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F-5246 - Check IPv6 extension header fits before dereference in sniffer

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This commit is contained in:
aidan garske
2026-06-25 14:26:35 -07:00
parent 46edfa8997
commit 7ca965ab9f
1 changed files with 7 additions and 1 deletions
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src/sniffer.c
+7 -1
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@@ -2138,7 +2138,13 @@ static int CheckIp6Hdr(Ip6Hdr* iphdr, IpInfo* info, int length, char* error)
if (iphdr->next_header != TCP_PROTOCOL) {
Ip6ExtHdr* exthdr = (Ip6ExtHdr*)((byte*)iphdr + IP6_HDR_SZ);
do {
int hdrsz = (exthdr->length + 1) * 8;
int hdrsz;
/* make sure the extension header is fully present before reading */
if (length - exthdrsz < (int)sizeof(Ip6ExtHdr)) {
SetError(PACKET_HDR_SHORT_STR, error, NULL, 0);
return WOLFSSL_FATAL_ERROR;
}
hdrsz = (exthdr->length + 1) * 8;
if (hdrsz > length - exthdrsz) {
SetError(PACKET_HDR_SHORT_STR, error, NULL, 0);
return WOLFSSL_FATAL_ERROR;