linux-kernel - [PATCH 3.12 006/175] iwlwifi: mvm: validate tid and sta_id in ba

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Message-Id: <9bb35f06515d463d4f1b384b9fc41c4e17cf69aa.1426581620.git.jslaby@suse.cz>
Date:	Tue, 17 Mar 2015 09:39:44 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Eyal Shapira <eyal@...ery.com>,
	Eyal Shapira <eyalx.shapira@...el.com>,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 006/175] iwlwifi: mvm: validate tid and sta_id in ba_notif

From: Eyal Shapira <eyal@...ery.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 2cee4762c528a9bd2cdff793197bf591a2196c11 upstream.

These are coming from the FW and are used to access arrays.
Bad values can cause an out of bounds access so discard
such ba_notifs and warn.

Signed-off-by: Eyal Shapira <eyalx.shapira@...el.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/wireless/iwlwifi/mvm/tx.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c b/drivers/net/wireless/iwlwifi/mvm/tx.c
index f41add9c8093..c95b4aac1317 100644
--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -832,6 +832,11 @@ int iwl_mvm_rx_ba_notif(struct iwl_mvm *mvm, struct iwl_rx_cmd_buffer *rxb,
 	sta_id = ba_notif->sta_id;
 	tid = ba_notif->tid;
 
+	if (WARN_ONCE(sta_id >= IWL_MVM_STATION_COUNT ||
+		      tid >= IWL_MAX_TID_COUNT,
+		      "sta_id %d tid %d", sta_id, tid))
+		return 0;
+
 	rcu_read_lock();
 
 	sta = rcu_dereference(mvm->fw_id_to_mac_id[sta_id]);
-- 
2.3.0

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