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iwlwifi: pcie: check iwl_pcie_txq_build_tfd() return value

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If we use the iwl_pcie_txq_build_tfd() return value for BIT(),
we should validate that it's not going to be negative, so do
the check and bail out if we hit an error. We shouldn't, as
we check if it'll fit beforehand, but better be safe.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Johannes Berg 2018-06-18 09:53:36 +02:00 committed by Luca Coelho
parent e00b7b8b91
commit 6e00a2376f
1 changed files with 2 additions and 0 deletions
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2
drivers/net/wireless/intel/iwlwifi/pcie/tx.c
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@ -2013,6 +2013,8 @@ static int iwl_fill_data_tbs(struct iwl_trans *trans, struct sk_buff *skb,
return -EINVAL;
tb_idx = iwl_pcie_txq_build_tfd(trans, txq, tb_phys,
skb_frag_size(frag), false);
if (tb_idx < 0)
return tb_idx;
out_meta->tbs |= BIT(tb_idx);
}