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iwlwifi: mvm: Drop large non sta frames 

In some buggy scenarios we could possible attempt to transmit frames larger
than maximum MSDU size. Since our devices don't know how to handle this,
it may result in asserts, hangs etc.
This can happen, for example, when we receive a large multicast frame
and try to transmit it back to the air in AP mode.
Since in a legal scenario this should never happen, drop such frames and
warn about it.

Signed-off-by: Andrei Otcheretianski <andrei.otcheretianski@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Andrei Otcheretianski 2019-04-15 16:45:04 +03:00 committed by Luca Coelho
parent 4fd445a2c8
commit ac70499ee9
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/intel/iwlwifi/mvm/tx.c
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@ -726,6 +726,9 @@ int iwl_mvm_tx_skb_non_sta(struct iwl_mvm *mvm, struct sk_buff *skb)
memcpy(&info, skb->cb, sizeof(info)); memcpy(&info, skb->cb, sizeof(info));
if (WARN_ON_ONCE(skb->len > IEEE80211_MAX_DATA_LEN + hdrlen))
return -1;
if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU)) if (WARN_ON_ONCE(info.flags & IEEE80211_TX_CTL_AMPDU))
return -1; return -1;