iwlegacy: off by one in iwl3945_hw_build_tx_cmd_rate()

We use "rate_index" like this:
	rate = iwl3945_rates[rate_index].plcp;
The iwl3945_rates[] array has IWL_RATE_COUNT_3945 elements so the
limit here is off by one.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/net/wireless/iwlegacy/3945.c b/drivers/net/wireless/iwlegacy/3945.c
index 863664f9ba8b..0b99deb48426 100644
--- a/drivers/net/wireless/iwlegacy/3945.c
+++ b/drivers/net/wireless/iwlegacy/3945.c
@@ -683,7 +683,7 @@ il3945_hw_build_tx_cmd_rate(struct il_priv *il, struct il_device_cmd *cmd,
                             struct ieee80211_hdr *hdr, int sta_id, int tx_id)
 {
         u16 hw_value = ieee80211_get_tx_rate(il->hw, info)->hw_value;
-        u16 rate_idx = min(hw_value & 0xffff, RATE_COUNT_3945);
+        u16 rate_idx = min(hw_value & 0xffff, RATE_COUNT_3945 - 1);
         u16 rate_mask;
         int rate;
         u8 rts_retry_limit;