linux-kernel - [PATCH v2] iwlwifi: out-of-bounds access in iwl_init_sband

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Message-Id: <1439543146-18938-1-git-send-email-adrien+dev@schischi.me>
Date:	Fri, 14 Aug 2015 11:05:46 +0200
From:	Adrien Schildknecht <adrien+dev@...ischi.me>
To:	johannes.berg@...el.com, emmanuel.grumbach@...el.com
Cc:	ilw@...ux.intel.com, kvalo@...eaurora.org,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Adrien Schildknecht <adrien+dev@...ischi.me>
Subject: [PATCH v2] iwlwifi: out-of-bounds access in iwl_init_sband_channels

KASan error report:
==================================================================
BUG: KASan: out of bounds access in iwl_init_sband_channels+0x207/0x260 [iwlwifi] at addr ffff8800c2d0aac8
Read of size 4 by task modprobe/329
==================================================================

Both loops of this function compare data from the 'chan' array and then
check if the index is valid.

The 2 conditions should be inverted to avoid an out-of-bounds access.

Signed-off-by: Adrien Schildknecht <adrien+dev@...ischi.me>
---
 drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c b/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c
index 21302b6..acc3d18 100644
--- a/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c
+++ b/drivers/net/wireless/iwlwifi/iwl-eeprom-parse.c
@@ -713,12 +713,12 @@ int iwl_init_sband_channels(struct iwl_nvm_data *data,
 	struct ieee80211_channel *chan = &data->channels[0];
 	int n = 0, idx = 0;
 
-	while (chan->band != band && idx < n_channels)
+	while (idx < n_channels && chan->band != band)
 		chan = &data->channels[++idx];
 
 	sband->channels = &data->channels[idx];
 
-	while (chan->band == band && idx < n_channels) {
+	while (idx < n_channels && chan->band == band) {
 		chan = &data->channels[++idx];
 		n++;
 	}
-- 
2.5.0

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