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ath9k: add compile time checking for the size of the channel list 

This prevents random memory corruption if the number of channels ever gets
changed without an update to the internal channel array size.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2010-10-09 02:39:30 +02:00 committed by John W. Linville
parent 8610c29a2c
commit cac4220b2e
2 changed files with 7 additions and 1 deletions
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4
drivers/net/wireless/ath/ath9k/hw.h
View File

@ -61,6 +61,8 @@
#define ATH9K_RSSI_BAD -128
#define ATH9K_NUM_CHANNELS 38
/* Register read/write primitives */
#define REG_WRITE(_ah, _reg, _val) \
ath9k_hw_common(_ah)->ops->write((_ah), (_val), (_reg))
@ -618,7 +620,7 @@ struct ath_hw {
struct ath9k_hw_version hw_version;
struct ath9k_ops_config config;
struct ath9k_hw_capabilities caps;
struct ath9k_channel channels[38];
struct ath9k_channel channels[ATH9K_NUM_CHANNELS];
struct ath9k_channel *curchan;
union {

4
drivers/net/wireless/ath/ath9k/init.c
View File

@ -481,6 +481,10 @@ static int ath9k_init_channels_rates(struct ath_softc *sc)
{
void *channels;
BUILD_BUG_ON(ARRAY_SIZE(ath9k_2ghz_chantable) +
ARRAY_SIZE(ath9k_5ghz_chantable) !=
ATH9K_NUM_CHANNELS);
if (test_bit(ATH9K_MODE_11G, sc->sc_ah->caps.wireless_modes)) {
channels = kmemdup(ath9k_2ghz_chantable,
sizeof(ath9k_2ghz_chantable), GFP_KERNEL);