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dhcp: fix memory corruption when LWIP_DHCP_MAX_DNS_SERVERS > DNS_MAX_SERVERS

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see patch #10124
This commit is contained in:
Simon Goldschmidt 2023-10-12 22:08:14 +02:00
parent b9ca1deba8
commit 1eeb70fbfa
1 changed files with 1 additions and 1 deletions
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2
src/core/ipv4/dhcp.c
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@ -1600,7 +1600,7 @@ again:
/* special case: there might be more than one server */ /* special case: there might be more than one server */
LWIP_DHCP_INPUT_ERROR("len %% 4 == 0", len % 4 == 0, return ERR_VAL;); LWIP_DHCP_INPUT_ERROR("len %% 4 == 0", len % 4 == 0, return ERR_VAL;);
/* limit number of DNS servers */ /* limit number of DNS servers */
decode_len = LWIP_MIN(len, 4 * DNS_MAX_SERVERS); decode_len = LWIP_MIN(len, 4 * LWIP_DHCP_PROVIDE_DNS_SERVERS);
LWIP_DHCP_INPUT_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;); LWIP_DHCP_INPUT_ERROR("len >= decode_len", len >= decode_len, return ERR_VAL;);
decode_idx = DHCP_OPTION_IDX_DNS_SERVER; decode_idx = DHCP_OPTION_IDX_DNS_SERVER;
break; break;