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fix possible buffer overflow

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Signed-off-by: Toni Uhlig <matzeton@googlemail.com>
This commit is contained in:
Toni Uhlig 2022-08-19 20:17:59 +02:00
parent fb8fe57bd8
commit c7ddee0409
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GPG Key ID: 22C5333D922537D2
1 changed files with 2 additions and 2 deletions
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4
probe.c
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@ -169,13 +169,13 @@ static int is_openvpn_protocol (const char*p,ssize_t len, struct sslhcfg_protoco
* whereas the packet id is increased with every transmitted datagram.
*/
if (len <= OVPN_HARD_RESET_PACKET_ID_OFFSET(OVPN_HMAC_128))
if (len <= OVPN_HARD_RESET_PACKET_ID_OFFSET(OVPN_HMAC_128) + 4)
return PROBE_NEXT;
if (ntohl(*(uint32_t*)(p + OVPN_HARD_RESET_PACKET_ID_OFFSET(OVPN_HMAC_128))) <= 5u)
return PROBE_MATCH;
if (len <= OVPN_HARD_RESET_PACKET_ID_OFFSET(OVPN_HMAC_160))
if (len <= OVPN_HARD_RESET_PACKET_ID_OFFSET(OVPN_HMAC_160) + 4)
return PROBE_NEXT;
if (ntohl(*(uint32_t*)(p + OVPN_HARD_RESET_PACKET_ID_OFFSET(OVPN_HMAC_160))) <= 5u)