Use the length of the variable section of the beacon instead of the
whole beacon length for bounds checking.
Signed-off-by: Michael Buesch <[EMAIL PROTECTED]>
Index: wireless-2.6/drivers/net/wireless/b43/main.c
===================================================================
--- wireless-2.6.orig/drivers/net/wireless/b43/main.c 2007-12-26
18:20:38.000000000 +0100
+++ wireless-2.6/drivers/net/wireless/b43/main.c 2007-12-27
22:05:07.000000000 +0100
@@ -1161,7 +1161,7 @@ static void b43_write_beacon_template(st
u16 ram_offset,
u16 shm_size_offset, u8 rate)
{
- int i, len;
+ unsigned int i, len, variable_len;
const struct ieee80211_mgmt *bcn;
const u8 *ie;
bool tim_found = 0;
@@ -1176,7 +1176,8 @@ static void b43_write_beacon_template(st
/* Find the position of the TIM and the DTIM_period value
* and write them to SHM. */
ie = bcn->u.beacon.variable;
- for (i = 0; i < len - 2; ) {
+ variable_len = len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
+ for (i = 0; i < variable_len - 2; ) {
uint8_t ie_id, ie_len;
ie_id = ie[i];
@@ -1187,7 +1188,7 @@ static void b43_write_beacon_template(st
/* This is the TIM Information Element */
/* Check whether the ie_len is in the beacon data
range. */
- if (len < ie_len + 2 + i)
+ if (variable_len < ie_len + 2 + i)
break;
/* A valid TIM is at least 4 bytes long. */
if (ie_len < 4)
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