NET: ath5k, check ath5k_eeprom_mode_from_channel retval

It can, if invalid argument given, return a negative value. In that
case we would access arrays out-of-bounds and such. Check the value
and yell loudly if that happened as it would be a bug in the
implementation. (Instead of silently corrupting memory.)

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Nick Kossifidis <mickflemm@gmail.com>
Cc: "Luis R. Rodriguez" <mcgrof@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/ath/ath5k/phy.c b/drivers/net/wireless/ath/ath5k/phy.c
index ab363f3..a78afa9 100644 (file)
--- a/drivers/net/wireless/ath/ath5k/phy.c
+++ b/drivers/net/wireless/ath/ath5k/phy.c
@@ -1613,6 +1613,10 @@ ath5k_hw_update_noise_floor(struct ath5k_hw *ah)
        ah->ah_cal_mask |= AR5K_CALIBRATION_NF;
 
        ee_mode = ath5k_eeprom_mode_from_channel(ah->ah_current_channel);
+       if (WARN_ON(ee_mode < 0)) {
+               ah->ah_cal_mask &= ~AR5K_CALIBRATION_NF;
+               return;
+       }
 
        /* completed NF calibration, test threshold */
        nf = ath5k_hw_read_measured_noise_floor(ah);

diff --git a/drivers/net/wireless/ath/ath5k/reset.c b/drivers/net/wireless/ath/ath5k/reset.c
index 4084b10..e2d8b2c 100644 (file)
--- a/drivers/net/wireless/ath/ath5k/reset.c
+++ b/drivers/net/wireless/ath/ath5k/reset.c
@@ -985,6 +985,8 @@ ath5k_hw_commit_eeprom_settings(struct ath5k_hw *ah,
                return;
 
        ee_mode = ath5k_eeprom_mode_from_channel(channel);
+       if (WARN_ON(ee_mode < 0))
+               return;
 
        /* Adjust power delta for channel 14 */
        if (channel->center_freq == 2484)