @@ static int mwl8k_cmd_update_stadb_add(struct ieee80211_hw *hw,
         p->amsdu_enabled = 0;
 
         rc = mwl8k_post_cmd(hw, &cmd->header);
+        if (!rc)
+                rc = p->station_id;
         kfree(cmd);
 
-        return rc ? rc : p->station_id;
+        return rc;
 }
 
 static int mwl8k_cmd_update_stadb_del(struct ieee80211_hw *hw,