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

[Nickolai Zeldovich]

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

Signed-off-by: Nickolai Zeldovich <nickolai@xxxxxxxxxxxxx>
---
 drivers/net/wireless/mwl8k.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index f221b95..83564d3 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,
-- 
1.7.10.4

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