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fix TCP opt parser

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Sergio R. Caprile committed 2026-07-14 10:29:43 -03:00
1 parent 7a2a3fc136
commit cc7c6d2d18
2 files changed
+6 -6
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mongoose.c
+3 -3
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@@ -9415,9 +9415,9 @@ static bool handle_opt(struct connstate *s, struct tcp *tcp, bool ip6) {
s->dmss = ip6 ? 1220 : 536; // assume default, RFC-9293 3.7.1
while (len > 0) { // RFC-9293 3.1 3.2
uint8_t kind = opts[0], optlen = 1;
if (kind != 1) { // No-Operation
if (kind == 0) break; // End of Option List
if (len < 2 || opts[1] == 0) return false; // Malformed options
if (kind != 1) { // No-Operation
if (kind == 0) break; // End of Option List
if (len < 2 || opts[1] == 0 || opts[1] > len) return false; // Malformed
optlen = opts[1];
if (kind == 2 && optlen == 4) // set received MSS
s->dmss = (uint16_t) (((uint16_t) opts[2] << 8) + opts[3]);
src/net_builtin.c
+3 -3
View File
@@ -1588,9 +1588,9 @@ static bool handle_opt(struct connstate *s, struct tcp *tcp, bool ip6) {
s->dmss = ip6 ? 1220 : 536; // assume default, RFC-9293 3.7.1
while (len > 0) { // RFC-9293 3.1 3.2
uint8_t kind = opts[0], optlen = 1;
if (kind != 1) { // No-Operation
if (kind == 0) break; // End of Option List
if (len < 2 || opts[1] == 0) return false; // Malformed options
if (kind != 1) { // No-Operation
if (kind == 0) break; // End of Option List
if (len < 2 || opts[1] == 0 || opts[1] > len) return false; // Malformed
optlen = opts[1];
if (kind == 2 && optlen == 4) // set received MSS
s->dmss = (uint16_t) (((uint16_t) opts[2] << 8) + opts[3]);