Revert "libertas: Read buffer overflow"

This reverts commit 57921c312e8cef72ba35a4cfe870b376da0b1b87.

On request from John Linville:

	It has been shown to create a new problem.  There is work
	towards a solution to that one, but it isn't a simple
	clean-up.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 8 deletions

diff --git a/drivers/net/wireless/libertas/assoc.c b/drivers/net/wireless/libertas/assoc.c
index d6997371c27..b9b37411903 100644
--- a/drivers/net/wireless/libertas/assoc.c
+++ b/drivers/net/wireless/libertas/assoc.c
@@ -1,7 +1,6 @@
 /* Copyright (C) 2006, Red Hat, Inc. */
 
 #include <linux/types.h>
-#include <linux/kernel.h>
 #include <linux/etherdevice.h>
 #include <linux/ieee80211.h>
 #include <linux/if_arp.h>
@@ -44,21 +43,21 @@ static int get_common_rates(struct lbs_private *priv,
         u16 *rates_size)
 {
         u8 *card_rates = lbs_bg_rates;
+        size_t num_card_rates = sizeof(lbs_bg_rates);
         int ret = 0, i, j;
-        u8 tmp[(ARRAY_SIZE(lbs_bg_rates) - 1) * (*rates_size - 1)];
+        u8 tmp[30];
         size_t tmp_size = 0;
 
         /* For each rate in card_rates that exists in rate1, copy to tmp */
-        for (i = 0; i < ARRAY_SIZE(lbs_bg_rates) && card_rates[i]; i++) {
-                for (j = 0; j < *rates_size && rates[j]; j++) {
+        for (i = 0; card_rates[i] && (i < num_card_rates); i++) {
+                for (j = 0; rates[j] && (j < *rates_size); j++) {
                         if (rates[j] == card_rates[i])
                                 tmp[tmp_size++] = card_rates[i];
                 }
         }
 
         lbs_deb_hex(LBS_DEB_JOIN, "AP rates    ", rates, *rates_size);
-        lbs_deb_hex(LBS_DEB_JOIN, "card rates  ", card_rates,
-                        ARRAY_SIZE(lbs_bg_rates));
+        lbs_deb_hex(LBS_DEB_JOIN, "card rates  ", card_rates, num_card_rates);
         lbs_deb_hex(LBS_DEB_JOIN, "common rates", tmp, tmp_size);
         lbs_deb_join("TX data rate 0x%02x\n", priv->cur_rate);
 
@@ -70,7 +69,10 @@ static int get_common_rates(struct lbs_private *priv,
                 lbs_pr_alert("Previously set fixed data rate %#x isn't "
                        "compatible with the network.\n", priv->cur_rate);
                 ret = -1;
+                goto done;
         }
+        ret = 0;
+
 done:
         memset(rates, 0, *rates_size);
         *rates_size = min_t(int, tmp_size, *rates_size);
@@ -320,7 +322,7 @@ static int lbs_associate(struct lbs_private *priv,
         rates = (struct mrvl_ie_rates_param_set *) pos;
         rates->header.type = cpu_to_le16(TLV_TYPE_RATES);
         memcpy(&rates->rates, &bss->rates, MAX_RATES);
-        tmplen = min_t(u16, ARRAY_SIZE(rates->rates), MAX_RATES);
+        tmplen = MAX_RATES;
         if (get_common_rates(priv, rates->rates, &tmplen)) {
                 ret = -1;
                 goto done;
@@ -596,7 +598,7 @@ static int lbs_adhoc_join(struct lbs_private *priv,
 
         /* Copy Data rates from the rates recorded in scan response */
         memset(cmd.bss.rates, 0, sizeof(cmd.bss.rates));
-        ratesize = min_t(u16, ARRAY_SIZE(cmd.bss.rates), MAX_RATES);
+        ratesize = min_t(u16, sizeof(cmd.bss.rates), MAX_RATES);
         memcpy(cmd.bss.rates, bss->rates, ratesize);
         if (get_common_rates(priv, cmd.bss.rates, &ratesize)) {
                 lbs_deb_join("ADHOC_JOIN: get_common_rates returned error.\n");