[PATCH v2] iwlwifi: out-of-bounds access in iwl_init_sband_channels

[Adrien Schildknecht]

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@xxxxxxxxxxx>
---
 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/