[PATCH 8/9] iwlagn: check beacon frame size

[Wey-Yi Guy <wey-yi.w.guy@intel.com>]

From: Johannes Berg <johannes.berg@intel.com>

When the beacon_skb is NULL, we might still
attempt to use it in this code path (if we
ever get here) -- make the code a bit more
defensive and check the return value of
iwl_fill_beacon_frame() against zero.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
---
 drivers/net/wireless/iwlwifi/iwl-agn.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-agn.c b/drivers/net/wireless/iwlwifi/iwl-agn.c
index 7079efb..c2636a7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-agn.c
+++ b/drivers/net/wireless/iwlwifi/iwl-agn.c
@@ -385,6 +385,8 @@ static unsigned int iwl_hw_get_beacon_cmd(struct iwl_priv *priv,
 				sizeof(frame->u) - sizeof(*tx_beacon_cmd));
 	if (WARN_ON_ONCE(frame_size > MAX_MPDU_SIZE))
 		return 0;
+	if (!frame_size)
+		return 0;
 
 	/* Set up TX command fields */
 	tx_beacon_cmd->tx.len = cpu_to_le16((u16)frame_size);
-- 
1.7.0.4