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iwlagn: check beacon frame size

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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>
This commit is contained in:
Johannes Berg 2010-10-07 04:00:33 -07:00 committed by Wey-Yi Guy
parent 657e11a47d
commit 40bbfd4c1b
1 changed files with 2 additions and 0 deletions
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drivers/net/wireless/iwlwifi/iwl-agn.c
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@ -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);