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b43: Fix tim search buffer overrun
Use the length of the variable section of the beacon instead of the whole beacon length for bounds checking. Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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1 changed files with 4 additions and 3 deletions
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@ -1163,7 +1163,7 @@ static void b43_write_beacon_template(struct b43_wldev *dev,
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u16 ram_offset,
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u16 shm_size_offset, u8 rate)
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{
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int i, len;
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unsigned int i, len, variable_len;
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const struct ieee80211_mgmt *bcn;
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const u8 *ie;
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bool tim_found = 0;
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@ -1178,7 +1178,8 @@ static void b43_write_beacon_template(struct b43_wldev *dev,
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/* Find the position of the TIM and the DTIM_period value
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* and write them to SHM. */
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ie = bcn->u.beacon.variable;
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for (i = 0; i < len - 2; ) {
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variable_len = len - offsetof(struct ieee80211_mgmt, u.beacon.variable);
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for (i = 0; i < variable_len - 2; ) {
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uint8_t ie_id, ie_len;
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ie_id = ie[i];
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@ -1189,7 +1190,7 @@ static void b43_write_beacon_template(struct b43_wldev *dev,
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/* This is the TIM Information Element */
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/* Check whether the ie_len is in the beacon data range. */
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if (len < ie_len + 2 + i)
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if (variable_len < ie_len + 2 + i)
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break;
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/* A valid TIM is at least 4 bytes long. */
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if (ie_len < 4)
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