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P2P: Fix validation on Invitation Request error path

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It was possible for the error path to try to use P2P Group ID attribute
even if one was not included in the message. This could result in
dereferencing a NULL pointer, so re-check the pointer before copying the
data.

Signed-off-by: Jouni Malinen <j@w1.fi>
This commit is contained in:
Jouni Malinen 2014-03-02 02:06:06 +02:00
parent ca412c7a38
commit fa72a880ed
1 changed files with 10 additions and 5 deletions
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15
src/p2p/p2p_invitation.c
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@ -359,12 +359,17 @@ fail:
p2p->inv_group_bssid_ptr = p2p->inv_group_bssid; p2p->inv_group_bssid_ptr = p2p->inv_group_bssid;
} else } else
p2p->inv_group_bssid_ptr = NULL; p2p->inv_group_bssid_ptr = NULL;
if (msg.group_id_len - ETH_ALEN <= 32) { if (msg.group_id) {
os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN, if (msg.group_id_len - ETH_ALEN <= 32) {
msg.group_id_len - ETH_ALEN); os_memcpy(p2p->inv_ssid, msg.group_id + ETH_ALEN,
p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN; msg.group_id_len - ETH_ALEN);
p2p->inv_ssid_len = msg.group_id_len - ETH_ALEN;
}
os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
} else {
p2p->inv_ssid_len = 0;
os_memset(p2p->inv_go_dev_addr, 0, ETH_ALEN);
} }
os_memcpy(p2p->inv_go_dev_addr, msg.group_id, ETH_ALEN);
p2p->inv_status = status; p2p->inv_status = status;
p2p->inv_op_freq = op_freq; p2p->inv_op_freq = op_freq;