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Commit 57921c31 authored by Roel Kluin's avatar Roel Kluin Committed by John W. Linville
Browse files

libertas: Read buffer overflow 



Several arrays were read before checking whether the index was within
bounds. ARRAY_SIZE() should be used to determine the size of arrays.

rates->rates has an arraysize of 1, so calling get_common_rates()
with a rates_size of MAX_RATES (14) was causing reads out of bounds.

tmp_size can increment at most to (ARRAY_SIZE(lbs_bg_rates) - 1) *
(*rates_size - 1), so that should be the number of elements of tmp[].

A goto can be eliminated: ret was already set upon its declaration.

Signed-off-by: default avatarRoel Kluin <roel.kluin@gmail.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 430453fc

drivers/net/wireless/libertas/assoc.c

+8 −10
Original line number Diff line number Diff line 
/* 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>
@@ -43,21 +44,21 @@ 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[30];

	u8 tmp[(ARRAY_SIZE(lbs_bg_rates) - 1) * (*rates_size - 1)];

	size_t tmp_size = 0;



	/* For each rate in card_rates that exists in rate1, copy to tmp */

	for (i = 0; card_rates[i] && (i < num_card_rates); i++) {

		for (j = 0; rates[j] && (j < *rates_size); j++) {

	for (i = 0; i < ARRAY_SIZE(lbs_bg_rates) && card_rates[i]; i++) {

		for (j = 0; j < *rates_size && rates[j]; 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, num_card_rates);

	lbs_deb_hex(LBS_DEB_JOIN, "card rates  ", card_rates,

			ARRAY_SIZE(lbs_bg_rates));

	lbs_deb_hex(LBS_DEB_JOIN, "common rates", tmp, tmp_size);

	lbs_deb_join("TX data rate 0x%02x\n", priv->cur_rate);
@@ -69,10 +70,7 @@ 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);
@@ -322,7 +320,7 @@ 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 = MAX_RATES;

	tmplen = min_t(u16, ARRAY_SIZE(rates->rates), MAX_RATES);

	if (get_common_rates(priv, rates->rates, &tmplen)) {

		ret = -1;

		goto done;
@@ -598,7 +596,7 @@ 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, sizeof(cmd.bss.rates), MAX_RATES);

	ratesize = min_t(u16, ARRAY_SIZE(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");