iwlwifi: plug memory modified after free
In certain situations we saw a memory modified after free. This was tracked down to a pointer not NULLed after free and used in a different code path. It is unclear how the race happens pending further investigation but setting the pointer to NULL after free and adding a check in the 2nd code path handling the case gracefully helps for now. While here improve another debug messge in sta handling. Sponsored by: The FreeBSD Foundation MFC after: 3 days
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@ -506,6 +506,8 @@ static bool iwl_mvm_is_dup(struct ieee80211_sta *sta, int queue,
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return false;
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mvm_sta = iwl_mvm_sta_from_mac80211(sta);
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if (WARN_ON(mvm_sta->dup_data == NULL))
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return false;
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dup_data = &mvm_sta->dup_data[queue];
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/*
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@ -1734,8 +1734,8 @@ int iwl_mvm_drain_sta(struct iwl_mvm *mvm, struct iwl_mvm_sta *mvmsta,
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break;
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default:
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ret = -EIO;
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IWL_ERR(mvm, "Couldn't drain frames for staid %d\n",
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mvmsta->sta_id);
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IWL_ERR(mvm, "Couldn't drain frames for staid %d, status %#x\n",
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mvmsta->sta_id, status);
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break;
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}
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@ -1835,8 +1835,10 @@ int iwl_mvm_rm_sta(struct iwl_mvm *mvm,
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lockdep_assert_held(&mvm->mutex);
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if (iwl_mvm_has_new_rx_api(mvm))
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if (iwl_mvm_has_new_rx_api(mvm)) {
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kfree(mvm_sta->dup_data);
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mvm_sta->dup_data = NULL;
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}
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ret = iwl_mvm_drain_sta(mvm, mvm_sta, true);
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if (ret)
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