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uhcp: check maximum for prefix length

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Martine Lenders 2020-12-09 17:26:38 +01:00
parent 1477a340fe
commit 44a94dd91e
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GPG Key ID: CCD317364F63286F
1 changed files with 3 additions and 2 deletions
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5
sys/net/application_layer/uhcp/uhcp.c
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@ -98,8 +98,9 @@ void uhcp_handle_push(uhcp_push_t *req, uint8_t *src, uint16_t port, uhcp_iface_
char prefix_str[INET6_ADDRSTRLEN]; char prefix_str[INET6_ADDRSTRLEN];
inet_ntop(AF_INET6, src, addr_str, INET6_ADDRSTRLEN); inet_ntop(AF_INET6, src, addr_str, INET6_ADDRSTRLEN);
uint8_t prefix[IN6ADDRSZ] = { 0 }; uint8_t prefix[IN6ADDRSZ] = { 0 };
if (req->prefix_len == 0) { /* prefix_len can't be 0 or greater then IN6ADDRSZ * 8 (== 128) */
LOG_ERROR("uhcp_handle_push(): prefix length 0\n"); if ((req->prefix_len == 0) || (req->prefix_len > (IN6ADDRSZ << 3))) {
LOG_ERROR("uhcp_handle_push(): invalid prefix length\n");
return; return;
} }
size_t prefix_bytes = (req->prefix_len + 7)>>3; size_t prefix_bytes = (req->prefix_len + 7)>>3;